CN110047437B - Pixel circuit, display panel and driving method of display panel - Google Patents

Pixel circuit, display panel and driving method of display panel Download PDF

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Publication number
CN110047437B
CN110047437B CN201910409975.2A CN201910409975A CN110047437B CN 110047437 B CN110047437 B CN 110047437B CN 201910409975 A CN201910409975 A CN 201910409975A CN 110047437 B CN110047437 B CN 110047437B
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transistor
module
pole
electrically connected
driving
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CN110047437A (en
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董栓柱
刘曼娜
朱晖
李永岗
朱正勇
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Kunshan Govisionox Optoelectronics Co Ltd
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Kunshan Govisionox Optoelectronics Co Ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3258—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the voltage across the light-emitting element
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0257—Reduction of after-image effects

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of El Displays (AREA)

Abstract

The invention discloses a pixel circuit, a display panel and a driving method of the display panel. The pixel circuit comprises a data voltage writing module, a driving module, a light emitting control module, a storage module and a sensing module, wherein the sensing module is electrically connected with the light emitting module. In the light-emitting stage, the sensing module senses the voltage of the light-emitting module and compensates the voltage of the light-emitting module, so that voltage signals compensated by the light-emitting modules in different pixel circuits are equal, the light-emitting brightness of the light-emitting modules in different pixel circuits is the same, and the display uniformity of the display panel is improved. In addition, the voltage of the light emitting module is compensated through the sensing module according to the preset voltage in the light emitting stage, so that the influence of the initial voltage of the driving module on the driving signal can be avoided, and the afterimage phenomenon of the display panel during the picture switching of different frames is improved.

Description

Pixel circuit, display panel and driving method of display panel
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a pixel circuit, a display panel and a driving method of the display panel.
Background
In the display process of an Organic Light-Emitting Diode (OLED) display panel, due to different initial gate-source voltages of driving transistors in different colors of sub-pixels in the OLED display panel, driving currents of the different colors of sub-pixels are different, so that the OLED display panel has poor Light-Emitting uniformity, and a pattern of an original image remains in the process of converting and displaying the image, thereby forming a short-term afterimage phenomenon and seriously affecting the display effect.
Disclosure of Invention
The invention provides a pixel circuit, a display panel and a driving method of the display panel, which are used for improving the display uniformity of the display panel and improving the afterimage.
In a first aspect, an embodiment of the present invention provides a pixel circuit, including a data voltage writing module, a driving module, a light emitting control module, a storage module, and an induction module;
the data voltage writing module is used for writing data voltage into the driving module;
the storage module is electrically connected with the driving module and used for storing the data voltage written into the driving module;
the driving module is used for outputting a driving signal according to the data voltage;
the sensing module is electrically connected with the light-emitting module and used for sensing the voltage of the light-emitting module in a light-emitting stage and compensating the voltage of the light-emitting module;
the light emitting control module is used for controlling the driving signal to be output to the light emitting module and controlling the light emitting module to emit light.
Optionally, the data voltage writing module includes a first transistor, the driving module includes a driving transistor, the light emitting module includes a light emitting diode, the light emitting control module includes a second transistor, the storage module includes a first capacitor, and the sensing module includes a third transistor; the pixel circuit further comprises a sensing end;
a gate of the first transistor is electrically connected to a first scan signal input terminal of the pixel circuit, a first pole of the first transistor is electrically connected to a data signal input terminal of the pixel circuit, and a second pole of the first transistor is electrically connected to a gate of the driving transistor and a first pole of the first capacitor;
a first pole of the driving transistor and a second pole of the first capacitor are electrically connected with a first power supply signal input end of the pixel circuit; a second pole of the driving transistor is electrically connected to a first pole of the second transistor and a first pole of the third transistor;
a second pole of the second transistor is electrically connected with the first pole of the light-emitting diode; the grid electrode of the second transistor is electrically connected with the light-emitting control signal input end of the pixel circuit;
the grid electrode of the third transistor is electrically connected with the light-emitting control signal input end; the second pole of the third transistor is electrically connected with the induction end;
and the second pole of the light-emitting diode is electrically connected with the second power supply signal input end of the pixel circuit.
Optionally, the pixel circuit further comprises a second capacitor; a first pole of the second capacitor is electrically connected to a second pole of the driving transistor, and a second pole of the second capacitor is electrically connected to a first pole of the third transistor.
Optionally, the data voltage writing module includes a first transistor, the driving module includes a driving transistor, the light emitting module includes a light emitting diode, the light emitting control module includes a second transistor and a fourth transistor, the storage module includes a first capacitor, and the sensing module includes a third transistor; the pixel circuit further comprises a fifth transistor and a sensing end;
a gate of the first transistor and a gate of the fifth transistor are electrically connected to a first scan signal input terminal of the pixel circuit, a first pole of the first transistor is electrically connected to a data signal input terminal of the pixel circuit, and a second pole of the first transistor and a first pole of the driving transistor are electrically connected to a first pole of the fourth transistor; a second pole of the fourth transistor and a second pole of the first capacitor are electrically connected to the first power signal input terminal;
a second pole of the driving transistor is electrically connected to a first pole of the second transistor, a first pole of the third transistor, and a first pole of the fifth transistor; the grid electrode of the driving transistor is electrically connected with the first pole of the first capacitor and the second pole of the fifth transistor; a second pole of the second transistor is electrically connected to a first pole of the light emitting diode, and a gate of the second transistor, a gate of the third transistor, and a gate of the fourth transistor are electrically connected to a light emission control signal input terminal of the pixel circuit; the second pole of the third transistor is electrically connected with the image sensing end; and the second pole of the light-emitting diode is electrically connected with the second power supply signal input end of the pixel circuit.
