CN113299242A - Pixel circuit, driving method and display device - Google Patents
Pixel circuit, driving method and display device Download PDFInfo
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- CN113299242A CN113299242A CN202110566255.4A CN202110566255A CN113299242A CN 113299242 A CN113299242 A CN 113299242A CN 202110566255 A CN202110566255 A CN 202110566255A CN 113299242 A CN113299242 A CN 113299242A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3258—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the voltage across the light-emitting element
Abstract
The invention provides a pixel circuit, a driving method and a display device. The pixel circuit comprises a light-emitting element, a driving circuit, a first light-emitting control circuit and a first initialization circuit; the first light-emitting control circuit controls the connection or disconnection between the driving circuit and the first pole of the light-emitting element under the control of the light-emitting control signal; the first initializing circuit controls disconnection between the first initializing voltage line and the first pole of the light emitting element when the first light emitting control circuit controls connection between the driving circuit and the first pole of the light emitting element under control of the first initializing control signal, and controls the first initializing voltage line to write the first initializing voltage to the first pole of the light emitting element while the first light emitting control circuit controls disconnection between the driving circuit and the first pole of the light emitting element, the first initializing circuit being kept in a conducting state under control of the first initializing control signal. The embodiment of the invention can effectively reduce the lateral electric leakage and improve the low-gray-scale damage phenomenon.
Description
Technical Field
The present invention relates to the field, and in particular, to a pixel circuit, a driving method, and a display device.
Background
The high purity of an AMOLED (active matrix organic light emitting diode) display device in low gray scale display is one of its significant advantages over an LCD (liquid crystal display). The AMOLED display device includes an Anode (Anode), a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, an electron injection layer, a Cathode (Cathode), and the like. Because the hole injection layer and the transmission layer can transmit charges, when a certain pixel emits light, the charges can enter an adjacent pixel through the hole injection layer and the transmission layer, and accordingly an anode in the adjacent pixel leaks electricity through the conductive layer, and the phenomenon is Lateral Leakage (Lateral Leakage). In low Gray scale, the pixels are difficult to turn on when in dot monochrome picture due to mutual leakage between the pixels, resulting in low Gray scale picture loss, which is called low Gray scale damage (Gray scratching). Gray scraping is one of the main methods for evaluating Lateral leak.
Disclosure of Invention
The invention mainly aims to provide a pixel circuit, a driving method and a display device, and solves the problem that the existing display device cannot effectively reduce lateral electric leakage, so that the low gray scale damage phenomenon is caused.
The embodiment of the invention provides a pixel circuit, which comprises a light-emitting element, a driving circuit, a first light-emitting control circuit and a first initialization circuit, wherein the first initialization circuit is used for initializing the light-emitting element;
the drive circuit is used for generating drive current under the control of the potential of the control end of the drive circuit;
the first light-emitting control circuit is respectively electrically connected with a light-emitting control line, the driving circuit and a first pole of the light-emitting element and is used for controlling the connection or disconnection between the driving circuit and the first pole of the light-emitting element under the control of a light-emitting control signal provided by the light-emitting control line;
the first initialization circuit is electrically connected to a first initialization control line, a first pole of the light emitting element, and a first initialization voltage line, respectively, and is configured to control disconnection between the first initialization voltage line and the first pole of the light emitting element under control of a first initialization control signal provided by the first initialization control line when the first light emitting control circuit controls connection between the driving circuit and the first pole of the light emitting element, and to maintain a conducting state under control of the first initialization control signal and control the first initialization voltage line to write a first initialization voltage to the first pole of the light emitting element when the first light emitting control circuit controls disconnection between the driving circuit and the first pole of the light emitting element.
Optionally, the first initialization circuit includes a first transistor;
a control electrode of the first transistor is electrically connected to the first initial control line, a first electrode of the first transistor is connected to the first initial voltage line, and a second electrode of the first transistor is electrically connected to the first electrode of the light emitting element.
Optionally, the first lighting control circuit includes a second transistor;
a control electrode of the second transistor is electrically connected to the light-emitting control line, a first electrode of the second transistor is electrically connected to the driving circuit, and a second electrode of the second transistor is electrically connected to the first electrode of the light-emitting element.
Optionally, the first initial control line is formed by a first gate metal layer, and the first initial voltage line is formed by a second gate metal layer;
the first transistor comprises a first active pattern, wherein the first active pattern comprises a first conductive part, a first channel part and a second conductive part which are sequentially arranged along a first direction; the first conductive portion serves as a first pole of the first transistor, and the second conductive portion serves as a second pole of the first transistor;
the first initial voltage wire is electrically connected with a first conductive connecting part through a first through hole, and the first conductive connecting part is formed on the source drain metal layer;
the first conductive connection part is electrically connected to the second conductive part through a second via hole so that the first preliminary voltage line is electrically connected to the second pole of the first transistor.
