CN109119029B - Pixel circuit, driving method thereof, display device and electronic equipment - Google Patents

Pixel circuit, driving method thereof, display device and electronic equipment Download PDF

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CN109119029B
CN109119029B CN201810632259.6A CN201810632259A CN109119029B CN 109119029 B CN109119029 B CN 109119029B CN 201810632259 A CN201810632259 A CN 201810632259A CN 109119029 B CN109119029 B CN 109119029B
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transistor
node
driving
pole
data
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CN109119029A (en
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张盛东
易水平
廖聪维
林兴武
吴继祥
霍新新
王莹
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Peking University Shenzhen Graduate School
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Peking University Shenzhen Graduate School
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3258—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the voltage across the light-emitting element
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3266—Details of drivers for scan electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3275—Details of drivers for data electrodes
    • G09G3/3291—Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements

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  • 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)
  • Electroluminescent Light Sources (AREA)
  • Control Of El Displays (AREA)

Abstract

The invention discloses a pixel circuit, a driving method thereof, a display device and electronic equipment. In the data input stage, effective voltage information on the storage capacitor is changed by discharging the grid end of the driving tube, so that the change of the mobility is effectively compensated, and the influence of parasitic quantity can be reduced by completely isolating the coupling capacitor from a circuit in the light emitting stage. The pixel circuit only needs two control time sequences, the complexity of a peripheral drive IC can be reduced, and the aperture opening ratio of the pixel is improved. In addition, the pixel circuit can be well applied to the field of micro display, and the mobility compensation structure can effectively enlarge the data input range of the micro display pixel by controlling the discharge time due to the coupled discharge of the input data voltage, so that the aim of enlarging the data voltage range is fulfilled.

Description

Pixel circuit, driving method thereof, display device and electronic equipment
Technical Field
The invention relates to the technical field of display devices, in particular to a pixel circuit, a driving method thereof, a display device and electronic equipment.
Background
In recent years, an Active Matrix Organic Light Emitting Diode (AMOLED) display has attracted more and more attention because it has many advantages of ultra-thin, high response speed, high contrast, high color saturation, and the like. The amorphous indium gallium zinc oxide (a-IGZO) TFT has better uniformity, higher mobility and lower cost, and is beneficial to the mass production of AMOLED.
However, the AMOLED design must compensate for the degradation of the electrical characteristics of the a-IGZO TFT and the OLED. For example, the threshold voltage of the TFT driver may shift under the bias stress of the gate voltage, and the electrical stress at different positions may be different, which results in different threshold voltage variations at different pixel points. Furthermore, as the size of the AMOLED display increases, compensation for non-uniformity of mobility also needs to be considered. Meanwhile, the OLED is also degraded by long-term electrical stress, and the threshold voltage of the OLED is increased. In addition, the luminous efficiency of the OLED also decreases during long-term operation, which means that the luminance of the OLED decreases even if the current flowing through the OLED is constant. Therefore, it is also necessary to compensate for the increase in the threshold voltage of the OLED and the degradation in the luminous efficiency.
To solve these problems and improve the quality of the display image, various pixel compensation circuits have been proposed, and these circuits are roughly classified into two categories: a current-driven type pixel circuit and a voltage-driven type pixel circuit. The voltage-driven type has a faster charge/discharge speed than the current-driven type, and can satisfy the demand for large-area, high-resolution display. However, many voltage-type driving circuits have limited compensation functions, and generally only aim at threshold voltage compensation, and a plurality of control signal lines are introduced, so that the circuit has high requirements on external driving ICs, and layout wiring of pixels becomes complicated.
Chinese patent application No. cn201510166569.x entitled "a pixel circuit and driving method thereof and display device" discloses a pixel circuit having threshold voltage compensation and mobility difference compensation. The mobility compensation structure is only suitable for a driving tube adopting a double-gate transistor, and the basic principle that the driving tube compensates the threshold voltage of the driving tube according to the feedback of the feedback unit is as follows: when the threshold voltage of the driving tube T1 drifts under the action of long-time electric stress, the threshold voltage of the driving tube T1 increases or decreases, so that the driving tube T1 changes in the opposite direction, i.e., the drive current decreases or increases (as shown in equation 1). The voltage dropped on the feedback unit (resistor R) is IDAnd R is shown in the specification. Thus, VTHThe increase or decrease of (b) causes the voltage drop across the feedback unit (resistor R) to decrease or increase accordingly. The potential of the first pole and the second grid of the driving tube T1 is equal to VDD-IDR, therefore IDThis causes the potential of the first and second gates of the drive tube T1 to decrease or increase accordingly. That is, with VTHThe potentials of the first and second gates of the driving tube T1 increase or decrease accordingly. Further, when the two gates of the dual-gate transistor are controlled separately, the threshold voltage of the dual-gate transistor changes according to the change of the potential of any one of the gate electrodes, that is, when the potential of the second gate of the driving transistor T1 increases, the threshold voltage decreases, and when the signals of the other electrodes are the same, the current increases; when the second gate potential of the driving transistor T1 decreases, the threshold voltage thereof increases, and the current thereof decreases when the other electrode signals are the same. Therefore, when the threshold voltage of the driving transistor T1 becomes larger due to the drift (the current of the light emitting element D decreases), the feedback of the feedback unit (the resistor R) makes the threshold voltage thereof smaller again, and the current increases (i.e., the current of the light emitting element D increases); conversely, when the threshold voltage of the driving transistor T1 becomes lower due to the drift (the current of the light emitting element D increases), the feedback of the resistor R increases the threshold voltage thereof and decreases the current (that is, the current of the light emitting element D decreases). Therefore, the circuit restrains the current non-uniformity of the driving tube T1 caused by the threshold voltage drift, and improves the uniformity of the brightness of the light-emitting device.
