CN112289269A - Pixel circuit, control method thereof and display panel - Google Patents
Pixel circuit, control method thereof and display panel Download PDFInfo
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- CN112289269A CN112289269A CN202011194201.1A CN202011194201A CN112289269A CN 112289269 A CN112289269 A CN 112289269A CN 202011194201 A CN202011194201 A CN 202011194201A CN 112289269 A CN112289269 A CN 112289269A
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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
- G09G3/3233—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 current through the light-emitting element
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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]
- G09G3/3266—Details of drivers for scan electrodes
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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]
- G09G3/3275—Details of drivers for data electrodes
- G09G3/3283—Details of drivers for data electrodes in which the data driver supplies a variable data current for setting the current through, or the voltage across, the light-emitting elements
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- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
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Abstract
The embodiment of the invention discloses a pixel circuit, a control method thereof and a display panel. The pixel circuit comprises a light-emitting element, a driving module, a data writing module, a storage module, a compensation module, a first light-emitting control module, a second light-emitting control module and a first initialization module; the compensation module is connected between the control end and the second end of the driving module; the first initialization module is connected between the first initialization signal line and the second end of the driving module; before the data writing stage, the first light-emitting control module, the compensation module and the first initialization module are switched on, and the second light-emitting control module is switched off. According to the technical scheme of the embodiment of the invention, before the data writing stage, the pixel circuit enables the current from the first power supply to flow through the driving module so as to reduce the hysteresis effect of the driving module and ensure that the light-emitting element is not lightened, thereby improving the smear of the display panel and ensuring the contrast of the display panel.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a pixel circuit, a control method thereof and a display panel.
Background
An Active-matrix light-emitting diode (AMOLED) display panel is generally driven by a pixel circuit.
The pixel circuit comprises a driving thin film transistor for providing driving current for the organic light emitting diode, and the display effect of the display panel is influenced by a smear phenomenon of the display panel in the prior pixel driving circuit due to the hysteresis effect of the driving thin film transistor.
Disclosure of Invention
Embodiments of the present invention provide a pixel circuit, a control method thereof and a display panel, so as to improve a smear phenomenon of the display panel caused by a hysteresis effect of a driving thin film transistor, thereby ensuring a good display effect of the display panel.
In a first aspect, an embodiment of the present invention provides a pixel circuit, where the pixel circuit includes: the device comprises a light-emitting element, a driving module, a data writing module, a storage module, a compensation module, a first light-emitting control module, a second light-emitting control module and a first initialization module;
the data writing module is connected between a data line and the driving module, the storage module is connected with a control end of the driving module, the data writing module is used for writing data voltage on the data line into the driving module in response to a signal on a scanning line in a data writing stage, the storage module stores the data voltage, and the driving module is used for generating driving current corresponding to the data voltage;
the first light-emitting control module is connected between a first power supply and a first end of the driving module, the second light-emitting control module is connected between a second end of the driving module and a first pole of the light-emitting element, a second pole of the light-emitting element is connected with a second power supply, and the first light-emitting control module and the second light-emitting control module are used for responding to a signal on a light-emitting control line and controlling the connection and disconnection of paths among the driving module, the first power supply and the second power supply;
the compensation module is connected between the control end and the second end of the driving module; the first initialization module is connected between a first initialization signal line and the second end of the driving module;
before the data writing phase, the first light-emitting control module, the compensation module and the first initialization module are turned on, and the second light-emitting control module is turned off.
Optionally, a control end of the first light-emitting control module is connected to a first light-emitting control line, and the first light-emitting control module is turned on or off in response to a signal on the first light-emitting control line; the control end of the second light-emitting control module is connected with the second light-emitting control line, and the second light-emitting control module responds to a signal on the second light-emitting control line to be switched on or switched off.
Optionally, the control end of the compensation module is connected to a second light-emitting control line.
Optionally, the display device further comprises a second initialization module, wherein the second initialization module is connected between a second initialization signal line and the first pole of the light emitting element.
Optionally, a voltage on the first initialization signal line and a voltage on the second initialization signal line are different.