Optionally, the pixel circuit according to at least one embodiment of the present invention further includes a driving circuit, a second initialization circuit, a data writing circuit, a second light-emitting control circuit, a compensation control circuit, and an energy storage circuit;
the second initialization circuit is respectively electrically connected with a second initial control line, a second initial voltage line and the control end of the driving circuit, and is used for writing a second initial voltage provided by the second initial voltage line into the control end of the driving circuit under the control of a second initial control signal provided by the second initial control line;
the data writing circuit is respectively electrically connected with the scanning line, the data line and the first end of the driving circuit and is used for writing the data voltage on the data line into the first end of the driving circuit under the control of the scanning signal provided by the scanning line;
the second light-emitting control circuit is respectively electrically connected with a light-emitting control line, a first voltage end and the first end of the driving circuit and is used for controlling the first voltage end to be communicated with the first end of the driving circuit under the control of the light-emitting control signal;
the compensation control circuit is respectively electrically connected with the scanning line, the control end of the driving circuit and the second end of the driving circuit and is used for controlling the communication between the control end of the driving circuit and the second end of the driving circuit under the control of the scanning signal;
the energy storage circuit is electrically connected with the control end of the driving circuit and is used for storing electric energy;
and the second pole of the light-emitting element is electrically connected with the second voltage end.
Optionally, the first initialization circuit includes a first transistor;
the second pole of the first transistor is electrically connected with the second end of the driving circuit.
Optionally, the driving circuit includes a driving transistor, the second initialization circuit includes a third transistor, the data writing circuit includes a fourth transistor, the second emission control circuit includes a fifth transistor, the compensation control circuit includes a sixth transistor, and the tank circuit includes a storage capacitor;
a control electrode of the third transistor is electrically connected to the second initialization control line, a first electrode of the third transistor is electrically connected to the second initialization voltage line, and a second electrode of the third transistor is electrically connected to the control electrode of the driving transistor;
a control electrode of the fourth transistor is electrically connected with the scanning line, a first electrode of the fourth transistor is electrically connected with the data line, and a second electrode of the fourth transistor is electrically connected with the first electrode of the driving transistor;
a control electrode of the fifth transistor is electrically connected to the light emission control line, a first electrode of the fifth transistor is electrically connected to the first voltage terminal, and a second electrode of the fifth transistor is electrically connected to the first electrode of the driving transistor;
a control electrode of the sixth transistor is electrically connected with the scanning line, a first electrode of the sixth transistor is electrically connected with the control electrode of the driving transistor, and a second electrode of the sixth transistor is electrically connected with the second electrode of the driving transistor;
the first electrode plate of the storage capacitor is electrically connected with the control electrode of the driving transistor, and the second electrode plate of the storage capacitor is electrically connected with the first voltage end.
The invention also provides a driving method applied to the pixel circuit, and the driving method comprises the following steps:
when the first light-emitting control circuit controls the connection between the driving circuit and the first pole of the light-emitting element, the first initialization circuit controls to disconnect the first initial voltage line from the first pole of the light-emitting element under the control of a first initial control signal provided by a first initial control line;
and the first initialization circuit keeps a conducting state under the control of the first initialization control signal and controls the first initialization voltage line to write the first initialization voltage into the first pole of the light-emitting element when the first light-emitting control circuit controls the drive circuit to be disconnected from the first pole of the light-emitting element.
The invention also provides a display device which comprises the pixel circuit.
Optionally, the first initial voltage applied to all the pixel circuits included in the display device is the same.
The pixel circuit, the driving method and the display device provided by the embodiment of the invention effectively reduce the lateral electric leakage and improve the low-gray-scale damage phenomenon.
Drawings
Fig. 1 is a structural diagram of a pixel circuit according to an embodiment of the present invention;
FIG. 2 is a block diagram of a pixel circuit according to at least one embodiment of the invention;
FIG. 3 is a circuit diagram of a pixel circuit according to at least one embodiment of the invention;
FIG. 4 is a timing diagram illustrating operation of at least one embodiment of the pixel circuit shown in FIG. 3 according to the present invention;
FIG. 5 is a schematic diagram of the electrodes of the transistor and the plates of the capacitor where indicated on the basis of FIG. 3;
FIG. 6 is a block diagram of an active layer in a pixel circuit according to at least one embodiment of the invention;
FIG. 7 is a diagram illustrating a structure of a first gate metal layer in a pixel circuit according to at least one embodiment of the invention;
FIG. 8 is a diagram illustrating a second gate metal layer in a pixel circuit according to at least one embodiment of the invention;
fig. 9 is a structural diagram of a source drain metal layer in a pixel circuit according to at least one embodiment of the present disclosure;
fig. 10 is a layout diagram of a pixel circuit according to at least one embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 transistors used in all embodiments of the present invention may be transistors, thin film transistors, or field effect transistors or other devices with the same characteristics. In the embodiment of the present invention, in order to distinguish 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 practical operation, when the transistor is a triode, the control electrode may be a base electrode, the first electrode may be a collector electrode, and the second electrode may be an emitter electrode; alternatively, the control electrode may be a base electrode, the first electrode may be an emitter electrode, and the second electrode may be a collector electrode.