In the same compensation principle, the pixel circuit in the cn201510166569.x patent has a compensation effect on the mobility difference of the driving tube T1 in addition to the threshold voltage shift of the driving tube T1. As the mobility of the driving tube T1 becomes larger, the driving current generated by the driving tube T1 becomes larger, the voltage falling on the feedback unit (resistor R) becomes larger, the potentials of the first and second gates of the driving tube T1 decrease, the threshold voltage of the driving tube T1 becomes larger, thereby decreasing the driving current of the driving tube T1, and thus it is possible to suppress the variation of the driving current of the light emitting element D due to the mobility difference of the driving tube T1. This stabilizes the driving current supplied by the driving transistor T1 to the light emitting device D, thereby solving the problem of uneven light emission of the light emitting device D and improving the display quality.
Disclosure of Invention
The invention provides a pixel circuit, a driving method thereof, a display device and electronic equipment, and solves the display problem caused by threshold voltage offset and mobility difference in the working process of the pixel circuit.
According to a first aspect of the present invention, there is provided a pixel circuit comprising: the device comprises a light-emitting element, a threshold voltage extraction module, a driving module and a mobility compensation module;
the threshold voltage extraction module at least comprises a storage capacitor, and the driving module at least comprises a driving transistor; the first end of the storage capacitor and the control electrode of the driving transistor are connected to a first node and used for storing data voltage in a data writing phase;
the threshold voltage extraction module is connected with the driving module and used for extracting the threshold voltage of the driving transistor in a threshold voltage extraction stage;
the driving module is connected with the light-emitting element and used for driving the light-emitting element to emit light according to the data voltage stored on the first node in a light-emitting stage;
the mobility compensation module is respectively connected with the threshold voltage extraction module and the driving module, and is used for partially discharging the data voltage coupled to the first node through the driving transistor in a data writing stage so as to extract mobility information.
Further, the mobility compensation module comprises a second transistor, a third transistor and a coupling capacitor;
a control electrode of the second transistor is used for being connected to a second scanning signal line, a first electrode of the second transistor is used for being connected to a data signal line, and a third electrode of the second transistor is connected to the first end of the coupling capacitor; the second end of the coupling capacitor is connected to the first pole of the third transistor; a control electrode of the third transistor is used for being connected to a second scanning signal line, and a second electrode of the third transistor is connected to the first node;
the second and third transistors couple a data voltage inputted from the data signal line to the first node in response to a second scan signal inputted from the second scan signal line in a data input stage, and partially discharge the data voltage coupled to the first node through the driving transistor to extract mobility information.
In one embodiment, the first pole of the light emitting element is connected to the second node, and the second pole is used for grounding;
the driving module further comprises a first transistor, a control electrode of the first transistor is used for being connected to a first scanning signal line, a first electrode of the first transistor is used for being connected to a power supply line or the first scanning signal line, and a second electrode of the first transistor is connected to the first electrode of the driving transistor; a second pole of the driving transistor is connected to the second node.
In another embodiment, the first pole of the light emitting element is connected to the second node and the second pole is used for grounding;
the driving module further comprises a first transistor and a fifth transistor; a control electrode of the first transistor is used for being connected to a first scanning signal line, a first electrode of the first transistor is used for being connected to a power supply line or the first scanning signal line, and a second electrode of the first transistor is connected to the first node; a control electrode of the fifth transistor is connected to the first node, a first electrode of the fifth transistor is connected to the second end of the coupling capacitor, and a second electrode of the fifth transistor is connected to the second node; the control electrode of the driving transistor is connected to the first node, the first electrode is used for being connected to a power supply line, and the second electrode is connected to the second node.
In particular, the second terminal of the storage capacitor is connected to the second node, either for ground or for connection to the power supply line.
Further, the threshold voltage extraction module further includes a fourth transistor having a control electrode for connecting to the second scan signal line, a first electrode for connecting to the second node, a second electrode for connecting to the first scan signal line, or a second electrode for connecting to a low potential terminal.
According to a second aspect of the present invention, the present invention also provides a driving method of any one of the above pixel circuits, including:
an initialization stage: the driving module initializes a control electrode of the driving transistor to a high potential;
a threshold voltage extraction stage: the drive transistor conducts discharge under the condition that a control electrode of the drive transistor is at a high potential until the drive transistor is cut off; the threshold voltage extraction module extracts the threshold voltage of the driving transistor in the process that the driving transistor is changed from on to off and stores the threshold voltage on the storage capacitor;
a data input stage: coupling a data voltage to the first node through a mobility compensation module and partially discharging the data voltage stored on the first node through the driving transistor to extract mobility information;
a light emitting stage: the light emitting element emits light according to the data voltage stored on the first node under the driving of the driving transistor.
Preferably, the method is characterized by further comprising: the anode of the light emitting element is kept at a negative potential except for the light emitting period.
According to a third aspect of the present invention, there is also provided a display device comprising: a pixel circuit matrix comprising any of the pixel circuits described above arranged in a matrix of n rows and m columns, n and m being integers greater than 0;
the grid driving circuit is used for generating and providing scanning signals for the pixel circuit matrix through scanning signal lines;
a data driving circuit for generating and supplying a data voltage signal representing gray scale information to the pixel circuit matrix through a data signal line;
and a controller for providing control timing to the gate driving circuit and the data driving circuit.