Optionally, the pixel circuit further includes a sixth transistor and a seventh transistor;
a gate of the sixth transistor and a gate of the seventh transistor are both electrically connected to the second scan signal input terminal of the pixel circuit, and a first pole of the sixth transistor and a first pole of the seventh transistor are both electrically connected to the reference signal input terminal of the pixel circuit; a second pole of the sixth transistor is electrically connected to the first pole of the light emitting diode, and a second pole of the seventh transistor is electrically connected to the gate of the driving transistor.
In a second aspect, an embodiment of the present invention further provides a display panel, including a signal acquisition and processing unit and the pixel circuit provided in any embodiment of the present invention;
the signal acquisition and processing unit is electrically connected with the plurality of sensing modules of the pixel circuit through sensing lines and is used for acquiring the voltage of the light emitting modules of the pixel circuit through the sensing lines and the sensing modules and providing voltage compensation signals for the light emitting modules of the pixel circuit through the sensing lines and the sensing modules.
Optionally, the display panel further includes a first power supply signal line and a data signal line;
the data signal line is electrically connected with the data voltage writing module, and the first power signal line is electrically connected with the driving module and the storage module; the sensing line is different from the data signal line and/or the first power signal line in a layer, and at least partially overlaps.
Optionally, the material of the sensing line is MO/Al/MO, TI/Al/TI or Cu.
In a third aspect, an embodiment of the present invention further provides a driving method of a display panel, for driving the display panel provided in any embodiment of the present invention; the method comprises the following steps:
in the data writing stage, the data voltage writing module in the pixel circuits sequentially writes data voltages into the driving module, and the storage module stores the data voltages;
in the light emitting stage, the light emitting control module in the pixel circuits controls the driving signal output by the driving module to be output to the light emitting module, the light emitting control module controls the sensing module to sense the voltage of the light emitting module, the signal acquisition and processing unit of the display panel acquires the voltage of the light emitting module of the pixel circuits through the sensing module and provides a voltage compensation signal for the light emitting module of the pixel circuits through the sensing module, and the light emitting module emits light.
Optionally, the pixel circuit further includes a threshold compensation module, and at the time of the data writing phase, the threshold compensation module further includes:
the threshold compensation module performs threshold compensation on the data voltage written into the driving module.
According to the technical scheme of the embodiment of the invention, the pixel circuit comprises a data voltage writing module, a driving module, a light emitting control module, a storage module and a sensing module, wherein the sensing module is electrically connected with the light emitting module. In the light-emitting stage, the sensing module senses the voltage of the light-emitting module and compensates the voltage of the light-emitting module according to the preset voltage, so that voltage signals compensated by the light-emitting modules in different pixel circuits are equal, the light-emitting brightness of the light-emitting modules in different pixel circuits is the same, and the display uniformity of the display panel is improved. In addition, the voltage of the light emitting module is compensated through the sensing module according to the preset voltage in the light emitting stage, so that the influence of the initial voltage of the driving module on the driving signal can be avoided, and the afterimage phenomenon of the display panel during the picture switching of different frames is improved.
Drawings
Fig. 1 is a schematic circuit structure diagram of a pixel circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of another pixel circuit according to an embodiment of the present invention;
FIG. 3 is a timing diagram of the pixel circuit of FIG. 2;
fig. 4 is a schematic circuit diagram of another pixel circuit according to an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of another pixel circuit according to an embodiment of the present invention;
fig. 6 is a schematic circuit diagram of another pixel circuit according to an embodiment of the present invention;
FIG. 7 is a timing diagram of the pixel circuit of FIG. 6;
fig. 8 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 9 is a schematic diagram illustrating a film distribution of a display panel according to an embodiment of the invention;
FIG. 10 is a schematic cross-sectional view taken along section AA' of FIG. 9;
fig. 11 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Fig. 12 is a flowchart illustrating a driving method of a display panel according to an embodiment of the invention;
fig. 13 is a flowchart of another driving method of a display panel according to an embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the prior art, the initial gate-source voltages of the driving transistors in the sub-pixels of different colors in the OLED display panel are different, so that the driving currents of the sub-pixels of different colors are different, and the light emitting uniformity of the OLED display panel is poor. In addition, when the OLED display panel switches the pictures, one picture before switching does not disappear immediately, but gradually disappears along with the next picture, so that the short-term afterimage phenomenon exists on the OLED display panel. For example, the OLED display panel displays a black-and-white grid image, the luminance of the pixel unit corresponding to the black grid image is low, and the gate-source voltage of the driving transistor in the pixel unit corresponding to the black grid image is low. The luminance of the pixel unit corresponding to the white chess grids is high, and the grid-source voltage of the driving transistor in the pixel unit corresponding to the white chess grids is high. When the OLED display panel is switched from a picture of a black and white chess grid to a gray picture, the same data voltage is written into all the pixel circuits in the display panel, and the grid source voltage of the driving transistor of the pixel unit corresponding to the gray picture is lower than the grid source voltage of the driving transistor of the pixel unit corresponding to the white chess grid and is simultaneously higher than the grid source voltage of the driving transistor of the pixel unit corresponding to the black chess grid. At this time, the gate-source voltage of the driving transistor of the pixel cell corresponding to the black checkered grid is changed from low to high, and the light emission luminance is changed from dark to bright, and the gate-source voltage of the driving transistor of the pixel cell corresponding to the white checkered grid is changed from high to low, and the light emission luminance is changed from bright to dark. Due to the hysteresis effect of the driving transistor, when the gate-source voltage of the driving transistor of the pixel unit corresponding to the black chess grids is changed from low to high, the gate-source voltage of the driving transistor is smaller than the gate-source voltage of the driving transistor corresponding to the gray picture in a short time, and after the picture of the pixel unit corresponding to the black chess grids is changed into the gray picture, the light-emitting brightness is darker than the light-emitting brightness corresponding to the gray picture. When the grid-source voltage of the driving transistor of the pixel unit corresponding to the white chess grids is changed from high to low, the grid-source voltage of the driving transistor is larger than that of the driving transistor corresponding to the gray picture in a short time, and after the picture of the pixel unit corresponding to the white chess grids is changed into the gray picture, the luminous brightness is brighter than that corresponding to the gray picture, so that a short-term ghost phenomenon on the OLED display panel is caused, and the display effect of the display panel is seriously influenced.