In practical operation, when the transistor is a thin film transistor or a field effect transistor, the control electrode may be a gate electrode, the first electrode may be a drain electrode, and the second electrode may be a source electrode; alternatively, the control electrode may be a gate electrode, the first electrode may be a source electrode, and the second electrode may be a drain electrode.
As shown in fig. 1, the pixel circuit according to the embodiment of the present invention includes a light emitting element E1, a driving circuit 10, a first light emission control circuit 11, and a first initialization circuit 12;
the driving circuit 10 is used for generating a driving current under the control of the potential of the control end thereof;
the first light-emitting control circuit 11 is electrically connected to the light-emitting control line EM, the driving circuit 10 and the first pole of the light-emitting element E1 respectively, and is used for controlling the connection or disconnection between the driving circuit 10 and the first pole of the light-emitting element E1 under the control of a light-emitting control signal provided by the light-emitting control line EM;
the first initializing circuit 12 is electrically connected to the first initializing control line AR, the first pole of the light emitting element E1 and the first initializing voltage line I1, respectively, and is configured to control disconnection between the first initializing voltage line I1 and the first pole of the light emitting element E1 when the first lighting control circuit 11 controls the connection between the driving circuit 10 and the first pole of the light emitting element E1 under the control of a first initializing control signal provided by the first initializing control line AR, and to maintain a conducting state under the control of the first initializing control signal and control the first initializing voltage line I1 to write a first initializing voltage to the first pole of the light emitting element E1 when the first lighting control circuit 11 controls the connection between the driving circuit 10 and the first pole of the light emitting element E1.
In the embodiment shown in FIG. 1, light emitting node N0 is a node electrically connected to a first pole of light emitting element E1.
In at least one embodiment of the present invention, the light emitting element may be an organic light emitting diode, the first pole of the light emitting element may be an anode of the organic light emitting diode, and the second pole of the light emitting element may be a cathode of the organic light emitting diode.
When the pixel circuit according to the embodiment of the present invention is in operation, in a light emitting phase, the first light emitting control circuit 11 controls the driving circuit 10 to be connected to the first pole of the light emitting element E1, and the first initialization circuit 12 controls to disconnect the first initialization voltage line I1 from the first pole of the light emitting element E1 under the control of the first initialization control signal provided by the first initialization control line AR; in a non-light emitting period, when the first light emitting control circuit 11 controls the driving circuit 10 to be disconnected from the first pole of the light emitting element E1, the first initializing circuit 12 maintains a conducting state under the control of the first initializing control signal, and the first initializing circuit 12 controls the first initializing voltage line I1 to write the first initializing voltage to the first pole of the light emitting element E1. In the non-light emitting stage, the voltage difference of the first electrode of the light emitting element E1 in different pixel circuits included in the display device is reduced by the first initialization circuit 12, so that the lateral leakage is effectively reduced, and the low gray scale damage phenomenon is improved.
In the related art, the green pixel circuit and the blue pixel circuit leak electricity to the red pixel circuit more, Gray scraping (low Gray scale damage) of the red pixel circuit performs the worst, and the green pixel circuit follows.
The necessary condition for the leakage between the pixel circuits is to have a conductive path and a voltage difference between the light emitting nodes N0 in the different pixel circuits. Because the voltages of the light-emitting nodes of the red pixel circuit, the green pixel circuit and the blue pixel circuit are different in the light-emitting stage, the voltage difference between the light-emitting nodes of the pixel circuits in the non-light-emitting stage can be reduced, so that the lateral electric leakage is effectively reduced, the phenomenon that the light-emitting nodes are difficult to turn on when a point monochromatic picture is lighted due to the electric leakage among the pixels under a low gray scale is avoided, the loss of the low gray scale picture is avoided, and the effect of displaying the picture with high quality is achieved.
Optionally, the first initialization circuit includes a first transistor;
a control electrode of the first transistor is electrically connected to the first initial control line, a first electrode of the first transistor is electrically connected to the first initial voltage line, and a second electrode of the first transistor is electrically connected to the first electrode of the light emitting element.
Optionally, the first lighting control circuit includes a second transistor;
a control electrode of the second transistor is electrically connected to the light-emitting control line, a first electrode of the second transistor is electrically connected to the driving circuit, and a second electrode of the second transistor is electrically connected to the first electrode of the light-emitting element.
