CN115171611A - Pixel circuit, driving method thereof, display panel and display device - Google Patents
Pixel circuit, driving method thereof, display panel and display device Download PDFInfo
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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Abstract
The embodiment of the invention discloses a pixel circuit, a driving method thereof, a display panel and a display device. The pixel circuit comprises a driving module, a first initialization module, a data writing module and a threshold compensation module, wherein the control end of the driving module is electrically connected with a first node, the first end of the driving module is electrically connected with a first power supply voltage end, and the second end of the driving module is electrically connected with a first electrode of the light-emitting element; the control end of the first initialization module is electrically connected with the first scanning signal end; the control end of the data writing module is electrically connected with the second scanning signal end; the threshold compensation module comprises a first transistor and a second transistor, wherein the control end of the first transistor is electrically connected with the second scanning signal end, and the control end of the second transistor is electrically connected with the third scanning signal end. The embodiment of the invention can avoid the influence of transistor characteristic deviation caused by illumination on the pixel circuit, avoid uneven display of the display panel and improve the display effect.
Description
Technical Field
Embodiments of the present invention relate to display technologies, and in particular, to a pixel circuit, a driving method thereof, a display panel, and a display device.
Background
Organic Light Emitting Diode (OLED) is one of the hot spots in the research field of flat panel displays, and compared with Liquid Crystal displays, OLED has the advantages of low energy consumption, low production cost, self-luminescence, wide viewing angle, fast response speed, etc. at present, in the flat panel Display field of mobile phones, PDAs, digital cameras, etc., OLED has begun to replace the traditional Liquid Crystal Display (LCD).
The current OLED display product can set up fingerprint identification function under the screen, and in order to realize fingerprint identification function under the screen, the fingerprint identification district can set up a plurality of formation of image apertures, because the formation of image aperture has the light transmissivity, can lead to the transistor characteristic skew in the pixel circuit after using a period, influences the display effect.
Disclosure of Invention
Embodiments of the present invention provide a pixel circuit, a driving method thereof, a display panel, and a display device, where the pixel circuit can avoid an influence of transistor characteristic shift caused by illumination on the pixel circuit, avoid display unevenness of the display panel, and improve a display effect.
In a first aspect, an embodiment of the present invention provides a pixel circuit, including:
a control end of the driving module is electrically connected with the first node, a first end of the driving module is electrically connected with a first power voltage end, and a second end of the driving module is electrically connected with a first electrode of the light-emitting element;
a control end of the first initialization module is electrically connected with a first scanning signal end, a first end of the first initialization module is electrically connected with a first reference signal end, and a second end of the first initialization module is electrically connected with the first node;
the control end of the data writing module is electrically connected with the second scanning signal end, the first end of the data writing module is electrically connected with the data signal end, and the second end of the data writing module is electrically connected with the first end of the driving module;
the threshold compensation module comprises a first transistor and a second transistor, the control end of the first transistor is electrically connected with the second scanning signal end, the first end of the first transistor is connected with the second end of the driving module, the second end of the first transistor is connected with the first end of the second transistor, the control end of the second transistor is electrically connected with the third scanning signal end, and the second end of the second transistor is electrically connected with the first node.
In a second aspect, an embodiment of the present invention further provides a driving method for driving a pixel circuit, where the driving method is used to drive the pixel circuit, and includes:
in an initialization stage, a first initialization module is controlled to be connected, a data writing module, a threshold compensation module and a driving module are controlled to be disconnected, and the first initialization module initializes the potential of a first node;
in a data writing stage, the data writing module, the threshold compensation module and the driving module are controlled to be switched on, the first initialization module is controlled to be switched off, and the data writing module writes a data signal into the first node;
and in a light-emitting stage, the driving module is controlled to be switched on, the data writing module, the first initialization module and the threshold compensation module are controlled to be switched off, the driving module provides a driving current for the light-emitting element, and the light-emitting element emits light in response to the driving current.
In a third aspect, an embodiment of the present invention further provides a display panel, including the pixel circuit described above.
In a fourth aspect, an embodiment of the present invention further provides a display device, including the display panel described above.