According to a fourth aspect of the present invention, there is also provided an electronic apparatus including the display device as described above.
By implementing the embodiment of the invention, the display problem caused by threshold voltage offset and mobility difference in the working process of the pixel circuit can be solved.
Drawings
Fig. 1 is a schematic structural diagram of a pixel circuit according to a first embodiment of the invention;
FIG. 2 is a timing diagram of related signals during the operation of a pixel circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a pixel circuit according to a second embodiment of the invention.
Fig. 4 is a schematic structural diagram of a pixel circuit according to a third embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a pixel circuit according to a fourth embodiment of the present invention;
fig. 6 is a schematic structural diagram of a pixel circuit according to a fifth embodiment of the present invention;
fig. 7 is a schematic structural diagram of a pixel circuit according to a sixth embodiment of the present invention;
fig. 8 is a schematic structural diagram of a pixel circuit according to a seventh embodiment of the present invention;
FIG. 9 is a timing diagram of signals involved in the operation of a pixel circuit according to a seventh embodiment of the present invention;
fig. 10 is a flowchart illustrating a driving method of a pixel circuit according to an eighth embodiment of the invention;
FIG. 11 is a schematic structural diagram of a display device according to a ninth embodiment of the present invention;
FIG. 12 is a timing diagram of related signals during the operation of the display device according to the ninth embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The transistors in the various embodiments of the present invention may be any structure of transistor, such as Bipolar Junction Transistors (BJTs) or Field Effect Transistors (FETs). When the transistor is a bipolar transistor, the control electrode of the transistor is defined as the base electrode of the bipolar transistor, the first electrode may be defined as the collector or emitter of the bipolar transistor, and the corresponding second electrode may be defined as the emitter or collector of the bipolar transistor, and in the practical application process, the "emitter" and the "collector" may be interchanged according to the signal flow direction. When the transistor is a field effect transistor, the control electrode thereof defines a gate electrode of the field effect transistor, the first electrode may be defined as a drain electrode or a source electrode of the field effect transistor, and the corresponding second electrode may be defined as a source electrode or a drain electrode of the field effect transistor, and in a practical application process, the "source electrode" and the "drain electrode" may be interchanged according to a signal flow direction. The transistor in the display device is typically a Thin Film Transistor (TFT), which is a type of field effect transistor. The definition of the transistor control electrode, the first electrode and the second electrode may specifically be determined by the circuit function to be realized when the circuit is operated.
The light emitting element may refer to an organic light emitting diode, an inorganic light emitting diode, a quantum dot light emitting diode, and the like. A first pole of a light emitting element may be defined as an anode or a cathode and a corresponding second pole may be defined as a cathode or an anode. The definition of the first and second poles of the light emitting element may specifically be determined in terms of the circuit function to be achieved when the circuit is operated.
In the following embodiments, the transistors and the Light Emitting devices are illustrated by using N-channel a-IGZO TFTs and OLEDs (Organic Light-Emitting diodes), respectively.
The main design idea of the invention is as follows: the compensation is carried out as fully as possible by means of a timing control which is as simple as possible. Wherein the threshold voltage compensation discharges by connecting the driving tube into a diode; the mobility compensation effectively reduces the influence of mobility change on OLED current (driving tube saturation current) by partially discharging the gate end potential of the driving tube in a data coupling stage, and because the OLED current is determined by the gate source voltage of the driving tube on one hand and is also influenced by the mobility of the driving tube on the other hand, the influence of the mobility can be effectively reduced by controlling the gate source voltage.
The cn201510166569.x patent compensates for mobility utilization by: the increase in mobility causes an increase in the drive tube current, when the voltage drop (V) across the feedback unit is largeDD-VG2) Increase and drive the second grid end potential (V) of the tubeG2) And the threshold voltage of the driving tube is increased, so that the current is reduced, and negative feedback inhibition is realized.
The compensation principle of the invention is as follows: in the data input stage, the driving tube is conducted again, the increase of the mobility rate can cause the increase of the current of the driving tube, the discharge of the grid end of the driving tube is accelerated, and therefore the grid source voltage V of the driving tube is causedGSThe current is reduced, so that the influence of the change of the mobility on the current of the driving tube is effectively inhibited.
The first embodiment is as follows:
as shown in fig. 1, the present embodiment provides a pixel circuit including: the device comprises a light-emitting element D, a threshold voltage extraction module, a driving module and a mobility compensation module.
The threshold voltage extraction module at least comprises a storage capacitor CS1The driving module at least comprises a driving transistor TD; storage capacitor CS1Is connected to the first node a with the control electrode of the drive transistor TD for storing the data voltage during the data writing phase.
The threshold voltage extraction module is connected with the driving module and used for extracting the threshold voltage of the driving transistor TD in the threshold voltage extraction stage so as to realize threshold voltage compensation.
The driving module is connected to the light emitting element D, and is configured to drive the light emitting element D to emit light according to the data voltage stored on the first node a in the light emitting phase.
The mobility compensation module is respectively connected with the threshold voltage extraction module and the drive module, and is used for partially discharging the data voltage coupled to the first node A through the drive transistor TD in a data writing stage so as to extract mobility information and further effectively compensate invalidity of mobility.
In this embodiment, the mobility compensation module includes a second transistor T2, a third transistor T3, and a coupling capacitor CS2。
A control electrode of the second transistor T2 is for connection to a second scan signal line VSCAN2A first pole for connection to a data signal line VDATAThe third pole is connected to the coupling capacitor CS2A first end of (a); coupling capacitor CS2Is connected to a first pole of a third transistor T3; a control electrode of the third transistor T3 for connecting to the second scan signal line VSCAN2And a second pole is connected to the first node a.