As shown in fig. 2, on the basis of the embodiment of the pixel circuit shown in fig. 1, the pixel circuit according to at least one embodiment of the present invention may further include a second initialization circuit 22, a data writing circuit 23, a second light-emitting control circuit 24, a compensation control circuit 25, and a tank circuit 26;
the second initialization circuit 22 is electrically connected to the second initialization control line SCAN (N-1), the second initialization voltage line I2 and the control terminal of the driving circuit 10, respectively, and is configured to write the second initialization voltage supplied from the second initialization voltage line I2 into the control terminal of the driving circuit 10 under the control of a second initialization control signal supplied from the second initialization control line SCAN (N-1);
the Data writing circuit 23 is electrically connected to the SCAN line SCAN, the Data line Data and the first end of the driving circuit 10, and is configured to write the Data voltage on the Data line Data into the first end of the driving circuit 10 under the control of the SCAN signal provided by the SCAN line SCAN;
the second light-emitting control circuit 24 is electrically connected to a light-emitting control line EM, a first voltage terminal V1 and the first terminal of the driving circuit 10, respectively, and is configured to control the communication between the first voltage terminal V1 and the first terminal of the driving circuit 10 under the control of the light-emitting control signal;
the compensation control circuit 25 is electrically connected to the SCAN line SCAN, the control end of the driving circuit 10 and the second end of the driving circuit 10, respectively, and is configured to control the communication between the control end of the driving circuit 10 and the second end of the driving circuit 10 under the control of the SCAN signal;
the energy storage circuit 26 is electrically connected with the control end of the driving circuit 10 and is used for storing electric energy;
the second pole of the light emitting element E1 is electrically connected to the second voltage terminal V2.
In a specific implementation, the first voltage terminal may be a high voltage terminal, and the second voltage terminal may be a low voltage terminal.
Optionally, the first initial voltage and the second initial voltage are the same or different.
When at least one embodiment of the pixel circuit shown in fig. 2 is in operation, the display period may include an initialization phase, a data writing phase, and a light emitting phase, which are sequentially set;
in the initialization phase, the first light emission control circuit 11 controls the driving circuit 10 to be disconnected from the first pole of the light emitting element E1 under the control of the light emission control signal provided by the light emission control line EM; the second light-emitting control circuit 24 controls the first voltage terminal V1 to be disconnected from the first terminal of the driving circuit 10 under the control of the light-emitting control signal; the first initialization circuit 12 controls the first initialization voltage line I1 to write the first initialization voltage to the first pole of the light emitting element E1 under the control of a first initialization control signal supplied from a first initialization control line AR, and the second initialization circuit 22 writes the second initialization voltage supplied from a second initialization voltage line I2 to the control terminal of the driving circuit 10 under the control of a second initialization control signal supplied from a second initialization control line SCAN (N-1);
in the data writing phase, the first light emission control circuit 11 controls the driving circuit 10 to be disconnected from the first pole of the light emitting element E1 under the control of the light emission control signal supplied from the light emission control line EM; the second light-emitting control circuit 24 controls the first voltage terminal V1 to be disconnected from the first terminal of the driving circuit 10 under the control of the light-emitting control signal; the first initializing circuit 12 controls the first initializing voltage line I1 to write a first initializing voltage to the first pole of the light emitting element E1 under the control of a first initializing control signal supplied from a first initializing control line AR, and the Data writing circuit 23 writes the Data voltage on the Data line Data to the first end of the driving circuit 10 under the control of a SCAN signal supplied from the SCAN line SCAN; the compensation control circuit 25 controls the communication between the control end of the driving circuit 10 and the second end of the driving circuit 10 under the control of the scanning signal;
in the light emitting phase, the first light emitting control circuit 11 controls the communication between the driving circuit 10 and the first pole of the light emitting element E1 under the control of the light emitting control signal provided by the light emitting control line EM; the second light-emitting control circuit 24 controls the first voltage end V1 to be communicated with the first end of the driving circuit 10 under the control of the light-emitting control signal; the first initializing circuit 12 controls the first initializing voltage line I1 to be disconnected from the first pole of the light emitting element E1 under the control of the first initializing control signal supplied from the first initializing control line AR; the drive circuit 10 generates a drive current for driving the light emitting element E1 to emit light under the control of the potential of the control terminal thereof.
In a specific implementation, when the first initialization circuit includes a first transistor, the second pole of the first transistor is electrically connected to the second terminal of the driving circuit.