In view of the above problems, embodiments of the present invention provide a pixel circuit to improve the uniformity of display of a display panel and to improve the image sticking phenomenon.
Fig. 1 is a schematic circuit structure diagram of a pixel circuit according to an embodiment of the present invention, and as shown in fig. 1, the pixel circuit includes a data voltage writing module 10, a driving module 20, a light emitting module 30, a light emitting control module 40, a storage module 50, and a sensing module 60.
The data voltage writing module 10 is used for writing a data voltage to the driving module 20. The storage module 50 is electrically connected to the driving module 20 and is used for storing the data voltage written into the driving module 20. The driving module 20 is configured to output a driving signal according to the data voltage. The sensing module 60 is electrically connected to the light emitting module 30, and is configured to sense a voltage of the light emitting module 30 in a light emitting phase, so as to compensate the voltage of the light emitting module 30. The light emitting control module 40 is used for controlling the driving signal to be output to the light emitting module and controlling the light emitting module 30 to emit light.
Illustratively, as shown in fig. 1, the control terminal of the data voltage writing module 10 is electrically connected to the first Scan signal input terminal Scan1 for inputting the first Scan signal, the first terminal of the data voltage writing module 10 is electrically connected to the data signal input terminal Vdata for inputting the data voltage, and the second terminal of the data voltage writing module 10 is electrically connected to the control terminal of the driving module 20. The control end of the driving module 20 is electrically connected to the second end of the memory module 50, the first end of the driving module 20 and the first end of the memory module 50 are electrically connected to the first power signal input end Vdd of the pixel circuit, the second end of the driving module 20 is electrically connected to the first end of the light emitting control module 40 and the first end of the sensing module 60, the control end of the light emitting control module 40 and the control end of the sensing module 60 are electrically connected to the light emitting control signal input end E1 of the pixel circuit, the second end of the light emitting control module 40 is electrically connected to the first end of the light emitting module 30, and the second end of the light emitting module 30 is electrically connected to the second power signal input end Vss of the pixel circuit. In the working process of the pixel circuit, in the data writing phase, the first Scan signal input by the first Scan signal input terminal Scan1 controls the data voltage writing module 10 to write the data voltage into the driving module 20, and the storage module 50 stores the data voltage. In the light emitting phase, the light emitting control signal input from the light emitting control signal input terminal E1 controls the light emitting control module 40 to output the driving signal to the light emitting module 30. Meanwhile, the sensing module 60 senses the voltage of the light emitting module 30, and when the sensing result shows that the voltage of the light emitting module 30 is not equal to the preset voltage, the sensing module 60 compensates the voltage of the light emitting module 30, so that the voltage of the light emitting module 30 is equal to the preset voltage, and the light emitting module 30 emits light under the compensated voltage signal.
During the process of the light emitting module 30 emitting light, the light emitting brightness of the light emitting module 30 is proportional to the current flowing through the light emitting module 30. And the current flowing through the light emitting module 30 is related to the voltage of the driving module 20. When the voltage at the second terminal of the driving module 20 is VNWhen the first power signal input terminal Vdd inputs the first power signal input terminal Vdd is Vdd, and the data signal input terminal Vdata inputs the data signal Vdata, the voltage of the control terminal of the driving module 20 is vd when the data writing phase is finishedata is used. The current I ═ K (vdd + V) at the light-emitting module 30N-vdata)2/2. Where vdd is a constant and K is a coefficient. Generally, the voltage V at the second end of the driving module 20NZero, the current I ═ K (vdd-vdata) on the light emitting module 302And/2, the light-emitting brightness of the light-emitting module 30 corresponds to the data signal vdata. When the voltage of the control terminal of the driving module 20 changes due to leakage current or the like, the voltage of the control terminal of the driving module 20 is vdata + Δ v, where Δ v is a change value of the voltage of the control terminal of the driving module 20. The current I ≠ K (vdd-vdata) forming the light emitting module 302/2, the voltage V at the second end of the driving module 20 can be sensed by the sensing module 60NMake compensation to VNIs equal to the change value Δ V of the control terminal voltage of the driving module 20, and the current I ═ K (vdd + V) of the light emitting module 30 is formedN-(vdata+Δv))2/2＝I＝K(vdd+Δv-(vdata+Δv))2/2＝K(vdd-vdata)2And/2, the light-emitting brightness of the light-emitting module 30 corresponds to the data signal vdata, so that the phenomenon that the light-emitting brightness of the light-emitting module 30 changes due to the voltage change of the control end of the driving module 20 is avoided. Voltage V at the second end of the sensing module 60 to the driving module 20NWhen the compensation is performed, the sensing module 60 senses the voltage at the second end of the driving module 20, and performs the compensation according to an actual difference between the sensed voltage at the second end of the driving module 20 and a preset voltage. The voltage at the second end of the driving module 20 is the voltage of the light emitting module 30, so that the sensing module 60 can sense the voltage of the light emitting module 30 to sense the voltage at the second end of the driving module 20. The display panel comprises a plurality of pixel circuits, the voltages of the compensated light emitting modules 30 are equal by setting the preset voltages in the pixel circuits, the currents passing through the light emitting modules 30 are equal, and when the display panel displays, the light emitting brightness of the light emitting modules 30 of different pixel circuits is the same, so that the display uniformity of the display panel can be improved.