The pixel circuit provided by the embodiment of the invention comprises a driving module, a first initialization module, a data writing module and a threshold compensation module; the control end of the driving module is electrically connected with the first node, the first end of the driving module is electrically connected with the first power voltage end, and the second end of the driving module is electrically connected with the first electrode of the light-emitting element; the control end of the first initialization module is electrically connected with the first scanning signal end, the first end of the first initialization module is electrically connected with the first reference signal end, and the second end of the first initialization module is electrically connected with the first node; the control end of the data writing module is electrically connected with the second scanning signal end, the first end of the data writing module is electrically connected with the data signal end, and the second end of the data writing module is electrically connected with the first end of the driving module; the threshold compensation module comprises a first transistor and a second transistor, the control end of the first transistor is electrically connected with the second scanning signal end, the first end of the first transistor is connected with the second end of the driving module, the second end of the first transistor is connected with the first end of the second transistor, the control end of the second transistor is electrically connected with the third scanning signal end, and the second end of the second transistor is electrically connected with the first node. The threshold compensation module comprises a first transistor and a second transistor, the first transistor is controlled to be switched on and off by a control signal output by the second scanning signal end, and the second transistor is controlled to be switched on and off by a control signal output by the third scanning signal end, so that the influence of transistor characteristic deviation caused by illumination on a pixel circuit is avoided, uneven display of the display panel is avoided, and the display effect is improved.
Drawings
Fig. 1 is a schematic structural diagram of a pixel circuit in the prior art. (ii) a
FIG. 2 is a schematic diagram of a driving timing sequence of the control signals corresponding to FIG. 1;
fig. 3 is a schematic structural diagram of a pixel circuit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another pixel circuit according to an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of a specific circuit structure of a pixel circuit according to an embodiment of the invention;
fig. 6 is a schematic structural diagram of another pixel circuit according to an embodiment of the present invention;
fig. 7 is a schematic flowchart illustrating a driving method of a pixel circuit according to an embodiment of the invention;
fig. 8 is a schematic diagram illustrating a driving timing sequence of a control signal of a pixel circuit according to an embodiment of the invention;
fig. 9 is a schematic structural diagram of a pixel circuit in an initialization stage according to an embodiment of the present invention;
FIG. 10 is a schematic structural diagram of a pixel circuit in a first sub-phase of a data writing phase according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of a pixel circuit in a second sub-phase of a data writing phase according to an embodiment of the present invention;
fig. 12 is a schematic structural diagram of a pixel circuit in a light-emitting stage according to an embodiment of the invention;
fig. 13 is a schematic structural diagram of a display device according to an embodiment of the present 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.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. It should be noted that the terms "upper", "lower", "left", "right", and the like used in the description of the embodiments of the present invention are used in the angle shown in the drawings, and should not be construed as limiting the embodiments of the present invention. In addition, in this context, it is also to be understood that when an element is referred to as being "on" or "under" another element, it can be directly formed on "or" under "the other element or be indirectly formed on" or "under" the other element through an intermediate element. The terms "first," "second," and the like, are used for descriptive purposes only and are not intended to denote any order, quantity, or importance, but rather are used to distinguish one element from another. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Fig. 1 is a schematic structural diagram of a pixel circuit in the prior art. Referring to fig. 1, the pixel circuit includes seven transistors M1' to M7' and a capacitor Cst ', and M4' and M5' each employ a dual gate transistor in order to reduce a leakage current of the N1 node. In the pixel circuit shown in fig. 1, the gates of M1 'and M6' are connected to the enable signal terminal Emit, the gates of M5 'and M7' are connected to the scan signal terminal S1, and the gates of M2 'and M4' are connected to the scan signal terminal S2. Fig. 2 is a schematic diagram of a driving timing sequence of the control signals corresponding to fig. 1, and an operation process of the pixel circuit includes an initialization period T1, a data writing and threshold value compensation period T2, and a light emitting period T3. For a display panel with a fingerprint function under a screen, a plurality of imaging small holes are formed in a fingerprint identification area to enable imaging light to penetrate through, due to the fact that characteristic drift of a transistor is caused by illumination, when a scanning signal end S2 controls a transistor M4 'to be closed, an N4 node can be coupled, source-drain voltage of the M4' -2 is increased, leakage current is increased, the voltage of an N1 node is reduced, the phenomenon that the fingerprint identification area is dark in high gray scale display occurs, and the display effect is affected.