Optionally, the driving circuit includes a driving transistor, the second initialization circuit includes a third transistor, the data writing circuit includes a fourth transistor, the second emission control circuit includes a fifth transistor, the compensation control circuit includes a sixth transistor, and the tank circuit includes a storage capacitor;
a control electrode of the third transistor is electrically connected to the second initialization control line, a first electrode of the third transistor is electrically connected to the second initialization voltage line, and a second electrode of the third transistor is electrically connected to the control electrode of the driving transistor;
a control electrode of the fourth transistor is electrically connected with the scanning line, a first electrode of the fourth transistor is electrically connected with the data line, and a second electrode of the fourth transistor is electrically connected with the first electrode of the driving transistor;
a control electrode of the fifth transistor is electrically connected to the light emission control line, a first electrode of the fifth transistor is electrically connected to the first voltage terminal, and a second electrode of the fifth transistor is electrically connected to the first electrode of the driving transistor;
a control electrode of the sixth transistor is electrically connected with the scanning line, a first electrode of the sixth transistor is electrically connected with the control electrode of the driving transistor, and a second electrode of the sixth transistor is electrically connected with the second electrode of the driving transistor;
the first electrode plate of the storage capacitor is electrically connected with the control electrode of the driving transistor, and the second electrode plate of the storage capacitor is electrically connected with the first voltage end.
As shown in fig. 3, on the basis of at least one embodiment of the pixel circuit shown in fig. 2, the light emitting element is an organic light emitting diode O1; the first initialization circuit 12 includes a first transistor T1; the first light emission control circuit 11 includes a second transistor T2; the drive circuit 10 includes a drive transistor T0; the second initialization circuit 22 includes a third transistor T3, the data write circuit 23 includes a fourth transistor T4, the second light emission control circuit 24 includes a fifth transistor T5, the compensation control circuit 25 includes a sixth transistor T6, and the tank circuit 26 includes a storage capacitor C0; the first and second initial voltage lines are the same initial voltage line INIT;
a gate of the first transistor T1 is electrically connected to the first initial control line AR, a source of the first transistor T1 is electrically connected to an initial voltage line INIT, and a drain of the first transistor T1 is electrically connected to an anode of the organic light emitting diode O1;
a gate electrode of the second transistor T2 is electrically connected to the emission control line EM, a source electrode of the second transistor T2 is electrically connected to a drain electrode of the driving transistor T0, and a drain electrode of the second transistor T2 is electrically connected to an anode electrode of an organic light emitting diode O1;
a gate of the third transistor T3 is electrically connected to the second initial control line SCAN (N-1), a source of the third transistor T3 is electrically connected to the initial voltage line INIT, and a drain of the third transistor T3 is electrically connected to the gate of the driving transistor T0;
a gate electrode of the fourth transistor T4 is electrically connected to the SCAN line SCAN, a source electrode of the fourth transistor T4 is electrically connected to the Data line Data, and a drain electrode of the fourth transistor T4 is electrically connected to the source electrode of the driving transistor T0;
a gate of the fifth transistor T5 is electrically connected to the emission control line EM, a source of the fifth transistor T5 is electrically connected to a high voltage terminal Vd, and a drain of the fifth transistor T5 is electrically connected to a source of the driving transistor T0;
a gate electrode of the sixth transistor T6 is electrically connected to the SCAN line SCAN, a source electrode of the sixth transistor T6 is electrically connected to the gate electrode of the driving transistor T0, and a drain electrode of the sixth transistor T6 is electrically connected to the drain electrode of the driving transistor T0;
a first plate of the storage capacitor C0 is electrically connected to the gate of the driving transistor T0, and a second plate of the storage capacitor C0 is electrically connected to the high voltage terminal Vd;
the cathode of the organic light emitting diode O1 is electrically connected to a low voltage terminal for providing a low level signal VSS.
In fig. 3, the light emitting node N0 is a node electrically connected to the anode of O1.
In at least one embodiment of the pixel circuit shown in fig. 3, all the transistors are p-type thin film transistors, but not limited thereto.
As shown in fig. 4, when at least one embodiment of the pixel circuit shown in fig. 3 is in operation, a display period (which may be a frame time) includes an initialization phase S1, a data writing phase S2, and a light emitting phase S2;
in the initialization stage S1, the EM provides a high level signal, the SCAN (N-1) provides a low level signal, the SCAN provides a high level signal, the AR provides a low level signal, the T5 is turned off, the T2 is turned off, the T1 is turned on, and the INIT provides an initial voltage to the anode of the O1; t3 is turned on, INIT provides initial voltage to the grid of T0 to clear the original data voltage stored in the capacitor plate; t4 is turned off, T6 is turned off;
in the data writing phase S2, the EM provides a high level signal, the SCAN (N-1) provides a high level signal, the SCAN provides a low level signal, the AR provides a low level signal, the T5 and the T2 are turned off, the T1 is turned on, and the INIT provides an initial voltage to the anode of the O1; t3 is turned off; t4 is turned on, Data provides Data voltage Vd to the source of T0; t6 is turned on to make the gate of T0 and the drain of T0 communicate with each other, at the beginning of S2, T0 is turned on, Data provides Data voltage Vd to charge C0 through T0 and T6, until the potential of the gate of T0 becomes Vd + Vth, and T0 is turned off; wherein Vth is a threshold voltage of T0;
in the lighting phase S3, the EM provides a low level signal, the SCAN (N-1) provides a high level signal, the SCAN provides a high level signal, the AR provides a high level signal, T5 and T2 are turned on, T1 is turned off, T4 is turned off, T3 is turned off, T6 is turned off, and T0 is turned on to drive O1 to light.
