CN112837653A - Pixel driving circuit and display panel - Google Patents
Pixel driving circuit and display panel Download PDFInfo
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- CN112837653A CN112837653A CN202110298286.6A CN202110298286A CN112837653A CN 112837653 A CN112837653 A CN 112837653A CN 202110298286 A CN202110298286 A CN 202110298286A CN 112837653 A CN112837653 A CN 112837653A
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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]
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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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- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of El Displays (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention discloses a pixel driving circuit and a display panel. The pixel driving circuit includes: a driving module for providing a driving current to a light emitting module, the light emitting module being responsive to the driving current; the threshold compensation module is used for capturing the threshold voltage of the driving module to the control end of the driving module in the threshold compensation stage; the storage module is used for maintaining the electric potential of the control end of the driving module; and the first end of the coupling module is electrically connected with the control end of the threshold compensation module, and the second end of the coupling module is electrically connected with the control end of the driving module. The embodiment of the invention can improve the driving capability of the pixel driving circuit at high frequency.
Description
Technical Field
The embodiment of the invention relates to a display technology, in particular to a pixel driving circuit and a display panel.
Background
With the development of display technology, the application of display panels is becoming more and more extensive, and accordingly, the requirements on display panels are also becoming higher and higher, and the pixel driving circuit is used as an important part of the display panel for driving the light emitting module in the display panel to emit light for display, and accordingly, the requirements on the pixel driving circuit are also becoming higher and higher.
However, the conventional pixel driving circuit has poor driving effect at high frequency, which results in great limitation on the application of the display panel.
Disclosure of Invention
The invention provides a pixel driving circuit and a display panel, which are used for improving the driving capability of the pixel driving circuit at high frequency.
In a first aspect, an embodiment of the present invention provides a pixel driving circuit, where the pixel driving circuit includes: a driving module for providing a driving current to a light emitting module, the light emitting module being responsive to the driving current; the threshold compensation module is used for capturing the threshold voltage of the driving module to the control end of the driving module in the threshold compensation stage; the storage module is used for maintaining the electric potential of the control end of the driving module; and the first end of the coupling module is electrically connected with the control end of the threshold compensation module, and the second end of the coupling module is electrically connected with the control end of the driving module.
Optionally, the coupling module comprises a coupling capacitor.
Optionally, the capacitance value of the coupling capacitance is configured to:
wherein, C1Is the capacitance value of the memory module, C2The Vth is the threshold voltage of the driving module and is the capacitance value of the coupling capacitor; VGH is the electric potential of the control end of the threshold compensation module when the threshold compensation module is turned off, and VGL is the electric potential of the control end of the threshold compensation module when the threshold compensation module is turned on.
Optionally, the first end of the threshold compensation module includes a first metal plate, the first end of the threshold compensation module is electrically connected to the control end of the driving module, and the control end of the threshold compensation module includes a second metal plate; the first metal plate and the second metal plate are at least partially overlapped to form the coupling capacitor.
Optionally, the pixel driving circuit further includes: the first end of the first initialization module is connected with a data signal, the second end of the first initialization module is electrically connected with the control end of the driving module, the control end of the first initialization module is connected with a first scanning signal, and the first initialization module is used for initializing the driving module in an initialization stage.
Optionally, the pixel driving circuit further includes: a second initialization module, a first end of the second initialization module being connected to a reference signal, a control end of the second initialization module being connected to the first scanning signal, a second end of the second initialization module being electrically connected to the light emitting module, the second initialization module being configured to initialize the light emitting module in an initialization stage.
Optionally, the pixel driving circuit further includes: a second initialization module, a first end of the second initialization module and a control end of the second initialization module access the first scanning signal, a second end of the second initialization module is electrically connected with the light emitting module, and the second initialization module is used for initializing the light emitting module in an initialization stage.
Optionally, in the initialization stage of the current frame, the data signal is a data signal of a previous frame, a data signal of the current frame, or a data signal of a next frame.
Optionally, the method further comprises: a data write module for writing a data signal to the memory module during the threshold compensation phase; and the light-emitting control module controls the light-emitting module not to emit light before the light-emitting stage.
In a second aspect, an embodiment of the present invention further provides a display panel, where the display panel includes the pixel driving circuit described in the first aspect.
According to the technical scheme of the embodiment of the invention, the adopted pixel driving circuit comprises a driving module, the driving module is used for providing driving current to a light-emitting module, and the light-emitting module responds to the driving current; the threshold compensation module is used for capturing the threshold voltage of the driving module to the control end of the driving module in the threshold compensation stage; the storage module is used for maintaining the electric potential of the control end of the driving module; and the first end of the coupling module is electrically connected with the control end of the threshold compensation module, and the second end of the coupling module is electrically connected with the control end of the driving module. By arranging the coupling module, when the threshold compensation stage begins, the potential of the control end of the driving module can be adjusted to the potential of the control end of the driving module when the driving module is cut off, so that less charges only need to be charged when the driving module is cut off in the threshold compensation stage, that is, less charges need to be charged in the threshold compensation stage, the time of the threshold compensation stage can be reduced, and high-frequency driving is facilitated. In addition, only one coupling module is added, and two ends of the coupling module are respectively and electrically connected with the control end of the driving module and the control end of the threshold compensation module, so that additional signal lines do not need to be accessed, and therefore, the display panel adopting the pixel driving circuit of the embodiment can be used for wiring, the design difficulty is simplified, and the cost of the display panel is reduced.