To solve the above problem, fig. 3 is a schematic structural diagram of a pixel circuit according to an embodiment of the present invention. Referring to fig. 3, the pixel circuit includes: a driving module 10, a control terminal of the driving module 10 is electrically connected to the first node N1, a first terminal N2 of the driving module 10 is electrically connected to the first power voltage terminal PVDD, and a second terminal N3 of the driving module 10 is electrically connected to a first electrode of a light emitting element (for example, an LED); a first initialization module 20, a control terminal of the first initialization module 20 being electrically connected to the first scanning signal terminal S1, a first terminal of the first initialization module 20 being electrically connected to the first reference signal terminal Vref1, a second terminal of the first initialization module 20 being electrically connected to the first node N1; the control end of the Data writing module 30 is electrically connected with the second scanning signal end S2, the first end of the Data writing module 30 is electrically connected with the Data signal end Data, and the second end of the Data writing module 30 is electrically connected with the first end of the driving module 10; the threshold compensation module 40 includes a first transistor 41 (M4-1) and a second transistor 42 (M4-2), a control terminal of the first transistor 41 is electrically connected to the second scan signal terminal S2, a first terminal of the first transistor 41 is connected to the second terminal of the driving module 10, a second terminal of the first transistor 41 is connected to the first terminal of the second transistor 42, a control terminal of the second transistor 42 is electrically connected to the third scan signal terminal S3, and a second terminal of the second transistor 42 is electrically connected to the first node N1.
The driving module 10 is configured to drive the light emitting element LED to emit light according to a data signal, and the driving module 10 may include a driving transistor formed by an N-type transistor or a P-type transistor. In a specific implementation, the first end of the driving module 10 and the first power voltage terminal PVDD may be electrically connected directly, may be electrically connected indirectly by disposing other elements in between, and may also be connected in a coupling manner. The first initialization module 20 is used inUnder the control of the first scanning signal terminal S1, the voltage of the first reference signal terminal Vref1 is written into the first node N1, so that initialization of the first node N1 is realized. The data writing module 30 is configured to write a data signal to the first node N1 under the control of the corresponding second scanning signal terminal S2, where the data signal is used to control the magnitude of the driving current output by the driving module 10, so as to control the brightness of the light emitting element. The data writing block 30 may include a P-type transistor or an N-type transistor. The threshold compensation module 40 is used to implement threshold compensation of the gate of the driving transistor in the driving module 10, and in specific implementation, when the Data writing module 30 writes the Data signal into the first node N1, the control signal output by the second scanning signal terminal S2 controls the first transistor 41 to be turned on, the control signal output by the third scanning signal terminal S3 controls the second transistor 42 to be turned on, and the Data voltage V provided by the Data signal terminal Data is used to control the second transistor 42 to be turned on Data Writing the first node N1 through the driving module 10 and the threshold compensation module 40, wherein the second node voltage N2 is V Data The voltage of the first node N1 is V Data -V th In which V is th For driving the threshold voltage of the transistor in the module 10, V is pre-stored at the first node N1 th The associated voltage, the sum of the current formula of the light-emitting element and V th The relevant quantity can be eliminated, so that the current flowing through the light emitting element is V th Independently, threshold compensation is achieved. After the threshold compensation is implemented, the first transistor 41 may be controlled to turn off, and then the second transistor 42 may be controlled to turn off, so as to reduce the coupling effect of the N4 node and avoid uneven display.
According to the pixel circuit provided by the embodiment of the invention, the threshold compensation module comprises the first transistor and the second transistor, the first transistor is controlled to be switched on and switched off by the control signal output by the second scanning signal end, and the second transistor is controlled to be switched on and switched off by the control signal output by the third scanning signal end, so that the influence of transistor characteristic deviation caused by illumination on the pixel circuit is avoided, uneven display of the display panel is avoided, and the display effect is improved.