Optionally, the driving module includes a first transistor, the data writing module includes a second transistor, the storage module includes a first capacitor, the compensation module includes a third transistor, the first initialization module includes a fourth transistor, the first light emission control module includes a fifth transistor, and the second light emission control module includes a sixth transistor;
a first pole of the first transistor is used as a first end of the driving module, a second pole of the first transistor is used as a second end of the driving module, and a grid electrode of the first transistor is used as a control end of the driving module;
a first pole of the second transistor is connected with the data line, a second pole of the second transistor is connected with a first end of the driving module, and a grid electrode of the second transistor is connected with a second scanning line;
a first pole of the first capacitor is connected with the control end of the driving module, and a second pole of the first capacitor is connected with the first power supply;
a first pole of the third transistor is connected to the control end of the driving module, a second pole of the third transistor is connected to the second end of the driving module, and a gate of the third transistor is connected to the second light-emitting control line;
a first pole of the fourth transistor is connected to the second end of the driving module, a second pole of the fourth transistor is connected to the first initialization signal line, and a gate of the fourth transistor is connected to the first scanning line;
a first pole of the fifth transistor is connected with the first power supply, a second pole of the fifth transistor is connected with the first end of the driving module, and a grid electrode of the fifth transistor is connected with the first light-emitting control line;
a first pole of the sixth transistor is connected to the second end of the driving module, a second pole of the sixth transistor is connected to the first pole of the light emitting element, and a gate of the sixth transistor is connected to the second light emitting control line.
Optionally, the first transistor, the second transistor, the fourth transistor, the fifth transistor, and the sixth transistor are LTPS transistors; the third transistor is an IGZO transistor.
In a second aspect, an embodiment of the present invention further provides a method for controlling a pixel circuit, where the method for controlling a pixel circuit can be performed by the pixel circuit in any embodiment of the present invention, and the method includes:
before a data writing stage, controlling the first light-emitting control module, the compensation module and the first initialization module to be switched on, and controlling the second light-emitting control module to be switched off;
in a data writing stage, controlling the first light-emitting control module to be switched off and controlling the data writing module to be switched on;
in a light-emitting stage, controlling the first light-emitting control module and the second light-emitting control module to be conducted; and controlling current to flow from the first power supply to the first light-emitting control module, the driving module and the first initialization module in sequence and flow out from the first initialization signal line.
Optionally, before the data writing phase, an initialization phase is further included; and controlling the first initialization module and the first lighting control module to be switched off in the initialization stage.
In a third aspect, an embodiment of the present invention further provides a display panel, where the display panel includes the pixel circuit in any embodiment of the present invention.
According to the technical scheme provided by the embodiment of the invention, before the data writing stage, the first light-emitting control module, the compensation module and the first initialization module are controlled to be switched on, and the second light-emitting control module is controlled to be switched off, so that the current from the first power supply sequentially flows through the first light-emitting control module, the driving module and the first initialization module, and finally flows out of the first initialization signal line without flowing through the light-emitting element. Before the data writing stage, the current from the first power supply flows through the second end of the driving module from the first end of the driving module, the driving module is switched on and flows through the current, so that before one frame of display, the bias states of the driving module are consistent, the influence of the previous frame of display picture on the current required display picture is avoided, the current required display picture is ensured not to be influenced by the bias state of the driving module in the previous frame, the influence of the hysteresis effect of the driving module on the display is relieved, the smear phenomenon of the display panel is improved, the current does not flow through the light-emitting element to enable the light-emitting element to be lightened, flows from the first initialization module to the first initialization signal line and finally flows out from the first initialization signal line, and the contrast of the display panel is ensured. The technical scheme provided by the embodiment of the invention can improve the hysteresis effect of the driving module, ensure that the light-emitting element is not lightened, and improve the display effect.
Drawings
Fig. 1 is a schematic structural diagram of a pixel circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another pixel circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another pixel circuit according to an embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a specific circuit structure of a pixel driving circuit according to an embodiment of the invention;
fig. 5 is a driving timing diagram of the pixel driving circuit shown in fig. 4.
Fig. 6 is a schematic structural diagram of a display panel 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.
As mentioned in the background art, the driving thin film transistor in the pixel circuit supplies a driving current to the organic light emitting diode, and the organic light emitting diode emits light in response to the driving current, so that the display panel performs display, and the gray scale of the display panel is rapidly switched in units of frames. For example, when the N-1 th frame is a black frame, the N-1 th frame is a white frame, and the N +1 th frame is a white frame, it is necessary to drive the tft to output a driving current for displaying the white frame in both the N-th frame and the N +1 th frame, however, the N-1 th frame to the N-th frame are from an off state to an on state, and the N-1 th frame to the N +1 th frame are from an on state to an on state, due to a hysteresis effect of the tft, a current-voltage curve (I-V curve) of the tft is different between the N-th frame and the N +1 th frame, and the tft cannot output a driving current for displaying the white frame at the N-th frame which is the same as the driving current of the N +1 th frame under the same gate source voltage, that is, the N-th frame cannot display a target luminance but displays an intermediate gray, the problem of "smear" is reflected on the display panel.