As can be seen from fig. 4, the first initialization control signal provided by the first initialization control line AR and the emission control signal provided by the emission control line EM are mutually inverted, so that in the non-emission phase, the T1 can be controlled to be turned on by the first initialization control signal provided by the first initialization control line AR, thereby writing the initialization voltage provided by the initialization voltage line INIT into the anode of the organic light emitting diode O1. At all times of non-light emission within one frame time, the potential of N0 is initialized by INIT, so that there is no voltage difference between the anode in the red pixel circuit, the anode in the green pixel circuit and the anode in the blue pixel circuit, and the lateral leakage at this time is fundamentally eliminated.
In specific implementation, when the luminance is low, the duty ratio of the light-emitting control signal is relatively low, so that no voltage difference exists between the light-emitting nodes N0 in different pixel circuits for most of time, the lateral leakage can be greatly reduced, the gray scratching (low gray level damage) is improved, and the result of optimizing the display picture is achieved.
In a specific implementation, the first initial control line may be formed of a first gate metal layer, and the first initial voltage line may be formed of a second gate metal layer;
the first transistor may include a first active pattern including a first conductive portion, a first channel portion, and a second conductive portion sequentially arranged in a first direction; the first conductive portion serves as a first pole of the first transistor, and the second conductive portion serves as a second pole of the first transistor;
the first initial voltage wire is electrically connected with a first conductive connecting part through a first through hole, and the first conductive connecting part is formed on the source drain metal layer;
the first conductive connection part is electrically connected to the second conductive part through a second via hole so that the first preliminary voltage line is electrically connected to the second pole of the first transistor.
Optionally, the first direction may be the same or approximately the same as an extending direction of the data line, but is not limited thereto.
In at least one embodiment of the present invention, the first initial control line may be formed of a first gate metal layer, the first initial voltage line may be formed of a second gate metal layer, and the first initial voltage line is introduced into the pixel circuit from the second gate metal layer, and the anode of the pixel circuit is initialized by the first transistor.
As shown in fig. 5, the plates of the storage capacitor and the electrodes of the transistors are labeled on the basis of at least one embodiment of the pixel circuit shown in fig. 3.
In fig. 5, a gate denoted by G1 as T1, a source denoted by S1 as T1, a drain denoted by D1 as T1, a gate denoted by G2 as T2, a gate denoted by G3 as T3, a gate denoted by G4 as T4, a gate denoted by G5 as T5, a gate denoted by G6 as T6, a gate denoted by G0 as T0, a first plate denoted by C0 as C0a, and a second plate denoted by C0 as C0 b.
In specific implementation, when a display substrate including at least one embodiment of the pixel circuit shown in fig. 5 is manufactured, a semiconductor material layer may be sequentially disposed on a substrate, and a patterning process may be performed on the semiconductor material layer to form an active layer of each transistor; manufacturing a first gate insulating layer on one surface of the active layer, which is opposite to the substrate; manufacturing a first gate metal layer on one surface of the first gate insulating layer, which faces away from the active layer, and performing a patterning process on the first gate metal layer to form a first initial control line AR, a second initial control line SCAN (N-1), a SCAN line SCAN, a light-emitting control line EM, gates of transistors included in the pixel circuit, and a first plate C0a of the storage capacitor; then, with the grid electrode of each transistor as a mask, doping the part, which is not covered by the grid electrode, of the active layer, so that the part, which is not covered by the grid electrode, of the active layer is formed into a conductive part, and the part, which is covered by the grid electrode, of the active layer is formed into a channel part; the conductive portion serves as a first pole of a transistor or a second pole of a transistor; alternatively, the conductive portion is coupled to a first pole of a transistor or a second pole of a transistor; manufacturing a second gate insulating layer on one surface of the first gate metal layer, which is opposite to the substrate; arranging a second gate metal layer on one surface, opposite to the first gate metal layer, of the second gate insulating layer, and performing a composition process on the second gate metal layer to form a second polar plate of the storage capacitor and an initial voltage line INIT; arranging an interlayer dielectric layer on one surface of the second gate metal layer, which is opposite to the second gate insulating layer; arranging a plurality of through holes on a substrate provided with an active layer, a first gate insulating layer, a first gate metal layer, a second gate insulating layer, a second gate metal layer and an interlayer dielectric layer; and arranging a source-drain metal layer on one surface of the interlayer dielectric layer, which is opposite to the second gate metal layer, and performing a composition process on the source-drain metal layer to form a conductive connecting part, a Data line Data and a high-level signal line Vd.