The second transistor T2 and the third transistor T3 are responsive to the second scan signal line V in the data input stageSCAN2A second scanning signal is input to the data signal line VDATAThe input data voltage is coupled to the first node a, and the data voltage coupled to the first node a is partially discharged through the driving transistor TD to extract mobility information.
The first pole of the light emitting element D is connected to the second node B, and the second pole is used for grounding.
The driving module further includes a first transistor T1, a control electrode of the first transistor T1 is connected to the first scan signal line VSCAN1A first pole for connection to a supply line VDDThe second pole is connected to the first pole of the driving transistor TD; the second pole of the driving transistor TD is connected to the second node (B).
The threshold voltage extraction module further includes a fourth transistor T4, a control electrode of the fourth transistor T4 for connecting to the second scan signal line VSCAN2A first pole connected to a second node B and a second pole for connection to a low potential terminal VL。
Storage capacitor CS1Is connected to a second node B.
The working process of the pixel circuit provided by the embodiment includes four stages: the method comprises an initialization phase, a threshold voltage extraction phase, a data input phase and a light emitting phase. The following four stages are described in detail, and it should be understood that, in this embodiment, the operation process of the pixel circuit is divided into the above four stages only based on the most basic functions of the pixel circuit, and different technicians may also divide the operation process into other different operation stages according to different subjective understandings, so the division of the operation stages should not form a limitation to the present invention.
(1) An initialization stage:
the purpose is as follows: initializing high potential of a grid electrode potential of a driving transistor TD to meet the conduction requirement of the driving transistor TD and preparing for a threshold voltage extraction stage; the anode potential of the OLED (i.e., the light emitting element D) is initialized to a low potential, so that the OLED is turned off, and the panel contrast is increased.
First scanning signal line VSCAN1And a second scanning signal line VSCAN2When high level is input simultaneously, T1, T2, T3 and T4 are conducted, and V isDDTwo capacitors C are paired through T1 and T3 tubesS1And CS2Charging is carried out, and the potential of the first node A is raised to a high potential VHWhile the data signal line VDATAAt an initialization voltage VREFIs 0, it is transmitted to C through T2S2And the other end of the same. At this time CS1Is also discharged to V through T4L。
(2) A threshold voltage extraction stage:
the purpose is as follows: the diode connection is used to discharge the driving transistor TD, and the threshold voltage of the driving transistor TD is extracted and stored in the storage capacitor CS1In this way, the influence of the threshold voltage can be eliminated in the light-emitting stage.
First scanning signal line VSCAN1When the high potential is changed into the low potential, the T1 tube is closed, at the moment, because the grid-source voltage at two ends of the driving transistor TD is greater than the threshold voltage, the TD is conducted, and the potential of the first node A is discharged to V through the TD and the T4 tubeTH_TD+VLAt this point the TD tube is closed.
(3) A data input stage:
the purpose is as follows: by means of a capacitor CS1And CS2The coupling voltage division couples a certain proportion of data voltage at the grid end of the driving transistor so as to enlarge the data input range and effectively improve the compensation effect.
First scanning signal line VSCAN1And a second scanning signal line VSCAN2Potential maintenance ofWhen the voltage signal on the data signal line is changed from 0 to V, the T1 is turned off, the T2, the T3 and the T4 are still turned onDATAIs transmitted to CS2At this time due to CS1And CS2When the potential of the first node A is raised, the grid-source voltage of the TD tube is larger than the threshold voltage, the TD is turned on again, and the potential of the first node A is reduced by a part of potential delta Vμ_TDThe value becomes:
Figure BDA0001700472700000091
wherein the content of the first and second substances,
Figure BDA0001700472700000092
in the above formula, T is the input time of the data voltage, and k is μ · COX·(W/L)_TDAs gain factors, mu and COXRespectively, mobility of a carrier of the TFT and a capacitance of a gate insulating layer, and W and L respectively represent a channel width and a length of the TFT. Then C isS1The voltage stored across is:
Figure BDA0001700472700000093
(4) a light emitting stage:
first scanning signal line VSCAN1And a second scanning signal line VSCAN2Is turned over simultaneously to become high level and low level, T2, T3 and T4 are turned off, and C is turned offS2Completely separated from the circuit, the OLED starts to charge through T1, TD, the anode potential of the OLED (i.e. the potential of the second node B) rises above the threshold voltage of the OLED, and the OLED turns on. Meanwhile, the grid potential (first node A) of the TD tube also becomes larger along with the rising of the point B, the voltage difference between the two points is kept unchanged, and when the voltage difference is stable, the current flowing through the OLED is the saturation current of the TD tube. The specific expression is as follows:
Figure BDA0001700472700000094
as can be seen from the above equation, since the OLED current is independent of the threshold voltages of the TFT and the OLED, the threshold shift of the TFT and the threshold degradation of the OLED can be compensated, and the non-uniformity of the mobility μ can be compensated to some extent, and the compensation effect is determined by T.
Fig. 2 is a timing chart of signals in the operation process of the pixel circuit in this embodiment.