With reference to fig. 1, fig. 1 is a schematic structural diagram of a pixel circuit according to an embodiment of the present invention, where the pixel circuit includes: the device comprises a light-emitting element D, a driving module 1, a data writing module 2, a storage module 8, a compensation module 3, a first light-emitting control module 5, a second light-emitting control module 6 and a first initialization module 4;
the Data writing module 2 is connected between the Data line Data and the driving module 1, the storage module 8 is connected with the control end a3 of the driving module 1, the Data writing module 2 is used for writing the Data voltage Vdata on the Data line Data into the driving module 1 in response to the signal on the Scan line Scan in the Data writing stage, the storage module 8 stores the Data voltage Vdata, and the driving module 1 is used for generating the driving current Id corresponding to the Data voltage Vdata;
the first light-emitting control module 5 is connected between a first power supply VDD and a first end a1 of the driving module 1, the second light-emitting control module 6 is connected between a second end a2 of the driving module 1 and a first pole of the light-emitting element D, a second pole of the light-emitting element D is connected with a second power supply VSS, and the first light-emitting control module 5 and the second light-emitting control module 6 are used for responding to a signal on a light-emitting control line EM and controlling the connection and disconnection of paths between the driving module 1 and the first power supply VDD and the second power supply VSS;
the compensation module 3 is connected between the control end a3 of the driving module 1 and the second end a2 of the driving module 1; the first initializing module 4 is connected between the first initializing signal line Vref1 and the second end a2 of the driving module 1;
before the data writing phase, the first light emitting control module 5, the compensation module 3 and the first initialization module 4 are turned on, and the second light emitting control module 6 is turned off.
In the data writing stage, the first lighting control module 5 is controlled to be turned off, and the data writing module 2 is controlled to be turned on.
In the light emitting phase, the first light emitting control module 5 is controlled to be turned off, and the second light emitting control module 6 is controlled to be turned on.
Specifically, the light emitting element D may be an organic light emitting diode, the first pole of the light emitting element D may be an anode of the organic light emitting diode, the second pole of the light emitting element D may be a cathode of the organic light emitting diode, and the driving module 1 may be a driving thin film transistor.
The Data writing module 2 is capable of writing the Data voltage Vdata on the Data line Data into the control terminal a3 of the driving module 1 and the storage module 8 in response to the signal on the Scan line Scan in the Data writing phase of the pixel circuit, so that the storage module 8 stores the Data voltage Vdata, and the driving module 1 generates the driving current Id corresponding to the Data voltage Vdata.
The first and second light emission control modules 5 and 6 are capable of responding to a signal on the light emission control line EM to connect the line between the first end a1 of the driving module 1 and the first power supply VDD and the line between the second end a2 of the driving module 1 and the second power supply VSS during the light emission phase of the light emitting element D, and the light emitting element D emits light in response to the driving current Id; in addition, the first light emission control module 5 and the second light emission control module 6 can also respond to the signal on the light emission control line EM to disconnect the first end a1 of the driving module 1 from the first power source VDD or disconnect the second end a2 of the driving module 1 from the second power source VSS during the non-light emission phase of the light emitting element D, so as to avoid the light emission problem of the light emitting element D during the non-light emission phase.
The compensation module 3 can capture the threshold voltage Vth of the driving module 1 to the control end a3 of the driving module 1 in the compensation stage of the pixel circuit, which is beneficial to the driving current Id flowing through the light emitting element D in the light emitting stage of the light emitting element D to be unrelated to the threshold voltage Vth of the driving module 1, and effectively avoid the problem of uneven display caused by the drift of the threshold voltage Vth of the driving module 1.