In fig. 6, a source denoted by S3 is a T3, a first conductive portion denoted by L11, a first channel portion denoted by L10, a second conductive portion denoted by L12, L11 serves as a source of T1, and L12 serves as a drain of T1.
In fig. 7, a gate with a designation G3 is a gate of T3, a gate with a designation G6 is a gate of T6, a first plate with a designation C0a is a gate of C0, and C0a is multiplexed with a gate of T0; a gate electrode of T5 is denoted by G5, a gate electrode of T2 is denoted by G2, a gate electrode of T1 is denoted by G1, a second initial control line is denoted by SCAN (N-1), a SCAN line is denoted by SCAN, an emission control line is denoted by EM, and a first initial control line is denoted by AR.
In fig. 8, the second plate is labeled C0 and labeled C0b, and the initial voltage line is labeled INIT.
In fig. 9, Data, Vd, a high-level signal line, L1, and L2 are respectively denoted by Data lines, high-level signal lines, and first and second conductive connection portions.
In fig. 10, black rectangles indicate vias, where H1 indicates a first via, H2 indicates a second via, and H3 indicates a third via.
As shown in fig. 6-10, L12 is electrically connected to L1 through H1, wherein L12 serves as the source of T1 and L1 is electrically connected to INIT through H2, thereby electrically connecting the source of T1 to INIT so that INIT is accessed to the pixel circuit.
As shown in fig. 6-10, the source S3 of T3 is electrically connected to L2 through H3, and L2 is electrically connected to an adjacent previous row of initial voltage lines (not shown in fig. 8 and 10) through a via (not shown in fig. 10), so that the source S3 of T3 is electrically connected to the adjacent previous row of initial voltage lines.
The driving method according to the embodiment of the present invention is applied to the pixel circuit, and includes:
the first initialization circuit controls disconnection between the first initial voltage line and the first pole of the light emitting element under control of a first initial control signal supplied from a first initial control line (anodreset) while the first light emission control circuit controls communication between the driving circuit and the first pole of the light emitting element;
when the first light-emitting control circuit controls the drive circuit to be disconnected from the first pole of the light-emitting element, the first initialization circuit keeps a conducting state under the control of the first initial control signal and controls the first initial voltage line to write the first initial voltage into the first pole of the light-emitting element.
In the driving method according to the embodiment of the invention, in the light emitting stage, the first light emitting control circuit controls the driving circuit to be connected to the first pole of the light emitting element, and the first initializing circuit controls to disconnect the first initializing voltage line from the first pole of the light emitting element under the control of a first initializing control signal provided by the first initializing control line; in a non-light emitting period, when the first light emitting control circuit controls the driving circuit to be disconnected from the first pole of the light emitting element E1, the first initializing circuit maintains a turned-on state under the control of the first initializing control signal, and the first initializing circuit controls the first initializing voltage line to write the first initializing voltage to the first pole of the light emitting element. In the non-light-emitting stage, the voltage difference of the first electrodes of the light-emitting elements in different pixel circuits included in the display device is reduced through the first initialization circuit, so that the lateral electric leakage is effectively reduced, and the low-gray-scale damage phenomenon is improved.
The display device provided by the embodiment of the invention comprises the pixel circuit.
In the embodiment of the present invention, the display device may be an AMOLED display device, but is not limited thereto.
In at least one embodiment of the present invention, the first initial voltage applied to all the pixel circuits included in the display device is the same, so that the voltage difference of the first poles of the light emitting elements in different pixel circuits included in the display device is approximately 0 in the non-light emitting period.
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 embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A pixel circuit is characterized by comprising a light-emitting element, a driving circuit, a first light-emitting control circuit and a first initialization circuit;
the drive circuit is used for generating drive current under the control of the potential of the control end of the drive circuit;
the first light-emitting control circuit is respectively electrically connected with a light-emitting control line, the driving circuit and a first pole of the light-emitting element and is used for controlling the connection or disconnection between the driving circuit and the first pole of the light-emitting element under the control of a light-emitting control signal provided by the light-emitting control line;
the first initialization circuit is electrically connected to a first initialization control line, a first pole of the light emitting element, and a first initialization voltage line, respectively, and is configured to control disconnection between the first initialization voltage line and the first pole of the light emitting element under control of a first initialization control signal provided by the first initialization control line when the first light emitting control circuit controls connection between the driving circuit and the first pole of the light emitting element, and to maintain a conducting state under control of the first initialization control signal and control the first initialization voltage line to write a first initialization voltage to the first pole of the light emitting element when the first light emitting control circuit controls disconnection between the driving circuit and the first pole of the light emitting element.
2. The pixel circuit according to claim 1, wherein the first initialization circuit includes a first transistor;
a control electrode of the first transistor is electrically connected to the first initial control line, a first electrode of the first transistor is connected to the first initial voltage line, and a second electrode of the first transistor is electrically connected to the first electrode of the light emitting element.