In the above process, the current on the light emitting module 30 is related to the voltage of the control terminal of the driving module 20. In the data writing phase, the control terminal voltage of the driving module 20 changes from vdata of the previous frame to vdata of the current frame. When a frame on the display panel is written into the drive of different pixel circuitsWhen the data voltages of the driving modules 20 are different, the initial voltages of the control terminals of the driving modules 20 in different pixel circuits are different. When the current frame of the display panel is displayed, in the data writing stage, the data voltage writing module 10 writes the same data voltage into the driving module 20, the driving module 20 starts to write the data voltage from different initial voltages, and the driving signals output by the driving module 20 are different. In the light emitting stage, the voltage of the light emitting module 30 is compensated by the sensing module 60 according to the preset voltage, so that the current I of the light emitting module 30 in different pixel circuits is K (vdd-vdata)2And/2, the light-emitting brightness of the light-emitting module 30 corresponds to the compensated voltage signal, and the light-emitting brightness of the light-emitting modules 20 in different pixel circuits is the same, so that the influence of the initial voltage of the driving module 20 on the driving signal is avoided, and the afterimage phenomenon of the display panel during the picture switching of different frames is improved.
In general, the preset voltage may be a voltage value preset in advance, for example, a difference between vdd-vdata and an actual voltage value at the second end of the driving module 20, so that compensation for a transformation change at the control end of the driving module 20 may be achieved, and the light emitting module 30 may display according to the data voltage. Alternatively, the preset voltage may be an average value of the voltages of the sensing modules 60 of the plurality of pixel circuits sensing the light emitting module 30. In the display area of the display panel, a plurality of sub-display areas may be selected, each sub-display area includes a plurality of pixel circuits, and the average value of the voltages of the light emitting modules 30 sensed by the sensing modules 60 of the pixel circuits in all the sub-display areas is taken as the preset voltage of the pixel circuit.
According to the technical scheme of the embodiment, the pixel circuit comprises a data voltage writing module, a driving module, a light emitting control module, a storage module and a sensing module, wherein the sensing module is electrically connected with the light emitting module. In the light-emitting stage, the sensing module senses the voltage of the light-emitting module and compensates the voltage of the light-emitting module according to the preset voltage, so that voltage signals compensated by the light-emitting modules in different pixel circuits are equal, the light-emitting brightness of the light-emitting modules in different pixel circuits is the same, and the display uniformity of the display panel is improved. In addition, the voltage of the light emitting module is compensated through the sensing module according to the preset voltage in the light emitting stage, so that the influence of the initial voltage of the driving module on the driving signal can be avoided, and the afterimage phenomenon of the display panel during the picture switching of different frames is improved.
Based on the above technical solution, fig. 2 is a schematic circuit structure diagram of another pixel circuit according to an embodiment of the present invention. As shown in fig. 2, the data voltage writing module 10 includes a first transistor T1, the driving module 20 includes a driving transistor Tdr, the light emitting module 30 includes a light emitting diode D1, the light emitting control module 40 includes a second transistor T2, the storage module 50 includes a first capacitor C1, and the sensing module 60 includes a third transistor T3. The pixel circuit further comprises a sensing terminal Sense.
A gate of the first transistor T1 is electrically connected to the first Scan signal input terminal Scan1 of the pixel circuit, a first pole of the first transistor T1 is electrically connected to the data signal input terminal Vdata of the pixel circuit, and a second pole of the first transistor T1 is electrically connected to the gate of the driving transistor Tdr and the first pole of the first capacitor C1. A first pole of the driving transistor Tdr is electrically connected to a second pole of the first capacitor C1 and the first power signal input terminal Vdd of the pixel circuit, a second pole of the driving transistor Tdr is electrically connected to a first pole of the second transistor T2, and a first pole of the third transistor T3 is electrically connected to a second pole of the second transistor T2 and the first pole of the light emitting diode D1. The gate of the second transistor T2 is electrically connected to the light emission control signal input terminal E1 of the pixel circuit. A gate of the third transistor T3 is electrically connected to the light emission control signal input terminal E1. The second pole of the third transistor T3 is electrically connected to the sensing terminal Sense of the pixel circuit. A second pole of the light emitting diode D1 is electrically connected to a second power signal input terminal Vss of the pixel circuit.
Fig. 3 is a timing diagram of the pixel circuit corresponding to fig. 2. Now, referring to fig. 2 and fig. 3, the operation principle of the pixel circuit shown in fig. 2 will be described by taking the P-type transistor as an example.
Referring to fig. 3, the Scan1 is a timing sequence of the first Scan signal inputted from the first Scan signal input terminal Scan1, and E1 is a timing sequence of the first light-emitting control signal inputted from the first light-emitting control terminal E1.
In the data writing phase T1, scan1 is low, e1 is high, the first transistor T1 is turned on, the data signal is written to the gate of the driving transistor Tdr, and the data signal is stored through the first capacitor C1. At this time, the driving transistor Tdr is turned on.
In the light emitting period T2, the scan1 is at a high level, the e1 is at a low level, and the second transistor T2 and the third transistor T3 are turned on. The driving transistor Tdr outputs a driving signal to the N point. The sensing terminal Sense of the pixel circuit senses the voltage at the N point through the third transistor T3 and compares the sensed voltage with a preset voltage. When the sensed voltage at the point N is not equal to the preset voltage, the sensing terminal Sense outputs the preset voltage to compensate the voltage at the point N, so that the voltage at the point N is equal to the preset voltage. The compensated voltage is output to the led D1 through the second transistor T2, and the luminance of the led D1 corresponds to the compensated voltage.
In the display panel, each pixel circuit includes the third transistor T3 and the Sense terminal Sense, so that the N-point voltage compensation can be performed on all the pixel circuits in the display panel, so that the different light emitting diodes D1 have the same light emitting brightness, and the display uniformity of the display panel is improved. Also, the voltage of the light emitting diode D1 is compensated by the third transistor T3 according to a preset voltage during the light emitting period, so that the current I of the light emitting diode D1 in the pixel circuit becomes K (vdd-vdata)2And/2, the phenomenon of image sticking caused by different grid voltages of the driving transistor Tdr after the data writing stage due to different initial voltages of the grid of the driving transistor Tdr can be avoided, so that the image sticking phenomenon of the display panel during the picture switching of different frames is improved.