In the pixel circuit provided by this embodiment, the first light emitting control module 5 is connected between the first power supply VDD and the first end a1 of the driving module 1, the second light emitting control module 6 is connected between the second end a2 of the driving module 1 and the first pole of the light emitting device D, the compensation module 3 is connected between the control end a3 and the second end of the driving module 1, and the first initialization module 4 is connected between the first initialization line and the second end a2 of the driving module 1; thus, before the data writing phase of the pixel circuit, the first light emission control module 5, the compensation module 3, and the first initialization module 4 are controlled to be turned on, and the second light emission control module 6 is controlled to be turned off, so that the current from the first power supply VDD can flow through the first light emission control module 5, the driving module 1, and the first initialization module 4 in order before the data writing phase, and finally flows out from the first initialization signal line Vref1 without flowing through the light emitting element D. That is, the pixel circuit provided in this embodiment can make the current from the first power supply VDD flow through the second end a2 of the driving module 1 from the first end a1 of the driving module 1 before the data writing stage of the pixel circuit, the driving module 1 is turned on and flows the current, so that before one frame of display, the 1 bias states of the driving modules are all the same, thereby avoiding the influence of the previous frame of display picture on the currently required display picture, ensuring that the currently required display picture is not influenced by the bias state of the driving module 1 in the previous frame, alleviating the influence of the hysteresis effect of the driving module 1 on the display, improving the smear phenomenon of the display panel, and the current flowing through the driving module 1 does not flow through the light emitting element D but flows through the first initialization module 4 and flows out from the first initialization signal line Vref1, ensuring that the light emitting element D is not lighted when the current flows through the driving module 1, therefore, the pixel circuit provided by this embodiment does not cause the current to flow through the light emitting element D to light the light emitting element D while causing the current to flow through the driving module 1 to reduce the hysteresis effect of the driving module 1, thereby improving the smear of the display panel and ensuring the contrast of the display panel.
For example, if the nth-1 frame of the display panel is a black frame, the nth frame is a white frame, and the N +1 th frame is a white frame, the pixel circuit provided in this embodiment, after the display of the nth-1 frame of the display panel and before the data writing phase of the pixel circuit of the nth frame, allows the current from the first power source VDD to flow from the first end a1 of the driving module 1 to the second end a2 of the driving module 1, so as to reduce the hysteresis effect of the driving module 1, reduce the influence of the display image of the nth-1 frame on the display of the nth frame of the display panel during the light emitting phase, reduce the smear phenomenon of the nth frame, prevent the current flowing through the driving module 1 from flowing through the light emitting element D, but flowing through the first initialization module 4 and flowing out from the first initialization signal line Vref1, prevent the light emitting element D from being turned on, and ensure the contrast of the display panel.
In addition, in the pixel circuit provided in this embodiment, in the initialization stage, the first initialization module 4 and the compensation module 3 are controlled to be turned on, and the initialization signal from the first initialization signal line Vref1 can sequentially pass through the first initialization module 4 and the compensation module 3 to initialize the control end a3 of the driving module 1, so as to initialize the potential of the control end a3 of the driving module 1, thereby preventing the potential stored in the storage module 8 corresponding to the previous frame of display from affecting the display of the next frame of display.
With continued reference to fig. 1, optionally, the control terminal of the first lighting control module 5 is connected to the first lighting control line EM1, and the first lighting control module 5 is turned on or off in response to a signal on the first lighting control line EM 1; the control terminal of the second light emission control module 6 is connected to the second light emission control line EM2, and the second light emission control module 6 is turned on or off in response to a signal on the second light emission control line EM 2.
Specifically, the first light emitting control module 5 and the second light emitting control module 6 respectively respond to different light emitting control lines, so as to respectively control the first light emitting control module 5 and the second light emitting control module 6, and further, before the data writing phase, control the first light emitting control module 5 to be turned on so that the current flowing through the driving module 1 does not flow through the light emitting element D when the first light emitting control module 5 is controlled to be turned on so that the current flowing through the driving module 1 flows through the driving module 1.
Fig. 2 is a schematic structural diagram of another pixel circuit provided in the embodiment of the present invention, and referring to fig. 2, optionally, the control terminal of the compensation module 3 is connected to the second emission control line EM 2.
Specifically, the compensation module 3 may be controlled to be turned on or off at the control end of the compensation module 3, and the control end of the compensation module 3 is connected to the second emission control line EM2, which is beneficial to reducing the wiring in the display panel, thereby simplifying the wiring structure of the display panel.
Fig. 3 is a schematic structural diagram of another pixel circuit provided in the embodiment of the present invention, and referring to fig. 3, optionally, the pixel circuit provided in the embodiment of the present invention further includes a second initialization module 7, where the second initialization module 7 is connected between the second initialization signal line Vref2 and the first pole of the light emitting element D.