Fig. 4 is a schematic structural diagram of another pixel circuit according to an embodiment of the present invention. Referring to fig. 4, optionally, the pixel circuit further includes: a memory module 50, a first terminal of the memory module 50 being electrically connected to the first power voltage terminal PVDD, a second terminal of the memory module 50 being electrically connected to the first node N1; a second initializing module 60, a control terminal of the second initializing module 60 being electrically connected to the first scanning signal terminal S1, a first terminal of the second initializing module 60 being electrically connected to the second reference signal terminal Vref2, and a second terminal of the second initializing module 60 being electrically connected to the first electrode of the light emitting element LED; a first light emitting control module 70, a control end of the first light emitting control module 70 is electrically connected to the enable signal end Emit, a first end of the first light emitting control module 70 is electrically connected to the first power voltage end PVDD, and a second end of the first light emitting control module 70 is electrically connected to the first end of the driving module 10; and/or the second light emission control module 80, a control end of the second light emission control module 80 is electrically connected to the enable signal end Emit, a first end of the second light emission control module 80 is electrically connected to a second end of the driving module 10, a second end of the second light emission control module 80 is electrically connected to a first electrode of the light emitting element LED, and a second electrode of the light emitting element LED is electrically connected to the second power supply voltage end PVEE.
The memory module 50 is used for maintaining the potential of the first node N1 when the light emitting element LED emits light. The second initialization module 60 is configured to reset the first electrode (for example, an anode) of the light emitting element LED before the light emitting element LED emits light, so as to avoid the influence of the light emitting brightness in the last light emitting. The first light emitting control module 70 and/or the second light emitting control module 80 are configured to be turned on in a light emitting phase, so that the driving current flows through the light emitting elements LED to emit light. In this embodiment, the first electrode of the light emitting device LED is an anode, the second electrode is a cathode, the first power voltage terminal PVDD provides an anode voltage, and the second power voltage terminal PVEE provides a cathode voltage.
Fig. 5 is a schematic circuit structure diagram of a pixel circuit according to an embodiment of the present invention. Referring to fig. 5, optionally, the driving module 10 includes a driving transistor M3, the data writing module 20 includes a third transistor M2, the first light emission control module 70 includes a fourth transistor M1, the second light emission control module 80 includes a fifth transistor M6, the first initialization module 20 includes a sixth transistor M5, the second initialization module 60 includes a seventh transistor M7, and the storage module 50 includes a first capacitor Cst. A control end of the fourth transistor M1 is electrically connected to the enable signal end Emit, a first end of the fourth transistor M1 is electrically connected to the first power voltage end PVDD, and a second end of the fourth transistor M1 is electrically connected to the first end of the driving transistor M3; a control end of the driving transistor M3 is electrically connected to the first node N1, and a second end of the driving transistor M3 is electrically connected to a first end of the fifth transistor M6; the control end of the third transistor M2 is electrically connected to the second scan signal end S2, the first end of the third transistor M2 is electrically connected to the Data signal end Data, and the second end of the third transistor M2 is electrically connected to the first end of the driving transistor M3; a control end of the fifth transistor M6 is electrically connected to the enable signal end Emit, and a second end of the fifth transistor M6 is electrically connected to the first electrode of the light emitting element LED; a control terminal of the seventh transistor M7 is electrically connected to the first scan signal terminal S1, a first terminal of the seventh transistor M7 is electrically connected to the second reference signal terminal Vref2, and a second terminal of the seventh transistor M7 is electrically connected to the first electrode of the light emitting element LED; a first terminal of the first capacitor Cst is electrically connected to the first node N1, and a second terminal of the first capacitor Cst is electrically connected to the first power voltage terminal PVDD.
In the embodiment shown in fig. 5, the first transistor M4-1 to the seventh transistor M7 and the driving transistor M3 are P-type transistors, in other embodiments, all the transistors may be N-type transistors, and the specific implementation may be designed according to actual situations. In another embodiment, the pixel circuit may include both a P-type transistor and an N-type transistor, and when the pixel circuit includes both transistors, the scanning signal terminal thereof needs to be adjusted according to actual needs.
Fig. 6 is a schematic structural diagram of another pixel circuit according to an embodiment of the present invention. Referring to fig. 6, optionally, the first reference signal terminal Vref1 is multiplexed into the second reference signal terminal Vref2. The multiplexing of the first reference signal terminal Vref1 and the second reference signal terminal Vref2 is set, so that the wiring quantity can be reduced, and the pixel circuit structure is simplified.
With continued reference to fig. 5 or fig. 6, optionally, the sixth transistor M5 is a double-gate transistor. By arranging the sixth transistor M5 as a double-gate transistor, the switching performance of the transistor can be improved, the leakage current of the N1 node can be reduced, and the performance of the pixel circuit can be improved.