The pixel circuit provided by the implementation has the following advantages:
(1) the pixel circuit only needs two control time sequences, so that the complexity and cost of a peripheral IC can be reduced, and the aperture opening ratio of the pixel can be effectively improved;
(2) in the non-light-emitting stage of the pixel circuit, the anode potential of the light-emitting element is always negative, so that the degradation of the light-emitting element can be inhibited, and the contrast of the panel can be increased because no current flows through the light-emitting element;
(3) by using the 2T1C structure formed by the switch tube and the coupling capacitor, partial discharge is carried out on data voltage information coupled to the gate terminal of the driving transistor in the data voltage input stage, and the nonuniformity of the mobility can be effectively compensated.
(4) The coupling capacitor is separated from the data driving circuit in the light-emitting stage, so that the effect of reducing the load capacitance on the data line can be achieved, and the influence of parasitic quantity is reduced.
(5) The pixel circuit realizes the function of mobility compensation on the premise of meeting threshold voltage compensation. In addition, the pixel circuit can be well applied to the field of micro display, the mobility compensation structure can effectively enlarge the data input range of the micro display pixel by controlling the discharge time due to the fact that coupling discharge is carried out on the input data voltage, and therefore the purpose of enlarging the data voltage range is achieved, the pixel circuit has high contrast and high aperture opening ratio, and can be applied to high-resolution and high-frame-rate display devices.
Example two:
as shown in FIG. 3, the present embodiment provides another pixel circuit, which is different from the first embodiment in that the first scanning signal line V is usedSCAN1Substitute power supplyVDDThis has the advantage of having one less power line, and the aperture ratio can be increased, and the operation process is the same as the first embodiment, and the timing of each signal is the same as that in fig. 4.
Example three:
as shown in FIG. 4, the present embodiment provides another pixel circuit, which is based on the second embodiment and is implemented by sequentially reducing a signal line to connect the second pole of the fourth transistor with the PVDDI.e. the first scanning signal line VSCAN1In connection with this, the operation is approximately the same as in the first and second examples, the only difference being that during the initialization phase, the anode potential of the OLED is high, and an initialization current will flow through the OLED, which will reduce the contrast ratio compared to the first and second examples.
Example four:
as shown in fig. 5, this embodiment provides another pixel circuit, which is different from the first embodiment in that the fourth transistor T4 is omitted and the storage capacitor C is usedS1Is connected to the anode of the OLED, the operation of the pixel circuit is as follows:
(1) an initialization stage:
first scanning signal line VSCAN1And a second scanning signal line VSCAN2At the same time, the high, T1, T2, T3 tubes are connected, VDDTwo capacitors C are paired through T1 and T3 tubesS1And CS2Charging is carried out, and the potential of the first node A is raised to a high potential VHWhile the data signal line VDATAInitialization voltage V onREFIs 0, it is transmitted to C through T2S2And the other end of the same.
(2) A threshold voltage extraction stage:
first scanning signal line VSCAN1When the high potential is changed into the low potential, the T1 tube is closed, at the moment, because the grid-source voltage at two ends of the driving transistor TD is greater than the threshold voltage, the TD is conducted, and the potential of the first node A is discharged to V through the TD tube and the OLEDTH_TD+VTH_OLEDAt the moment, the TD tube and the OLED are closed, and the potential of the second node B is VTH_OLED。
(3) A data input stage:
first scanTracing signal line VSCAN1And a second scanning signal line VSCAN2The potential is kept unchanged, T1 is closed, T2 and T3 are still conducted, and the voltage signal on the data signal line is changed from 0 to VDATAIs transmitted to CS2At this time due to CS1、CS2And COLEDThe potential of the first node A and the potential of the second node B are raised, the TD tube and the OLED are turned on again, and the potential of the first node A is reduced by a part of potential delta Vμ_TDThe value becomes:
Figure BDA0001700472700000111
the potential of the second node B is:
Figure BDA0001700472700000112
assuming that the potential of the second node B remains unchanged after the coupling is raised, at this point CS1The voltage stored across is:
Figure BDA0001700472700000113
herein omit the pair Δ Vμ_TDThe principle of the method is the same as that of the first embodiment.
(4) A light emitting stage:
first scanning signal line VSCAN1And a second scanning signal line VSCAN2The potential is simultaneously reversed to become high level and low level respectively, T2 and T3 are closed, CS2Completely separated from the circuit, the OLED starts to charge up via T1, TD and the OLED anode potential (i.e. the potential of the second node B) rises. Meanwhile, the grid potential (first node a) of the TD tube also increases with the increase of the potential of the second node B, the voltage difference between the two nodes remains unchanged, and when the voltage difference is stable, the current flowing through the OLED is the saturation current of the TD tube. The specific expression is as follows:
Figure BDA0001700472700000121
from the above equation, since the OLED current is independent of the threshold voltages of the TFT and the OLED, the threshold shift of the TFT and the threshold degradation of the OLED can be compensated, and the non-uniformity of the mobility μ can be compensated to some extent, and the compensation effect is represented by Δ Vμ_TDDetermine, and Δ Vμ_TDAlso determined by the time T described above.
Of course, in another embodiment, on the basis of the pixel circuit of this embodiment, the first scanning signal line V can be used in a manner similar to that of the above embodimentSCAN1Alternative power supply VDD。
Example five:
as shown in fig. 6, the present embodiment provides another pixel circuit, which is different from the fourth embodiment in CS1Is connected to the first node a and the second terminal is connected to the cathode of the OLED, i.e. to ground, the operation of the pixel circuit is as follows:
(1) an initialization stage:
first scanning signal line VSCAN1And a second scanning signal line VSCAN2At the same time, the high, T1, T2, T3 tubes are connected, VDDTwo capacitors C are paired through T1 and T3 tubesS1And CS2Charging is carried out, and the potential of the first node A is raised to a high potential VHWhile the data signal line VDATAHas an initialization voltage VREF of 0, which is transmitted to C through T2S2And the other end of the same.