Specifically, the second initialization block 7 is configured to write the initialization signal on the second initialization signal line Vref2 into the first pole of the light emitting element D in response to the Scan signal on the Scan line Scan being turned on in the data writing stage of the pixel circuit, so as to perform the potential initialization on the first pole of the light emitting element D.
With continued reference to fig. 3, optionally, the voltage on the first initialization signal line Vref1 and the voltage on the second initialization signal line Vref2 are different.
Specifically, the control terminal a3 of the driving module 1 is potential-initialized by the initialization signal on the first initialization signal line Vref1, and the first pole of the light emitting element D is potential-initialized by the initialization signal on the second initialization signal line Vref 2. The voltage on the first initialization signal line Vref1 and the voltage on the second initialization signal line Vref2 are different, so that the control terminal a3 of the driving module 1 and the first pole of the light emitting element D can be initialized by different initialization voltages. For example, a higher initialization voltage is provided to the control terminal a3 of the driving module 1 to shorten the compensation period of the pixel circuit, and a lower initialization voltage is provided to the first pole of the light emitting device D, which is beneficial to the consistency between the voltage of the first pole and the voltage of the second pole of the light emitting device D, so as to effectively avoid the light emitting device D from emitting light in the non-light emitting period, i.e., to shorten the compensation period of the pixel circuit and simultaneously improve the initialization effect of the light emitting device D. Moreover, different initialization signal lines are respectively connected to the control terminal a3 of the driving module 1 and the first pole of the light emitting element D, and compared with the connection of the same initialization signal line to the control terminal a3 of the driving module 1 and the first pole of the light emitting element D, the load on the initialization signal line is reduced, so that the voltage initialization is more accurately performed on the control terminal a3 of the driving module 1 and the first pole of the light emitting element D, and the initialization effect on the control terminal a3 of the driving module 1 and the first pole of the light emitting element D is further improved.
Fig. 4 is a schematic diagram of a specific circuit structure of a pixel driving circuit according to an embodiment of the present invention, and with reference to fig. 3 and fig. 4, optionally, the driving module 1 includes a first transistor M1, the data writing module 2 includes a second transistor M2, the storage module 8 includes a first capacitor C1, the compensation module 3 includes a third transistor M3, the first initialization module 4 includes a fourth transistor M4, the first light-emitting control module 5 includes a fifth transistor M5, and the second light-emitting control module 6 includes a sixth transistor M6;
a first pole of the first transistor M1 is used as the first end a1 of the driving module 1, a second pole of the first transistor M1 is used as the second end a2 of the driving module 1, and a gate of the first transistor M1 is used as the control end a3 of the driving module 1;
a first pole of the second transistor M2 is connected to the Data line Data, a second pole of the second transistor M2 is connected to the first end a1 of the driving module 1, and a gate of the second transistor M2 is connected to the second Scan line Scan 2;
a first pole of the first capacitor C1 is connected to the control terminal a3 of the driving module 1, and a second pole of the first capacitor C1 is connected to the first power supply VDD;
a first pole of the third transistor M3 is connected to the control end a3 of the driving module 1, a second pole of the third transistor M3 is connected to the second end a2 of the driving module 1, and a gate of the third transistor M3 is connected to the second light-emitting control line EM 2; the gate of the third transistor M3 is used as the control terminal of the compensation module 3;
a first pole of the fourth transistor M4 is connected to the second end a2 of the driving module 1, a second pole of the fourth transistor M4 is connected to the first initialization signal line Vref1, and a gate of the fourth transistor M4 is connected to the first Scan line Scan 1;
a first pole of the fifth transistor M5 is connected to the first power source VDD, a second pole of the fifth transistor M5 is connected to the first terminal a1 of the driving module 1, and a gate of the fifth transistor M1 is connected to the first light emitting control line EM 1;
a first pole of the sixth transistor M6 is connected to the second terminal a2 of the driving module 1, a second pole of the sixth transistor M6 is connected to the first pole of the light emitting device D, and a gate of the sixth transistor M6 is connected to the second light emitting control line EM 2.
With continued reference to fig. 4, optionally, the second initialization module 7 includes a seventh transistor M7, a first pole of the seventh transistor M7 is connected to the first pole of the light emitting element D, a second pole of the seventh transistor M7 is connected to the second initialization signal line Vref2, and a gate of the seventh transistor M7 is connected to the second Scan line Scan 2.