Fig. 7 is a schematic flowchart of a driving method of a pixel circuit according to an embodiment of the present invention, where the driving method is used to drive any one of the pixel circuits provided in the foregoing embodiments, and referring to fig. 7, the driving method includes:
step S110, in the initialization stage, the first initialization module is controlled to be turned on, the data writing module, the threshold compensation module and the driving module are controlled to be turned off, and the first initialization module initializes the potential of the first node.
The initialization stage is a first stage of pixel circuit control, and is used to initialize the potential of the first node, and the reference voltage provided by the first reference signal terminal Vref1 is written into the first node through the first initialization module, for example, when the driving transistor in the driving module is a P-type transistor, the reference voltage is a low level signal, and the voltage of the specific low level signal can be selected according to the actual situation.
Step S120, in the data writing stage, the data writing module, the threshold compensation module and the driving module are controlled to be turned on, the first initialization module is controlled to be turned off, and the data writing module writes the data signal into the first node.
The data writing stage is a second stage of pixel circuit control and is used for writing data signals into the first node, the voltage values of the data signals are different, and the conduction degrees of the driving modules in the driving modules are different in the subsequent light-emitting stage so as to control the magnitude of the driving current and control the light-emitting elements to realize display with different brightness.
Step S130, in the light emitting stage, the driving module is controlled to be turned on, the data writing module, the first initialization module and the threshold compensation module are controlled to be turned off, the driving module provides a driving current to the light emitting element, and the light emitting element emits light in response to the driving current.
The light-emitting stage is the third stage of pixel circuit control, and different data voltages are input according to the previous stage, so that the display of different brightness of the light-emitting element can be realized. For the whole display panel, all the pixel circuits are scanned line by line, and picture display is realized.
Optionally, the data writing phase includes a first sub-phase and a second sub-phase; in the first sub-stage, the output signal of the second scanning signal end controls the data writing module and the first transistor to be conducted, the output signal of the third scanning signal end controls the second transistor to be conducted, and the data writing module writes the data signal into the first node; in the second sub-stage, the output signal of the second scanning signal end controls the data writing module and the first transistor to be turned off, and the output signal of the third scanning signal end controls the second transistor to be turned on.
Optionally, the pixel circuit includes a driving module, a first initialization module, a data writing module, a threshold compensation module, a second initialization module, a first light emission control module, a second light emission control module, and a storage module, where the threshold compensation module includes a first transistor and a second transistor, the driving module includes a driving transistor, the data writing module includes a third transistor, the first light emission control module includes a fourth transistor, the second light emission control module includes a fifth transistor, the first initialization module includes a sixth transistor, the second initialization module includes a seventh transistor, and the storage module includes a first capacitor. Fig. 8 is a schematic diagram of a driving timing sequence of a control signal of a pixel circuit according to an embodiment of the present invention, fig. 9 is a schematic diagram of a structure of a pixel circuit in an initialization stage according to an embodiment of the present invention, fig. 10 is a schematic diagram of a structure of a pixel circuit in a first sub-stage of a data writing stage according to an embodiment of the present invention, fig. 11 is a schematic diagram of a structure of a pixel circuit in a second sub-stage of a data writing stage according to an embodiment of the present invention, and fig. 12 is a schematic diagram of a structure of a pixel circuit in a light emitting stage according to an embodiment of the present invention.
Referring to fig. 8 and 9, in the initialization phase T1, the control signal output by the first scan signal terminal S1 controls the sixth transistor M5 and the seventh transistor M7 to be turned on, that is, the first initialization module and the second initialization module are turned on, the voltage signal of the first reference signal terminal Vref1 is transmitted to the first node N1 through the sixth transistor M5 to initialize the first node N1, the voltage signal of the second reference signal terminal Vref2 is transmitted to the first electrode of the light emitting element LED through the seventh transistor M7 to initialize the first electrode, and the control signal output by the enable signal terminal Emit controls the fourth transistor M1 and the fifth transistor M6 to be turned off, so that the first light emitting control module and the second light emitting control module are turned off.