On the basis of the above technical solutions, fig. 4 is a schematic circuit structure diagram of another pixel circuit according to an embodiment of the present invention. As shown in fig. 4, the pixel circuit further includes a second capacitor C2. A first pole of the second capacitor C2 is electrically connected to the second pole of the driving transistor Tdr, and a second pole of the second capacitor C2 is electrically connected to the first pole of the third transistor T3.
Specifically, as shown in fig. 4, the second capacitor C2 is connected in series between the N point and the third transistor T3. When the third transistor T3 is turned on and the sensing terminal Sense senses the voltage at the N-point through the third transistor T3, the second capacitor C2 can prevent the voltage at the N-point from leaking to the sensing terminal Sense through the third transistor T3, thereby avoiding the problem of poor display uniformity of the display panel caused by the inconsistent voltage output to the light emitting diode D1 through the second transistor T2 in different pixel circuits.
Fig. 5 is a schematic circuit structure diagram of another pixel circuit according to an embodiment of the present invention. As shown in fig. 5, the data voltage writing module 10 includes a first transistor T1, the driving module 20 includes a driving transistor Tdr, the light emitting module 30 includes a light emitting diode D1, the light emitting control module 40 includes a second transistor T2 and a fourth transistor T4, the storage module 50 includes a first capacitor C1, the sensing module 60 includes a third transistor T3, and the pixel circuit further includes a fifth transistor T5 and a sensing terminal Sense.
A gate of the first transistor T1 and a gate of the fifth transistor T5 are electrically connected to a first Scan signal input terminal Scan1 of the pixel circuit, a first pole of the first transistor T1 is electrically connected to a data signal input terminal Vdata of the pixel circuit, a second pole of the first transistor T1 and a first pole of the driving transistor Tdr are electrically connected to a first pole of the fourth transistor T4, and a second pole of the fourth transistor T4 and a second pole of the first capacitor C1 are electrically connected to a first power supply signal input terminal Vdd. The second pole of the driving transistor Tdr is electrically connected to the first pole of the second transistor T2, the first pole of the third transistor T3, and the first pole of the fifth transistor T5. The gate of the driving transistor Tdr is electrically connected to the first pole of the first capacitor C1 and the second pole of the fifth transistor T5. The second pole of the second transistor T2 is electrically connected to the first pole of the light emitting diode D1, and the gate of the second transistor T2, the gate of the third transistor T3, and the gate of the fourth transistor T4 are electrically connected to the light emission control signal input terminal E1 of the pixel circuit. The second pole of the third transistor T3 is electrically connected to the sensing terminal Sense. A second pole of the light emitting diode D1 is electrically connected to a second power signal input terminal Vss of the pixel circuit.
Fig. 3 is a timing diagram of the pixel circuit corresponding to fig. 5. Now, referring to fig. 3 and 5, the operation principle of the pixel circuit shown in fig. 5 will be described by taking the P-type transistor as an example
In the data writing phase T1, the scan1 is at a low level, the e1 is at a high level, the first transistor T1 and the fifth transistor T5 are turned on, the data voltage is written to the gate of the driving transistor Tdr through the first transistor T1 and the fifth transistor T5, and the data voltage is stored through the first capacitor C1. Until the gate voltage of the driving transistor Tdr is vdata-vth, the driving transistor Tdr is turned off. Where vth is the threshold voltage of the driving transistor Tdr. Therefore, in the data writing phase t1, the pixel circuit completes the writing of the data voltage and the threshold compensation of the driving transistor Tdr.
In the lighting period T2, the scan1 is at a high level, the e1 is at a low level, the first transistor T1 and the fifth transistor T5 are turned off, the second transistor T2, the third transistor T3 are turned on, and the fourth transistor T4 is turned on. The driving transistor Tdr outputs a driving current to the N point. The sensing terminal Sense of the pixel circuit senses the voltage at the N point through the third transistor T3 and compares the sensed voltage with a preset voltage. When the sensed voltage at the point N is not equal to the preset voltage, the sensing terminal Sense outputs the preset voltage to compensate the voltage at the point N, so that the voltage at the point N is equal to the preset voltage. The compensated voltage is output to the light emitting diode D1 through the second transistor T2, and the light emitting brightness of the light emitting diode D1 corresponds to the compensated voltage.
In addition, the fifth transistor T5 may be a double gate transistor, and a leakage current of the gate of the driving transistor Tdr through the fifth transistor T5 may be reduced. Similarly, the pixel circuit may further include a second capacitor C2 for preventing the N-point voltage from leaking to the sensing terminal Sense through the third transistor T3, so as to avoid the problem of poor display uniformity of the display panel caused by the voltage output to the led D1 through the second transistor T2 in different pixel circuits being inconsistent.
Fig. 6 is a schematic circuit structure diagram of another pixel circuit according to an embodiment of the present invention. As shown in fig. 6, the pixel circuit further includes a sixth transistor T6 and a seventh transistor T7.
A gate of the sixth transistor T6 and a gate of the seventh transistor T7 are electrically connected to the second Scan signal input terminal Scan2 of the pixel circuit, a first pole of the sixth transistor T6 and a first pole of the seventh transistor T7 are electrically connected to the reference signal input terminal Vref of the pixel circuit, a second pole of the sixth transistor T6 is electrically connected to a first pole of the light emitting diode D1, and a second pole of the seventh transistor T7 is electrically connected to a gate of the driving transistor Tdr.
Fig. 7 is a timing diagram corresponding to the pixel circuit of fig. 6. The operating principle of the pixel circuit of fig. 6 will now be described with reference to fig. 6 and 7.