3. The pixel circuit according to claim 1, wherein the first light emission control circuit includes a second transistor;
a control electrode of the second transistor is electrically connected to the light-emitting control line, a first electrode of the second transistor is electrically connected to the driving circuit, and a second electrode of the second transistor is electrically connected to the first electrode of the light-emitting element.
4. A pixel circuit according to claim 2 or 3, wherein the first initialization control line is formed of a first gate metal layer, and the first initialization voltage line is formed of a second gate metal layer;
the first transistor comprises a first active pattern, wherein the first active pattern comprises a first conductive part, a first channel part and a second conductive part which are sequentially arranged along a first direction; the first conductive portion serves as a first pole of the first transistor, and the second conductive portion serves as a second pole of the first transistor;
the first initial voltage wire is electrically connected with a first conductive connecting part through a first through hole, and the first conductive connecting part is formed on the source drain metal layer;
the first conductive connection part is electrically connected to the second conductive part through a second via hole so that the first preliminary voltage line is electrically connected to the second pole of the first transistor.
5. The pixel circuit according to any one of claims 1 to 3, further comprising a drive circuit, a second initialization circuit, a data write circuit, a second light emission control circuit, a compensation control circuit, and a tank circuit;
the second initialization circuit is respectively electrically connected with a second initial control line, a second initial voltage line and the control end of the driving circuit, and is used for writing a second initial voltage provided by the second initial voltage line into the control end of the driving circuit under the control of a second initial control signal provided by the second initial control line;
the data writing circuit is respectively electrically connected with the scanning line, the data line and the first end of the driving circuit and is used for writing the data voltage on the data line into the first end of the driving circuit under the control of the scanning signal provided by the scanning line;
the second light-emitting control circuit is respectively electrically connected with a light-emitting control line, a first voltage end and the first end of the driving circuit and is used for controlling the first voltage end to be communicated with the first end of the driving circuit under the control of the light-emitting control signal;
the compensation control circuit is respectively electrically connected with the scanning line, the control end of the driving circuit and the second end of the driving circuit and is used for controlling the communication between the control end of the driving circuit and the second end of the driving circuit under the control of the scanning signal;
the energy storage circuit is electrically connected with the control end of the driving circuit and is used for storing electric energy;
and the second pole of the light-emitting element is electrically connected with the second voltage end.
6. The pixel circuit according to claim 5, wherein the first initialization circuit includes a first transistor;
the second pole of the first transistor is electrically connected with the second end of the driving circuit.
7. The pixel circuit according to claim 5, wherein the driver circuit includes a driver transistor, the second initialization circuit includes a third transistor, the data write circuit includes a fourth transistor, the second emission control circuit includes a fifth transistor, the compensation control circuit includes a sixth transistor, the tank circuit includes a storage capacitor;
a control electrode of the third transistor is electrically connected to the second initialization control line, a first electrode of the third transistor is electrically connected to the second initialization voltage line, and a second electrode of the third transistor is electrically connected to the control electrode of the driving transistor;
a control electrode of the fourth transistor is electrically connected with the scanning line, a first electrode of the fourth transistor is electrically connected with the data line, and a second electrode of the fourth transistor is electrically connected with the first electrode of the driving transistor;
a control electrode of the fifth transistor is electrically connected to the light emission control line, a first electrode of the fifth transistor is electrically connected to the first voltage terminal, and a second electrode of the fifth transistor is electrically connected to the first electrode of the driving transistor;
a control electrode of the sixth transistor is electrically connected with the scanning line, a first electrode of the sixth transistor is electrically connected with the control electrode of the driving transistor, and a second electrode of the sixth transistor is electrically connected with the second electrode of the driving transistor;
the first electrode plate of the storage capacitor is electrically connected with the control electrode of the driving transistor, and the second electrode plate of the storage capacitor is electrically connected with the first voltage end.
8. A driving method applied to the pixel circuit according to any one of claims 1 to 7, the driving method comprising:
when the first light-emitting control circuit controls the connection between the driving circuit and the first pole of the light-emitting element, the first initialization circuit controls to disconnect the first initial voltage line from the first pole of the light-emitting element under the control of a first initial control signal provided by a first initial control line;
and the first initialization circuit keeps a conducting state under the control of the first initialization control signal and controls the first initialization voltage line to write the first initialization voltage into the first pole of the light-emitting element when the first light-emitting control circuit controls the drive circuit to be disconnected from the first pole of the light-emitting element.
9. A display device comprising the pixel circuit according to any one of claims 1 to 7.
10. The display device according to claim 9, wherein the first initial voltage applied to all the pixel circuits included in the display device is the same.
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| CN202110566255.4A CN113299242A (en) | 2021-05-24 | 2021-05-24 | Pixel circuit, driving method and display device |
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