Specifically, in the specific circuit diagram of the pixel circuit shown in fig. 4, the third transistor M3 and the sixth transistor M6 are each responsive to a light emission control signal on the second light emission control line EM2, the fifth transistor M5 is responsive to a light emission control signal on the first light emission control line EM1, the second transistor M2 and the seventh transistor M7 are each controlled by the second Scan line Scan2, the fourth transistor M4 is controlled by the first Scan line Scan1, the second transistor M2 is responsive to a Data signal on the Data line Data, the fourth transistor M4 is responsive to an initialization signal on the first initialization signal line Vref1, and the seventh transistor M7 is responsive to an initialization signal on the second initialization signal line Vref 2. Compared with the 7T1C pixel circuit in the prior art, the pixel circuit provided in the embodiment of the present invention does not need to increase the number of transistors, but changes the connection relationship of the transistors and the corresponding time-driving timing sequence, and before one frame is displayed, the bias states of the first transistor M1 are all the same, so as to avoid the influence of the previous frame display picture on the currently required display picture, ensure that the currently required display picture is not influenced by the bias state of the driving module 1 in the previous frame, alleviate the influence of the hysteresis effect of the first transistor M1 on the display, improve the smear phenomenon of the display panel, and flow the first transistor M4 and flow out from the first initialization signal line Vref1, ensure that the light emitting element D is not lighted when the current flows through the first transistor M11, and ensure the contrast of the display panel.
Optionally, the first transistor M1, the second transistor M2, the fourth transistor M4, the fifth transistor M5 and the sixth transistor M6 are LTPS transistors; the third transistor M3 is an IGZO transistor. Optionally, the seventh transistor M7 is an LTPS transistor.
Specifically, the IGZO transistor has a smaller leakage current, and the third transistor M3 is set to be the IGZO transistor, so that the first transistor M1 is ensured to have a smaller leakage current, which is beneficial to ensuring the stability of the gate voltage of the first transistor M1 while realizing the low refresh frequency of the display panel, and improving the flicker phenomenon at the low refresh frequency.
The embodiment of the present invention further provides a control method for a pixel circuit, where the control method for the pixel circuit is executed by the pixel circuit in the above technical solution, and the method includes:
before the data writing stage, the first light emitting control module 5, the compensation module 3 and the first initialization module 4 are controlled to be turned on, and the second light emitting control module 6 is controlled to be turned off, so that the current is controlled to sequentially flow through the first light emitting control module 5, the driving module 1 and the first initialization module 4 from the first power supply VDD and flow out from the first initialization signal line Vref 1;
in the data writing stage, the first lighting control module 5 is controlled to be turned off, and the data writing module 2 is controlled to be turned on;
and in the light-emitting stage, the first light-emitting control module 5 and the second light-emitting control module 6 are controlled to be conducted.
Taking the driving sequence shown in fig. 5 as an example applied to the pixel driving circuit shown in fig. 4, the following will specifically describe the operation principle of the specific pixel circuit shown in fig. 4 with reference to fig. 3 to 5, wherein, for example, the first transistor M1, the second transistor M2, the fourth transistor M4, the fifth transistor M5, the sixth transistor M6 and the seventh transistor M7 are all P-type thin film transistors, and the third transistor M3 is an N-type thin film transistor:
before the data writing phase (time period t 1), the signal on the first Scan line Scan1 is at a low level, the signal on the second Scan line Scan2 is at a high level, the signal on the first light emission control line EM1 is at a low level, the signal on the second light emission control line EM2 is at a high level, the fifth transistor M5, the third transistor M3 and the fourth transistor M4 are all turned on, the sixth transistor M6 is turned off, and the second transistor M2 and the seventh transistor M7 are all turned off. The initialization signal from the first initialization signal line Vref1 sequentially passes through the fourth transistor M4 and the third transistor M3 to initialize the first electrode of the first capacitor C1, after the first electrode of the first capacitor C1 is initialized to the initialization voltage, the first transistor M1 is turned on, the current from the first power supply VDD sequentially flows through the fifth transistor M5, the first transistor M1 and the fourth transistor M4 and flows out from the first initialization signal line Vref1, the first transistor M1 is turned on and flows through current, so that the bias states of the first transistor M1 are all the same before one frame display, the influence of the display picture of the previous frame on the currently required display picture is avoided, the currently required display picture is guaranteed not to be influenced by the bias state of the first transistor M1 in the previous frame, the influence of the hysteresis effect of the first transistor M1 on the display is relieved, the smear phenomenon of the display panel is improved, and the current flows out from the first initialization signal line Vref 35 due to the turn-off of the sixth transistor M6, the current flows out from the first initialization signal line 1 in the lighting stage, and the smear phenomenon of the The light emitting element D ensures the contrast of the display screen.