(2) A threshold voltage extraction stage:
first scanning signal line VSCAN1When the high potential is changed into the low potential, the T1 tube is closed, at the moment, because the grid-source voltage at two ends of the driving transistor TD is greater than the threshold voltage, the TD is conducted, and the potential of the first node A is discharged to V through the TD tube and the OLEDTH_TD+VTH_OLEDAt the moment, the TD tube and the OLED are closed, and the potential of the second node B is VTH_OLED。
(3) A data input stage:
first scanning signal line VSCAN1And a second scanning signal line VSCAN2The potential is kept unchanged, T1 is closed, T2 and T3 are still conducted, and data information is transmittedThe voltage signal on the signal line changes from 0 to VDATAIs transmitted to CS2At this time due to CS1、CS2The potential of the first node A is raised, the TD tube is restarted at the moment, and the potential of the first node A is reduced by a part of potential delta Vμ_TDThe value becomes:
Figure BDA0001700472700000122
herein omit the pair Δ Vμ_TDThe principle of the method is the same as that of the first embodiment.
(4) A light emitting stage:
first scanning signal line VSCAN1And a second scanning signal line VSCAN2The potential is simultaneously reversed to become high level and low level respectively, T2 and T3 are closed, CS2Completely separated from the circuit, the OLED starts to be charged through T1, TD, the potential of the OLED anode (namely the potential of the second node B) is raised and is V when stableOLEDThe current flowing through the OLED is the saturation current of the TD tube. The specific expression is as follows:
Figure BDA0001700472700000131
from the above equation, the OLED current is independent of the threshold voltage of the TFT, and thus can compensate for the threshold shift of the TFT. When the OLED degrades, VTH_OLEDAnd VOLEDBoth increase and their difference is approximately constant, so that the threshold degradation of the OLED can be compensated as well. In addition, the non-uniformity of the migration rate mu can be compensated to a certain extent, and the compensation effect is formed by delta Vμ_TDDetermine, and Δ Vμ_TDAgain determined by the data input time T described above.
Of course, in another embodiment, on the basis of the pixel circuit of this embodiment, the first scanning signal line V can be used in a manner similar to that of the above embodimentSCAN1Alternative power supply VDD。
Example six:
as shown in fig. 7, the present embodiment provides another pixel circuit, which is similar to the fifth embodimentIs distinguished from that of CS1Second terminal and power supply VDDAnd the working principle is the same as that of the fifth embodiment, and the description is omitted here.
Of course, in another embodiment, on the basis of the pixel circuit of this embodiment, the first scanning signal line V can be used in a manner similar to that of the above embodimentSCAN1Alternative power supply VDD。
Example seven:
as shown in fig. 8, the present embodiment provides another pixel circuit, which utilizes a mirror tube on the basis of the first embodiment to simplify the timing, and compared with other embodiments, only one kind of control timing is required, and the complexity of the peripheral IC can be greatly reduced.
The pixel circuit includes: the device comprises a light-emitting element D, a threshold voltage extraction module, a driving module and a mobility compensation module.
The threshold voltage extraction module at least comprises a storage capacitor CS1The driving module at least comprises a driving transistor TD; storage capacitor CS1Is connected to the first node a with the control electrode of the drive transistor TD for storing the data voltage during the data writing phase.
The threshold voltage extraction module is connected with the driving module and used for extracting the threshold voltage of the driving transistor TD in the threshold voltage extraction stage so as to realize threshold voltage compensation.
The driving module is connected to the light emitting element D, and is configured to drive the light emitting element D to emit light according to the data voltage stored on the first node a in the light emitting phase.
The mobility compensation module is respectively connected with the threshold voltage extraction module and the drive module, and is used for partially discharging the data voltage coupled to the first node A through the drive transistor TD in a data writing stage so as to extract mobility information and further effectively compensate invalidity of mobility.
In this embodiment, the mobility compensation module includes a second transistor T2, a third transistor T3, and a coupling capacitor CS2。
A control electrode of the second transistor T2 is for connection to a second scan signal line VSCAN2For the first poleTo be connected to the data signal line VDATAThe third pole is connected to the coupling capacitor CS2A first end of (a); coupling capacitor CS2Is connected to a first pole of a third transistor T3; a control electrode of the third transistor T3 for connecting to the second scan signal line VSCAN2And a second pole is connected to the first node a.
The second transistor T2 and the third transistor T3 are responsive to the second scan signal line V in the data input stageSCAN2A second scanning signal is input to the data signal line VDATAThe input data voltage is coupled to the first node a, and the data voltage coupled to the first node a is partially discharged through the driving transistor TD to extract mobility information.
In this embodiment, the first pole of the light emitting device D is connected to the second node B, and the second pole is connected to ground.
The driving module further includes a first transistor T1 and a fifth transistor T5; a control electrode of the first transistor T1 for connecting to the first scan signal line VSCAN1A first pole for connection to a supply line VDDThe second pole is connected to the first node A; a control electrode of the fifth transistor is connected to the first node A, and a first electrode is connected to the coupling capacitor CS2A second pole connected to a second node B; the control electrode of the drive transistor TD is connected to a first node A, the first electrode being for connection to a supply line VDDAnd a second pole is connected to a second node B.
In this embodiment, the storage capacitor CS1Is connected to a second node B.