It is understood that the transistors are schematically illustrated as P-type transistors in this embodiment, and for the P-type transistors, the gate voltage is turned on at a low level and turned off at a high level. In the initialization stage T1, the first scan signal terminal S1 outputs a low level, the low level controls the sixth transistor M5 and the seventh transistor M7 to be turned on, the enable signal terminal Emit outputs a high level, the high level controls the fourth transistor M1 and the fifth transistor M6 to be turned off, and a reference voltage (low level) provided by the first reference signal terminal Vref1 is input to the first node N1 through the sixth transistor M5, thereby implementing initialization of the first node N1. At this stage, the second scan signal terminal S2 and the third scan signal terminal S3 both output a high level, and the third transistor M2, the first transistor M4-1, and the second transistor M4-2 are all turned off.
Referring to fig. 8 and 10, in the first sub-phase T21 of the data writing phase T2, the control signal output by the second scan signal terminal S2 controls the third transistor M2 and the first transistor M4-1 to be turned on, and the control signal output by the first scan signal terminal S1 controls the sixth transistor M5 to be turned off, so that the first initialization module is turned off.
In the first sub-stage T21, the first scan signal terminal S1 outputs a high level, the second scan signal terminal S2 and the third scan signal terminal S3 output a low level, the enable signal terminal Emit outputs a high level, the third transistor M2 and the first transistor M4-1 are turned on under the control of the low level provided by the second scan signal terminal S2, the second transistor M4-2 is turned on under the control of the low level provided by the third scan signal terminal S3, because the low level is written in the first node N1 during the initialization stage T1, the driving transistor M3 is also in a turned-on state at this time, and the Data voltage provided by the Data signal terminal Data is written in the first node N1 after passing through the third transistor M2, the driving transistor M3, the first transistor M4-1 and the second transistor M4-2, thereby realizing the threshold compensation of the gate of the driving transistor M3. At this stage, the fourth transistor M1 and the fifth transistor M6 are turned off under the control of the high level provided by the enable signal terminal Emit, and the fifth transistor M5 and the seventh transistor M7 are turned off under the control of the high level provided by the first scan signal terminal S1, so that both the first initialization block and the second initialization block are in the off state.
Referring to fig. 8 and 11, in the second sub-phase T22 of the data writing phase T2, the output signal of the second scan signal terminal S2 controls the third transistor M2 and the first transistor M4-1 to be turned off, and the output signal of the third scan signal terminal S3 controls the second transistor M4-1 to be turned on.
In the second sub-stage T22, the first scan signal terminal S1 and the second scan signal terminal S2 output a high level, the third scan signal terminal S3 outputs a low level, and the enable signal terminal Emit outputs a high level, in this stage, the third transistor M2 and the first transistor M4-1 are switched from on to off, while the second transistor M4-2 is continuously in an on state, N1 and N4 are at almost the same potential, so that coupling of the N4 node is avoided, and in this stage, the states of the other transistors are the same as the state of the first sub-stage T21.
Referring to fig. 8 and 12, in the light emitting period T3, the control signal output by the enable signal end Emit controls the fourth transistor M1 and the fifth transistor M6 to be turned on, the first node N1 controls the driving transistor M3 to be turned on, the driving transistor M3 supplies a driving current to the light emitting element LED, and the light emitting element emits light according to the driving current.
In the light emitting period T3, the first scan signal terminal S1, the second scan signal terminal S2, and the third scan signal terminal S3 output a high level, the enable signal terminal Emit outputs a low level, the fourth transistor M1 and the fifth transistor M6 are turned on under the control of the low level provided by the enable signal terminal Emit, and the current provided by the first power voltage terminal PVDD sequentially passes through the fourth transistor M1, the driving transistor M3, and the fifth transistor M6 and then flows into the light emitting element LED, thereby realizing the display of the light emitting element. At this stage, the first transistor M4-1, the second transistor M4-2, the third transistor M2, the sixth transistor M5, and the seventh transistor M7 are all turned off under the control of a high level provided at the corresponding scan signal terminal.
In summary, according to the technical scheme of the embodiment of the present invention, the threshold compensation module includes the first transistor and the second transistor, the first transistor is controlled to be turned on and off by the control signal output by the second scan signal terminal, and the second transistor is controlled to be turned on and off by the control signal output by the third scan signal terminal, so that the influence of transistor characteristic shift caused by illumination on the pixel circuit is avoided, display unevenness of the display panel is avoided, and the display effect is improved.
The embodiment of the invention also provides a display panel which comprises any one of the pixel circuits provided by the embodiment. The pixel circuit may be disposed in an under-screen fingerprint identification area of the display panel.