Specifically, in fig. 7, Scan1 is the timing of the first Scan signal inputted from the first Scan signal input terminal Scan1, Scan2 is the timing of the second Scan signal inputted from the second Scan signal input terminal Scan2, and E1 is the timing of the first light emission control signal inputted from the first light emission control terminal E1.
In the reset phase T3, the scan1 is at a high level, the scan2 is at a low level, the e1 is at a high level, the sixth transistor T6 and the seventh transistor T7 are turned on, the reference voltage signal input terminal Vref inputs a reference voltage signal to the anode of the light emitting diode D1 and the gate of the driving transistor Tdr, and the anode of the light emitting diode D1 and the gate of the driving transistor Tdr are reset. At this time, the driving transistor Tdr is turned on.
In the data writing period T4, the scan1 is low, the scan2 is high, the e1 is high, the sixth transistor T6 and the seventh transistor T7 are turned off, the first transistor T1 and the fifth transistor T5 are turned on, and at the end of the reset period T3, the driving transistor Tdr is turned on. The data signal is written to the gate of the driving transistor Tdr through the first transistor T1 and the fifth transistor T5, and is stored through the first capacitor C1. Until the gate voltage of the driving transistor Tdr is vdata-vth, the driving transistor Tdr is turned off. Where vth is the threshold voltage of the driving transistor Tdr. Therefore, in the data writing phase t1, the pixel circuit completes the writing of the data voltage and the threshold compensation of the driving transistor Tdr.
In the light emitting period T5, the scan1 is at a high level, the scan2 is at a high level, the e1 is at a low level, the first transistor T1, the fifth transistor T5, the sixth transistor T6, and the seventh transistor T7 are turned off, the second transistor T2, the third transistor T3 are turned on, and the fourth transistor T4 is turned on. The driving transistor Tdr outputs a driving signal to the N point. The sensing terminal Sense of the pixel circuit senses the voltage at the N point through the third transistor T3 and compares the sensed voltage with a preset voltage. When the sensed voltage at the point N is not equal to the preset voltage, the sensing terminal Sense outputs the preset voltage to compensate the voltage at the point N, so that the voltage at the point N is equal to the preset voltage. The compensated voltage is output to the light emitting diode D1 through the second transistor T2, and the light emitting diode D1 emits light under the compensated voltage.
Since the seventh transistor T7 is electrically connected to the gate of the driving transistor Tdr, there may be a leakage current when the seventh transistor T7 is turned off, and after the data writing period T4, the voltage at the gate of the driving transistor Tdr drops in the form of a leakage current through the seventh transistor T7. By arranging the seventh transistor T7 as a dual-gate transistor, the leakage current of the seventh transistor T7 can be reduced, and further, the change of the voltage of the gate of the driving transistor Tdr due to the leakage current can be reduced, so that the difference of the voltages of the gates of the driving transistors Tdr in different pixel circuits can be reduced, the time for writing the voltage of the gate of the driving transistor Tdr to the same voltage is reduced, and the time for the display panel image sticking phenomenon is shortened.
The embodiment of the invention also provides a display panel. Fig. 8 is a schematic structural diagram of a display panel according to an embodiment of the present invention. As shown in fig. 8, the display panel includes a signal collecting and processing unit 110 and a plurality of pixel circuits 120 provided in any embodiment of the present invention.
The signal collecting and processing unit 110 is located in the non-display area 11, and the pixel circuit 120 is located in the display area 12. The signal collecting and processing unit 110 is electrically connected to the sensing modules of the plurality of pixel circuits 120 through the sensing line 111, and is configured to collect the voltage of the light emitting modules of the pixel circuits through the sensing line 111 and the sensing modules, and provide voltage compensation signals to the light emitting modules of the pixel circuits through the sensing line 111 and the sensing modules.
Specifically, the display panel further includes data lines 112 and scan lines 113. When the pixel circuits operate, the data lines 112 supply data signals to the pixel circuits, and the scan lines 113 supply scan signals to the pixel circuits. The sensing module may include a transistor, the transistor is turned on in a light emitting stage, the signal collecting and processing unit 110 collects the voltage of the light emitting module of the pixel circuit 120 through the transistor, the signal collecting and processing unit 110 compares the collected voltage with a preset voltage, and when the collected voltage is not equal to the preset voltage, the signal collecting and processing unit 110 forms a voltage compensation signal and provides the voltage compensation signal to the light emitting module of the pixel circuit 120 through the transistor, so that the light emitting module emits light.
Fig. 9 is a schematic view illustrating a film distribution of a display panel according to an embodiment of the invention, and fig. 10 is a schematic view illustrating a cross-sectional structure of fig. 9 taken along an AA' cross section. As shown in fig. 8 to 10, the display panel further includes a first power signal line 114 and a data signal line 112.
The data signal line 112 is electrically connected to the data voltage writing module, the first power signal line 114 is electrically connected to the driving module and the memory module, and the sensing line 111 is at least partially overlapped with the data signal line 112 and/or the first power signal line 114 in different layers.