Of course, in other embodiments, the storage capacitor CS1May also be used for grounding, or for connection to a power supply line V, in analogy with the above-described embodiments five to sixDDThe operation principle is not described herein. These solutions may also omit the fourth transistor T4.
In this embodiment, the threshold voltage extraction module further includes a fourth transistor T4, a control electrode of the fourth transistor T4 is connected to the second scan signal line VSCAN2A first pole connected to a second node B and a second pole for connecting to a first scanning signal line (V)SCAN1). Of course, in other embodiments, the second pole thereof may also be used for connection to the terminal V of low potentialL。
The working process of the pixel circuit provided by the embodiment is as follows:
it should be noted that, after the pixel circuit provided in this embodiment forms the display device by the array structure, the first scan signal V in fig. 8SCAN1Is more than the second scanning signal VSCAN2One sequence first. Therefore, V will be described in the following descriptionSCAN1Write as VSCAN(n-1)Will VSCAN2Writing VSCAN(n)。
(1) An initialization stage:
first scanning signal line VSCAN(n-1)Is high, the second scanning signal line VSCAN(n)Low, T1 tube open, VDDTwo capacitors C are connected through T1 tubeS1And CS2Charging is carried out, wherein the potential of the first node A is raised to a high potential VH。
(2) A threshold voltage extraction stage:
second scanning signal line VSCAN(n)Change from low level to high level, the first scanning signal line VSCAN(n-1)The transistor T1 is turned off when the high level is changed to the low level, the transistors T2, T3 and T4 are turned on, and the potential of the second node B is discharged to V through the transistor T4LIn addition, since the gate-source voltage across the driving transistor T5 is greater than the threshold voltage, T5 is turned on, and the potential of the first node a is discharged to V through T3, T5, and T4TH_T5+VLWhen the T5 tube and OLED are turned off, CS2The other end potential of the first and second electrodes is discharged to the data signal line V through the T2 tubeDATAThe initialization potential VREF of (1) is 0.
(3) A data input stage:
the potentials of the first and second scanning signal lines are kept unchanged, and the voltage signal on the data signal line is changed from 0 to VDATAIs transmitted to CS2At this time due to CS1、CS2The potential of the first node A is raised, the potential of the second node B is kept unchanged, the TD tube is turned on again, and the potential of the first node A is reduced by a part of the potential delta Vμ_T5Value ofThe following steps are changed:
Figure BDA0001700472700000151
at this time A, B the potential difference across it is CS1The voltage stored across is:
Figure BDA0001700472700000152
herein omit the pair Δ Vμ_TDThe principle of the method is the same as that of the first embodiment.
(4) A light emitting stage:
second scanning signal line VSCAN(n)Changing to low level, all switch tubes are closed, CS2Completely separated from the circuit, the OLED starts to be charged by TD, the anode potential (namely the second node B) of the OLED is raised and is V when being stableOLEDA, B the potential difference is always kept constant, and the current flowing through the OLED is the saturation current of the TD tube. The specific expression is as follows:
Figure BDA0001700472700000153
since T5, TD are mirror image tubes, an approximation can be considered as VTH_T5＝VTH_TDAssuming that the non-uniformities of the T5 tube and the TD tube can also be considered approximately equal, the above equation can be changed to:
Figure BDA0001700472700000161
from the above equation, the OLED current is independent of the threshold voltages of the TFT and the OLED, and thus the threshold shift of the TFT and the degradation of the OLED can be compensated. In addition, the non-uniformity of the mobility mu can be compensated to a certain extent, and the compensation effect is formed by delta Vμ_TDDetermine, and Δ Vμ_TDAgain determined by the data entry time T described above.
Fig. 9 is a timing diagram of signals related to the pixel circuit in this embodiment.
The pixel circuit provided by the embodiment has the advantages of the pixel circuit provided by the first embodiment.
Example eight:
as shown in fig. 10, correspondingly, the present embodiment provides a driving method of a pixel circuit, the pixel circuit being provided in any one of the above embodiments, the method including:
s1 initialization phase: the driving module initializes the control electrode of the driving transistor TD to a high potential.
S2 threshold voltage extraction phase: the drive transistor TD is turned on to discharge until turned off with its control electrode at a high potential; the threshold voltage extraction module extracts the threshold voltage of the driving transistor TD in the process that the driving transistor TD is changed from on to off and stores the threshold voltage in the storage capacitor CS1The above.
S3 data input stage: the data voltage is coupled to the first node a through the mobility compensation module and is partially discharged through the driving transistor TD to extract mobility information.
S4 luminescence phase: the light emitting element D emits light according to the data voltage stored on the first node a by being driven by the driving transistor TD.
Preferably, the driving method provided by this embodiment further includes: the anode of the light emitting element D is kept at a negative potential except for the light emitting period.
For the principle of the driving method provided by this embodiment, please refer to the first to seventh embodiments, which will not be described herein again.
Example nine:
as shown in fig. 11, correspondingly, the present embodiment provides a display device including: a pixel circuit matrix 101, a gate driving circuit 102, a data driving circuit 103, and a controller 104.
The pixel circuit matrix 101 includes pixel circuits provided in any of the above embodiments arranged in a matrix of n rows and m columns, where n and m are integers greater than 0.
The gate driver circuit 102 is used to generate and supply scan signals to the pixel circuit matrix 101 through scan signal lines.
The data driving circuit 103 is for generating and supplying data voltage signals representing gradation information to the pixel circuit matrix 101 through data signal lines.
The controller 104 is used to provide control timing to the gate driving circuit 102 and the data driving circuit 103.