In the data writing phase (time period t 3), the signal on the first Scan line Scan1 is at a high level, the signal on the second Scan line Scan2 is at a low level, the signal on the first light emission control line EM1 is at a high level, the signal on the second light emission control line EM2 is at a high level, the fifth transistor M5 is turned off, the second transistor M2 and the seventh transistor M7 are both turned on, the third transistor M3 is turned on, and the fourth transistor M4 and the sixth transistor M6 are both turned off. At this time, the gate of the first transistor M1 is still at the initialization voltage, the first transistor M1 is turned on, the data voltage Vdata is written to the first pole of the first capacitor C1 through the second transistor M2, the first transistor M1 and the third transistor M3 in sequence, and when the voltage of the first pole of the first capacitor C1 is written to Vdata + Vth from the initialization voltage, the first transistor M1 is turned off, and at the same time, the potential of the first pole of the light emitting element D is initialized by the initialization signal from the second initialization signal line Vref 2.
In the light emitting period (t4 period), the signal on the first Scan line Scan1 is at a high level, the signal on the second Scan line Scan2 is at a high level, the signal on the first light emission control line EM1 is at a low level, the signal on the second light emission control line EM2 is at a low level, the fifth transistor M5 and the sixth transistor are both turned on, and the second transistor M2, the third transistor M3, the fourth transistor M4, and the seventh transistor M7 are all turned off. The driving current Id flowing through the first transistor M1 at this time is controlled by the data voltage Vdata, and the threshold voltage Vth is compensated.
Continuing with fig. 3 to 5, optionally, before the data writing phase, an initialization phase is further included; the first initialization module 4 is controlled to be turned on and the first lighting control module 5 is controlled to be turned off in the initialization phase.
Specifically, in a period t1 of the initialization stage, the fourth transistor M4 and the third transistor M3 are turned on, and the initialization signal from the first initialization signal line Vref1 passes through the fourth transistor M4 and the third transistor M3 in order to perform potential initialization on the gate of the first transistor M1; in a period t2 of the initialization stage, the signal on the first Scan line Scan1 is at a low level, the signal on the second Scan line Scan2 is at a high level, the signal on the first emission control line EM1 is at a high level, the signal on the second emission control line EM2 is at a high level, the fifth transistor M5 is turned off, and the initialization signal from the first initialization signal line Vref1 sequentially passes through the fourth transistor M4 and the third transistor M3 to continue the potential initialization of the gate of the first transistor M1.
An embodiment of the present invention further provides a display panel, where the display panel includes the Pixel circuit according to the above technical solution, fig. 6 is a schematic structural diagram of the display panel according to the embodiment of the present invention, and referring to fig. 6, the display panel includes a display area and a non-display area, the display area includes a plurality of sub-Pixel pixels arranged in an array, and each sub-Pixel corresponds to one Pixel circuit according to the above technical solution. The non-display area includes a data driver 100, a scan driver 200, and an emission driver 300; the Data driver 100 is configured to provide a Data voltage Vdata to the pixel circuits through the Data lines Data, the Scan driver 200 is configured to provide Scan signals to the pixel circuits through Scan lines Scan, and the emission driver 300 is configured to provide emission control signals to the pixel circuits through emission control lines EM, where the Scan driver 200 and the emission driver 300 are both in a cascade manner, that is, one Scan line Scan2 serving as a Scan line Scan2 of a pixel circuit in a row is simultaneously used as a Scan line Scan1 of a pixel circuit in a next row, and one emission control line EM2 serving as an emission control line EM2 of a pixel circuit in a row is simultaneously used as an emission control line EM1 of a pixel circuit in a next row. The display panel, the control method of the pixel circuit and the pixel circuit provided by the embodiment of the invention belong to the same invention concept, so the same technical effect can be realized, and repeated contents are not repeated herein.