Specifically, the display panel includes a substrate 115, and the substrate 115 is provided with pixel circuits and wirings, such as a data signal line 112, a scan signal line 113, and a first power supply signal line 114. In general, a semiconductor active layer 117, a gate insulating layer (not shown in fig. 9), a gate layer, an interlayer insulating layer, and a source drain layer are sequentially stacked on the substrate 115. The grid layer is arranged on the first metal layer, and the source drain layer is arranged on the second metal layer. The first metal layer may also be formed with a scan signal line 113 and a light emission control signal line 118, and the second metal layer may also be formed with a data signal line 112 and a first power signal line 114 in general. The first metal layer and the second metal layer are insulated by an interlayer insulating layer. Because the routing on the second metal layer is dense, the remaining space is small, the sensing line 111 can be disposed on the third metal layer and at least partially overlapped with the routing in the second metal layer, so as to reduce the area occupied by the pixel circuit. I.e. on the side of the second metal layer remote from the substrate 115, a first insulating layer and a third metal layer are further included, the third metal layer forming the sensing line 111. Exemplarily, as shown in fig. 10, the sensing line 111 and the first power signal line 114 are insulated by the first insulating layer 116, and there is a partial overlap of the projection of the sensing line 111 and the first power signal line 114 in a direction perpendicular to the substrate 115, so that an area occupied by the first power signal line 114 and the sensing line 111 can be reduced. In addition, the extending direction of the first power signal line 114 includes a plurality of pixel circuits arranged in columns, the extending direction of the sensing line 111 can be parallel to the extending direction of the first power signal line 114, and the voltages of the driving modules in different pixel circuits can be sequentially sensed and stored along the extending direction of the first power signal line 114, so that the display panel can compare with the voltages of the driving modules in the next frame of display screen and compensate the voltages. In addition, the semiconductor active layer 117 further includes an AA ' portion (i.e., along the cross section of the AA ' portion in fig. 9) located on the side of the third transistor T3 away from the driving transistor Tdr, and the AA ' portion is electrically connected to the sensing line 111 through the via 130, so that the sensing line 111 can be regularly wired, the length of the sensing line 111 can be reduced, and the line loss of the sensing line 111 can be reduced. In general, the material of the sensing line 111 may be a material with relatively high conductivity, such as MO/Al/MO, TI/Al/TI or Cu, to reduce the resistance of the sensing line 111 as much as possible.
The sensing module may be a third transistor T3, and the third transistor T3 is formed by overlapping the semiconductor active layer 117 and the first power signal line 1114. A gate of the third transistor T3 is electrically connected to the light emission control signal line 118, a first pole of the third transistor T3 is electrically connected to a second pole of the driving transistor Tdr through the first power signal line 114, and a second pole of the third transistor T3 is electrically connected to the sensing line 111 through the via 130. The third transistor T3 is controlled to be turned on or off by the light emission control signal line 118.
According to the technical scheme of the embodiment of the invention, the display panel comprises a signal acquisition and processing unit and a pixel circuit, wherein the pixel circuit comprises a driving module and a sensing module. In the display process of the display panel, the induction module of the pixel circuit is conducted in the light-emitting stage, so that the signal acquisition and processing unit acquires the voltage of the light-emitting module of the pixel circuit through the induction line and the induction module and provides a voltage compensation signal for the light-emitting module of the pixel circuit through the induction line and the induction module, the light-emitting brightness of the light-emitting module in the display panel is the same, and the uniformity of the display panel is improved. In addition, the voltage of the light emitting module is compensated through the signal acquisition and processing unit in the light emitting stage, so that the influence of the initial voltage of the driving module in the pixel circuit on the driving signal can be avoided, and the afterimage phenomenon of the display panel during the picture switching of different frames is improved.
The embodiment of the invention also provides a display device. Fig. 11 is a schematic structural diagram of a display device according to an embodiment of the present invention. As shown in fig. 11, the display device 100 includes a display panel 101 provided in any embodiment of the present invention.
The embodiment of the invention also provides a driving method of the display panel, which is used for driving the display panel provided by any embodiment of the invention. Fig. 12 is a flowchart of a driving method of a display panel according to an embodiment of the invention. As shown in fig. 12, the driving method of the display panel includes:
s210, in a data writing stage, data voltage is written into the driving module by the data voltage writing module in the pixel circuits in sequence, and the data voltage is stored by the storage module.
Specifically, when the display panel includes pixel circuits arranged in an array, the pixel circuits perform a data writing stage row by row, so that the driving modules of the plurality of pixel circuits write data voltages.
And S220, in a light-emitting stage, a light-emitting control module in the pixel circuits controls a driving signal output by the driving module to be output to the light-emitting module, the light-emitting control module controls the sensing module to sense the voltage of the light-emitting module, a signal acquisition and processing unit of the display panel acquires the voltages of the light-emitting modules of the pixel circuits through the sensing module and provides a voltage compensation signal for the light-emitting modules of the pixel circuits through the sensing module, and the light-emitting modules emit light.
According to the technical scheme of the embodiment of the invention, in the driving process of the display panel, in the light-emitting stage, the light-emitting control module in the pixel circuits controls the driving signals output by the driving module to be output to the light-emitting module, the light-emitting control module controls the sensing module to sense the voltage of the light-emitting module, the signal acquisition and processing unit of the display panel acquires the voltages of the light-emitting modules of the pixel circuits through the sensing module and provides voltage compensation signals for the light-emitting modules of the pixel circuits through the sensing module, so that the light-emitting brightness of the light-emitting modules in the display panel is the same, and the uniformity of the display panel is improved. In addition, the voltage of the light emitting module is compensated through the signal acquisition and processing unit in the light emitting stage, so that the influence of the initial voltage of the driving module in the pixel circuit on the driving signal can be avoided, and the afterimage phenomenon of the display panel during the picture switching of different frames is improved.
In addition, the pixel circuit may further include a threshold compensation module. Fig. 13 is a flowchart of another driving method of a display panel according to an embodiment of the invention. As shown in fig. 13, the driving method of the display panel includes:
and S310, in a data writing stage, data voltage is written into the driving module by the data voltage writing module in the pixel circuits in sequence, and the data voltage is stored by the storage module. The threshold compensation module performs threshold compensation on the data voltage written into the driving module.