Fig. 13 is a schematic structural diagram of a display device according to an embodiment of the present invention. Referring to fig. 13, the display device 1 includes any one of the display panels 2 provided in the embodiments of the present invention. The display device 1 may be a mobile phone, a computer, an intelligent wearable device, and the like.
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 modifications, rearrangements, combinations 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 (14)
1. A pixel circuit, comprising:
a control end of the driving module is electrically connected with the first node, a first end of the driving module is electrically connected with a first power voltage end, and a second end of the driving module is electrically connected with a first electrode of the light-emitting element;
a control end of the first initialization module is electrically connected with a first scanning signal end, a first end of the first initialization module is electrically connected with a first reference signal end, and a second end of the first initialization module is electrically connected with the first node;
the control end of the data writing module is electrically connected with the second scanning signal end, the first end of the data writing module is electrically connected with the data signal end, and the second end of the data writing module is electrically connected with the first end of the driving module;
the threshold compensation module comprises a first transistor and a second transistor, the control end of the first transistor is electrically connected with the second scanning signal end, the first end of the first transistor is connected with the second end of the driving module, the second end of the first transistor is connected with the first end of the second transistor, the control end of the second transistor is electrically connected with the third scanning signal end, and the second end of the second transistor is electrically connected with the first node.
2. The pixel circuit according to claim 1, further comprising:
a first end of the memory module is electrically connected with the first power voltage end, and a second end of the memory module is electrically connected with the first node;
a second initialization module, a control end of which is electrically connected to the first scanning signal end, a first end of which is electrically connected to a second reference signal end, and a second end of which is electrically connected to the first electrode of the light emitting element;
a control end of the first light emitting control module is electrically connected with an enable signal end, a first end of the first light emitting control module is electrically connected with the first power voltage end, and a second end of the first light emitting control module is electrically connected with a first end of the driving module; and/or the presence of a gas in the gas,
and a control end of the second light-emitting control module is electrically connected with the enable signal end, a first end of the second light-emitting control module is electrically connected with a second end of the driving module, a second end of the second light-emitting control module is electrically connected with a first electrode of the light-emitting element, and a second electrode of the light-emitting element is electrically connected with a second power supply voltage end.
3. The pixel circuit according to claim 2, wherein the driving module includes a driving transistor, the data writing module includes a third transistor, the first light emission control module includes a fourth transistor, the second light emission control module includes a fifth transistor, the first initialization module includes a sixth transistor, the second initialization module includes a seventh transistor, and the storage module includes a first capacitor;
a control end of the fourth transistor is electrically connected with the enable signal end, a first end of the fourth transistor is electrically connected with the first power voltage end, and a second end of the fourth transistor is electrically connected with the first end of the driving transistor;
the control end of the driving transistor is electrically connected with the first node, and the second end of the driving transistor is electrically connected with the first end of the fifth transistor;
a control end of the third transistor is electrically connected with the second scan signal end, a first end of the third transistor is electrically connected with the data signal end, and a second end of the third transistor is electrically connected with the first end of the driving transistor;
the control end of the fifth transistor is electrically connected with the enable signal end, and the second end of the fifth transistor is electrically connected with the first electrode of the light-emitting element;
a control end of the seventh transistor is electrically connected to the first scan signal end, a first end of the seventh transistor is electrically connected to the second reference signal end, and a second end of the seventh transistor is electrically connected to the first electrode of the light emitting element;
the first end of the first capacitor is electrically connected with the first node, and the second end of the first capacitor is electrically connected with the first power voltage end.
4. The pixel circuit according to claim 3, wherein the sixth transistor is a double-gate transistor.
5. The pixel circuit according to claim 3, wherein the first to seventh transistors and the driving transistor are all P-type transistors or all N-type transistors.
6. The pixel circuit according to claim 2, wherein the first reference signal terminal is multiplexed into the second reference signal terminal.
7. A driving method for driving the pixel circuit according to any one of claims 1 to 6, the driving method comprising:
in an initialization stage, a first initialization module is controlled to be conducted, a data writing module, a threshold compensation module and a driving module are controlled to be turned off, and the first initialization module initializes the potential of a first node;
in a data writing stage, the data writing module, the threshold compensation module and the driving module are controlled to be switched on, the first initialization module is controlled to be switched off, and the data writing module writes a data signal into the first node;
and in a light emitting stage, the driving module is controlled to be switched on, the data writing module, the first initialization module and the threshold compensation module are controlled to be switched off, the driving module provides a driving current for the light emitting element, and the light emitting element emits light in response to the driving current.