As shown in fig. 12, a timing diagram of scan signals of the display device in this embodiment is shown, and the working principle of the display device is shown in the first to eighth embodiments. VSCAN2(n)The data voltages (i.e., data (n)) of all the pixels in the nth row are controlled to be written simultaneously.
In addition, the display device provided in this embodiment can be applied to electronic devices, such as a mobile phone, a tablet computer, a computer monitor, a digital television, and the like, which have the display device.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (9)

1. A pixel circuit, comprising: a light emitting element (D), a threshold voltage extraction module, a driving module, and a mobility compensation module;
the threshold voltage extraction module at least comprises a storage capacitor (C)S1) The driving module at least comprises a driving Transistor (TD); the storage capacitor (C)S1) Is connected to a first node (a) with a control electrode of the drive Transistor (TD) for storing a data voltage during a data writing phase;
the threshold voltage extraction module is connected with the drive module and is used for extracting the threshold voltage of the drive Transistor (TD) in a threshold voltage extraction stage;
the driving module is connected with the light-emitting element (D) and is used for driving the light-emitting element (D) to emit light according to the data voltage stored on the first node (A) in a light-emitting stage;
the mobility compensation module is respectively connected with the threshold voltage extraction module and the driving module and is used for partially discharging the data voltage coupled to the first node (A) through the driving Transistor (TD) in a data writing stage so as to extract mobility information;
the mobility compensation module includes a second transistor (T2), a third transistor (T3), and a coupling capacitor (C)S2) (ii) a A control electrode of the second transistor (T2) is connected to a second scan signal line (V)SCAN2) The first pole is used for connecting to a data signal line (V)DATA) A third pole connected to the coupling capacitor (C)S2) A first end of (a); the coupling capacitor (C)S2) Is connected to a first pole of a third transistor (T3); a control electrode of the third transistor (T3) is connected to the second scan signal line (V)SCAN2) A second pole connected to said first node (A); the second and third transistors (T2, T3) are responsive to the second scan signal line (V) during a data input stageSCAN2) A second scanning signal is input to connect the data signal lines (V)DATA) The input data voltage is coupled to the first node (a), and the data voltage coupled to the first node (a) is partially discharged through the driving Transistor (TD) to extract mobility information.
2. A pixel circuit according to claim 1, wherein a first pole of the light emitting element (D) is connected to a predetermined second node (B), and a second pole is connected to ground;
the driving module further comprises a first transistor (T1), a control electrode of the first transistor (T1) is used for being connected to a first scanning signal line (V)SCAN1) The first pole being intended to be connected to a supply line (V)DD) Or the first scanning signal line (V)SCAN1) A second pole connected to the first pole of the drive Transistor (TD); a second pole of the drive Transistor (TD) is connected to the second node (B).
3. A pixel circuit according to claim 1, wherein a first pole of the light emitting element (D) is connected to a predetermined second node (B), and a second pole is connected to ground;
the driving module further includes a first transistor (T1) and a fifth transistor (T5); a control electrode of the first transistor (T1) is connected to a first scanning signal line (V)SCAN1) The first pole being intended to be connected to a supply line (V)DD) Or the first scanning signal line (V)SCAN1) A second pole connected to said first node (A); a control electrode of the fifth transistor is connected to the first node (A), a first electrode is connected to the coupling capacitor (C)S2) A second pole connected to the second node (B); a control electrode of the drive Transistor (TD) is connected to the first node (A), a first electrode for connection to a supply line (V)DD) And a second pole is connected to the second node (B).
4. A pixel circuit as claimed in claim 2 or 3, characterized in that the storage capacitance (C)S1) Is connected to said second node (B), or is used for ground, or is used for connection to said power supply line (V)DD)。
5. The pixel circuit according to claim 2 or 3, wherein the threshold voltage extraction module further comprises a fourth transistor (T4), a control electrode of the fourth transistor (T4) being adapted to be connected to the second scan signal line (V)SCAN2) A first pole connected to the second node (B) and a second pole for connection to the first scanning signal line (V)SCAN1) Or the second pole for connection to a terminal of low potential (V)L)。
6. A method of driving a pixel circuit according to any one of claims 1 to 5, comprising:
an initialization stage: the drive module initializes a control electrode of the drive Transistor (TD) to a high potential;
a threshold voltage extraction stage: the drive Transistor (TD) is switched on and discharged until switched off when its control electrode is at a high potential; a threshold voltage extraction module extracts the drive transistor (T) during the transition from on to off of the drive Transistor (TD)D) And is stored in the storage capacitor (C)S1) The above step (1);
a data input stage: coupling a data voltage to the first node (a) through a mobility compensation module and partially discharging the data voltage stored on the first node (a) through the driving Transistor (TD) to extract mobility information;
a light emitting stage: the light emitting element (D) emits light according to the data voltage stored on the first node (A) under the driving of the driving Transistor (TD).
7. The method of claim 6, further comprising: the anode of the light-emitting element (D) is kept at a negative potential except for the light emission period.
8. A display device, comprising:
a pixel circuit matrix comprising pixel circuits according to any of claims 1-5 arranged in a matrix of n rows and m columns, n and m being integers greater than 0;
the grid driving circuit is used for generating and providing scanning signals for the pixel circuit matrix through scanning signal lines;
a data driving circuit for generating and supplying a data voltage signal representing gradation information to the pixel circuit matrix through a data signal line;
and a controller for providing control timing to the gate driving circuit and the data driving circuit.
9. An electronic apparatus characterized by comprising the display device according to claim 8.
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