And S320, in a light-emitting stage, a light-emitting control module in the pixel circuits controls a driving signal output by the driving module to be output to the light-emitting module, the light-emitting control module controls the sensing module to sense the voltage of the light-emitting module, a signal acquisition and processing unit of the display panel acquires the voltages of the light-emitting modules of the pixel circuits through the sensing module and provides a voltage compensation signal for the light-emitting modules of the pixel circuits through the sensing module, and the light-emitting modules emit light.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (10)

1. A pixel circuit is characterized by comprising a data voltage writing module, a driving module, a light emitting control module, a storage module and an induction module;
the data voltage writing module is used for writing data voltage into the driving module;
the storage module is electrically connected with the driving module and used for storing the data voltage written into the driving module;
the driving module is used for outputting a driving signal according to the data voltage;
the sensing module is electrically connected with the light-emitting module, the control end of the sensing module is electrically connected with the light-emitting control signal input end of the pixel circuit, and the sensing module is used for sensing the voltage of the light-emitting module in a light-emitting stage and compensating the voltage of the light-emitting module;
the control end of the light-emitting control module is electrically connected with the light-emitting control signal input end of the pixel circuit, and the light-emitting control module is used for controlling the driving signal to be output to the light-emitting module and controlling the light-emitting module to emit light.
2. The pixel circuit according to claim 1, wherein the data voltage writing module comprises a first transistor, the driving module comprises a driving transistor, the light emitting module comprises a light emitting diode, the light emitting control module comprises a second transistor, the storage module comprises a first capacitor, and the sensing module comprises a third transistor; the pixel circuit further comprises a sensing end;
a gate of the first transistor is electrically connected to a first scan signal input terminal of the pixel circuit, a first pole of the first transistor is electrically connected to a data signal input terminal of the pixel circuit, and a second pole of the first transistor is electrically connected to a gate of the driving transistor and a first pole of the first capacitor;
a first electrode of the driving transistor is electrically connected with a second electrode of the first capacitor and a first power supply signal input end of the pixel circuit; a second pole of the driving transistor is electrically connected to a first pole of the second transistor and a first pole of the third transistor;
a second pole of the second transistor is electrically connected with the first pole of the light-emitting diode; the grid electrode of the second transistor is electrically connected with the light-emitting control signal input end of the pixel circuit;
the grid electrode of the third transistor is electrically connected with the light-emitting control signal input end; the second pole of the third transistor is electrically connected with the induction end;
and the second pole of the light-emitting diode is electrically connected with the second power supply signal input end of the pixel circuit.
3. The pixel circuit according to claim 2, further comprising a second capacitor; a first pole of the second capacitor is electrically connected to a second pole of the driving transistor, and a second pole of the second capacitor is electrically connected to a first pole of the third transistor.
4. The pixel circuit according to claim 1, wherein the data voltage writing module comprises a first transistor, the driving module comprises a driving transistor, the light emitting module comprises a light emitting diode, the light emitting control module comprises a second transistor and a fourth transistor, the storage module comprises a first capacitor, and the sensing module comprises a third transistor; the pixel circuit further comprises a fifth transistor and a sensing end;
a gate of the first transistor and a gate of the fifth transistor are electrically connected to a first scan signal input terminal of the pixel circuit, a first pole of the first transistor is electrically connected to a data signal input terminal of the pixel circuit, and a second pole of the first transistor and a first pole of the driving transistor are electrically connected to a first pole of the fourth transistor; a second pole of the fourth transistor and a second pole of the first capacitor are electrically connected with a first power signal input end;
a second pole of the driving transistor is electrically connected to a first pole of the second transistor, a first pole of the third transistor, and a first pole of the fifth transistor; the grid electrode of the driving transistor is electrically connected with the first pole of the first capacitor and the second pole of the fifth transistor; a second pole of the second transistor is electrically connected to a first pole of the light emitting diode, and a gate of the second transistor, a gate of the third transistor, and a gate of the fourth transistor are electrically connected to a light emission control signal input terminal of the pixel circuit; the second pole of the third transistor is electrically connected with the induction end; and the second pole of the light-emitting diode is electrically connected with the second power supply signal input end of the pixel circuit.
5. The pixel circuit according to claim 4, further comprising a sixth transistor and a seventh transistor;
a gate of the sixth transistor and a gate of the seventh transistor are both electrically connected to the second scan signal input terminal of the pixel circuit, and a first pole of the sixth transistor and a first pole of the seventh transistor are both electrically connected to the reference signal input terminal of the pixel circuit; a second pole of the sixth transistor is electrically connected to the first pole of the light emitting diode, and a second pole of the seventh transistor is electrically connected to the gate of the driving transistor.
6. A display panel comprising a signal acquisition and processing unit and a plurality of pixel circuits according to any one of claims 1 to 5;
the signal acquisition and processing unit is electrically connected with the plurality of sensing modules of the pixel circuit through sensing lines and is used for acquiring the voltage of the light emitting modules of the pixel circuit through the sensing lines and the sensing modules and providing voltage compensation signals for the light emitting modules of the pixel circuit through the sensing lines and the sensing modules.
7. The display panel according to claim 6, further comprising a first power supply signal line and a data signal line;
the data signal line is electrically connected with the data voltage writing module, and the first power signal line is electrically connected with the driving module and the storage module; the sensing line is different from the data signal line and/or the first power signal line in a layer, and at least partially overlaps.
8. The display panel according to claim 7, wherein a material of the sensing line is MO/Al/MO, TI/Al/TI, or Cu.
9. A driving method of a display panel for driving the display panel according to any one of claims 6 to 8; it is characterized by comprising:
in the data writing stage, the data voltage writing module in the pixel circuits sequentially writes data voltages into the driving module, and the storage module stores the data voltages;
in the light emitting stage, the light emitting control module in the pixel circuits controls the driving signal output by the driving module to be output to the light emitting module, the light emitting control signal provided by the light emitting control input end of the pixel circuit controls the sensing module to sense the voltage of the light emitting module, the signal collecting and processing unit of the display panel collects the voltage of the light emitting module of the pixel circuits through the sensing module and provides a voltage compensation signal for the light emitting module of the pixel circuit through the sensing module, and the light emitting module emits light.
10. The method for driving a display panel according to claim 9, wherein the pixel circuit further includes a threshold compensation module, and further includes, at the time of the data writing phase:
the threshold compensation module performs threshold compensation on the data voltage written into the driving module.
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