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, comprising: the device comprises a light-emitting element, a driving module, a data writing module, a storage module, a compensation module, a first light-emitting control module, a second light-emitting control module and a first initialization module;
the data writing module is connected between a data line and the driving module, the storage module is connected with a control end of the driving module, the data writing module is used for writing data voltage on the data line into the driving module in response to a signal on a scanning line in a data writing stage, the storage module stores the data voltage, and the driving module is used for generating driving current corresponding to the data voltage;
the first light-emitting control module is connected between a first power supply and a first end of the driving module, the second light-emitting control module is connected between a second end of the driving module and a first pole of the light-emitting element, a second pole of the light-emitting element is connected with a second power supply, and the first light-emitting control module and the second light-emitting control module are used for responding to a signal on a light-emitting control line and controlling the connection and disconnection of paths among the driving module, the first power supply and the second power supply;
the compensation module is connected between the control end and the second end of the driving module; the first initialization module is connected between a first initialization signal line and the second end of the driving module;
before the data writing phase, the first light-emitting control module, the compensation module and the first initialization module are turned on, and the second light-emitting control module is turned off.
2. The pixel circuit according to claim 1, wherein a control terminal of the first light emitting control module is connected to a first light emitting control line, and the first light emitting control module is turned on or off in response to a signal on the first light emitting control line; the control end of the second light-emitting control module is connected with the second light-emitting control line, and the second light-emitting control module responds to a signal on the second light-emitting control line to be switched on or switched off.
3. The pixel circuit according to claim 2, wherein the control terminal of the compensation module is connected to a second of the emission control lines.
4. The pixel circuit according to claim 1, further comprising a second initialization module connected between a second initialization signal line and the first pole of the light emitting element.
5. The pixel circuit according to claim 4, wherein a voltage on the first initialization signal line and a voltage on the second initialization signal line are different.
6. The pixel circuit according to claim 1, wherein the driving module comprises a first transistor, the data writing module comprises a second transistor, the storage module comprises a first capacitor, the compensation module comprises a third transistor, the first initialization module comprises a fourth transistor, the first light emission control module comprises a fifth transistor, and the second light emission control module comprises a sixth transistor;
a first pole of the first transistor is used as a first end of the driving module, a second pole of the first transistor is used as a second end of the driving module, and a grid electrode of the first transistor is used as a control end of the driving module;
a first pole of the second transistor is connected with the data line, a second pole of the second transistor is connected with a first end of the driving module, and a grid electrode of the second transistor is connected with a second scanning line;
a first pole of the first capacitor is connected with the control end of the driving module, and a second pole of the first capacitor is connected with the first power supply;
a first pole of the third transistor is connected to the control end of the driving module, a second pole of the third transistor is connected to the second end of the driving module, and a gate of the third transistor is connected to the second light-emitting control line;
a first pole of the fourth transistor is connected to the second end of the driving module, a second pole of the fourth transistor is connected to the first initialization signal line, and a gate of the fourth transistor is connected to the first scanning line;
a first pole of the fifth transistor is connected with the first power supply, a second pole of the fifth transistor is connected with the first end of the driving module, and a grid electrode of the fifth transistor is connected with the first light-emitting control line;
a first pole of the sixth transistor is connected to the second end of the driving module, a second pole of the sixth transistor is connected to the first pole of the light emitting element, and a gate of the sixth transistor is connected to the second light emitting control line.
7. The pixel circuit according to claim 6, wherein the first transistor, the second transistor, the fourth transistor, the fifth transistor, and the sixth transistor are all LTPS transistors; the third transistor is an IGZO transistor.
8. A method of controlling a pixel circuit, the method being performed by the pixel circuit of any one of claims 1 to 7, the method comprising:
before a data writing stage, controlling the first light-emitting control module, the compensation module and the first initialization module to be switched on, and controlling the second light-emitting control module to be switched off;
in a data writing stage, controlling the first light-emitting control module to be switched off and controlling the data writing module to be switched on;
in a light-emitting stage, controlling the first light-emitting control module and the second light-emitting control module to be conducted; and controlling current to flow from the first power supply to the first light-emitting control module, the driving module and the first initialization module in sequence and flow out from the first initialization signal line.
9. The method for controlling a pixel circuit according to claim 8, further comprising an initialization phase before the data writing phase; and controlling the first initialization module and the first lighting control module to be switched off in the initialization stage.
10. A display panel comprising the pixel circuit according to any one of claims 1 to 7.
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| CN202011194201.1A CN112289269A (en) | 2020-10-30 | 2020-10-30 | Pixel circuit, control method thereof and display panel |
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| CN202011194201.1A CN112289269A (en) | 2020-10-30 | 2020-10-30 | Pixel circuit, control method thereof and display panel |
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