8. The driving method according to claim 7, wherein the data writing phase includes a first sub-phase and a second sub-phase;
in the first sub-stage, an output signal of a second scanning signal end controls the data writing module and the first transistor to be conducted, an output signal of a third scanning signal end controls the second transistor to be conducted, and the data writing module writes a data signal into the first node;
in the second sub-stage, the output signal of the second scanning signal end controls the data writing module and the first transistor to be turned off, and the output signal of the third scanning signal end controls the second transistor to be turned on.
9. The driving method according to claim 8, wherein the driving module includes a driving transistor, the driving method further comprising:
and in the first sub-stage, controlling the data writing module, the driving module and the threshold compensation module to be switched on, controlling the first initialization module to be switched off, and writing a data signal into the first node by the data writing module and performing threshold compensation on the driving transistor.
10. The driving method according to claim 7, wherein the pixel circuit further includes a second initialization module, a first light emission control module, and a second light emission control module, the driving method further comprising:
in the initialization stage, controlling the second initialization module to be conducted, wherein the second initialization module initializes the potential of the first electrode of the light-emitting element;
and in the light-emitting stage, controlling the first light-emitting control module and the second light-emitting control module to be conducted.
11. The driving method according to claim 10, wherein a control terminal of the second initialization module is electrically connected to a first scan signal terminal, and control terminals of the first light emission control module and the second light emission control module are both connected to an enable signal terminal;
the output signal of the first scanning signal end controls the second initialization module to be switched on in the initialization stage and switched off in the data writing stage and the light-emitting stage;
the output signal of the enable signal end controls the first light-emitting control module and the second light-emitting control module to be switched on in the light-emitting stage and switched off in the initialization stage and the data writing stage.
12. The driving method according to claim 7, wherein the output signal of the first scan signal terminal controls the first initialization module to be turned on in the initialization phase and to be turned off in the data writing phase and the light emitting phase.
13. A display panel comprising the pixel circuit according to any one of claims 1 to 6.
14. A display device characterized by comprising the display panel according to claim 13.
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| CN202210908138.6A CN115171611A (en) | 2022-07-29 | 2022-07-29 | Pixel circuit, driving method thereof, display panel and display device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210908138.6A CN115171611A (en) | 2022-07-29 | 2022-07-29 | Pixel circuit, driving method thereof, display panel and display device |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108510944A (en) * | 2017-02-24 | 2018-09-07 | 三星显示有限公司 | Pixel and organic light-emitting display device with the pixel |
| CN112397025A (en) * | 2020-11-24 | 2021-02-23 | 合肥维信诺科技有限公司 | Pixel circuit, driving method thereof and display panel |
| CN112447140A (en) * | 2020-11-30 | 2021-03-05 | 武汉天马微电子有限公司 | Organic light emitting display panel and display device |
| US20220051625A1 (en) * | 2021-05-17 | 2022-02-17 | Xiamen Tianma Micro-Electronics Co., Ltd. | Display panel and display device |
| CN216928002U (en) * | 2021-06-30 | 2022-07-08 | 云谷（固安）科技有限公司 | Pixel circuit and display panel |
-
2022
- 2022-07-29 CN CN202210908138.6A patent/CN115171611A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108510944A (en) * | 2017-02-24 | 2018-09-07 | 三星显示有限公司 | Pixel and organic light-emitting display device with the pixel |
| CN112397025A (en) * | 2020-11-24 | 2021-02-23 | 合肥维信诺科技有限公司 | Pixel circuit, driving method thereof and display panel |
| CN112447140A (en) * | 2020-11-30 | 2021-03-05 | 武汉天马微电子有限公司 | Organic light emitting display panel and display device |
| US20220051625A1 (en) * | 2021-05-17 | 2022-02-17 | Xiamen Tianma Micro-Electronics Co., Ltd. | Display panel and display device |
| CN216928002U (en) * | 2021-06-30 | 2022-07-08 | 云谷（固安）科技有限公司 | Pixel circuit and display panel |
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