Drawings
Fig. 1 is a schematic circuit structure diagram of a pixel driving circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a threshold compensation module and a coupling module according to an embodiment of the present invention;
FIG. 3 is a timing diagram of a pixel driving circuit according to an embodiment of the present invention;
fig. 4 is a schematic circuit structure diagram of another pixel driving circuit according to an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of another pixel driving circuit according to an embodiment of the present invention;
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 capability of the existing pixel driving circuit is weak at high frequency, the applicant has found through careful study that the reason for this technical problem is: in an existing pixel driving circuit (for example, a 7T1C pixel driving circuit known in the art), a control terminal of a driving module is initialized with a reference signal in an initialization stage, and in a threshold compensation stage, an initial potential of the control terminal of the driving module is a potential of the reference signal, and a difference between the potential of the reference signal and a potential when the driving module is turned off (i.e., threshold compensation is completed) is large, so that a threshold compensation stage needs a long time to complete threshold compensation, and in a high frequency, because a time of each frame is short, a time for threshold compensation is insufficient, so that the existing pixel driving circuit cannot achieve high frequency driving.
In order to solve the technical problems, the invention provides the following solutions:
fig. 1 is a schematic circuit structure diagram of a pixel driving circuit according to an embodiment of the present invention, and referring to fig. 1, the pixel driving circuit includes a driving module 101, the driving module 101 is configured to provide a driving current to a light emitting module 102, and the light emitting module 102 responds to the driving current; the threshold compensation module 103 is used for capturing the threshold voltage of the driving module 101 to the control end of the driving module 101 in the threshold compensation stage by the threshold compensation module 103; the storage module 104, the storage module 104 is used for maintaining the electric potential of the control end of the driving module 101; and a coupling module 105, wherein a first end of the coupling module 105 is electrically connected with a control end of the threshold compensation module 103, and a second end of the coupling module 105 is electrically connected with a control end of the driving module 101.
Specifically, the Light Emitting module 102 may be, for example, an Organic Light Emitting Diode (OLED), the OLED is a current-type device, and the pixel driving circuit can be based on the data voltage VdataProviding corresponding driving current to drive the light emitting module 102 to emit light for display; the light emitting module may include, for example, an anode layer, a hole injection layer, a hole transport layer, an electron blocking layer, a light emitting layer, a hole blocking layer, an electron transport layer, an electron injection layer, and a cathode layer, and the light emitting principle thereof is well known to those skilled in the art and will not be described herein again. The driving process of the pixel driving circuit may include an initialization stage, a threshold compensation stage and a light emitting stage, in this embodiment, in the threshold compensation stage, that is, when the threshold compensation module 103 is turned on, the electric potential of the control terminal of the threshold compensation module 103 changes, which is described by taking the threshold compensation module 103 as a high level off and a low level on as an example, when the electric potential of the control terminal of the threshold compensation module 103 is changed from a high level to a low level in the threshold compensation stage, it is assumed that the electric potential of the control terminal of the threshold compensation module 103 is VGL when the threshold compensation module 103 is turned on, and the electric potential of the control terminal of the threshold compensation module 103 is VGH when the threshold compensation module 103 is turned off, the electric potential of the control terminal of the driving module 101 is pulled down when the threshold compensation stage starts
Wherein the storage module can be a storage capacitor, C1The coupling means may be, for example, a coupling capacitor, C, for the capacitance value of the memory means2The capacitance value of the coupling capacitor is, that is, the control end of the driving module 101 is pulled down at the beginning of the threshold compensation phase, in the threshold compensation process, the driving module 101 and the threshold compensation module 103 are both turned on, and the data voltage Vdata can continue to charge the storage module 104 until the potential of the control end of the driving module 101 is charged to Vdata + Vth, where Vth is the threshold voltage of the driving module 101, and the charging is ended at this time; in the present embodiment, the charge amount charged to the memory module 104 in the threshold compensation phase is Q1 ═ Δ V + Vth (C)1+C2) (ii) a In a conventional pixel driving circuit (e.g., 7T1C pixel driving circuit), the charge amount charged is usually Q2 ═ Vdata + Vth-Vref C1Wherein Vref is a reference voltage,through setting the value of the delta V, namely, the capacitance values of the storage module and the coupling module, the delta V + Vth is far smaller than the Vdata + Vth-Vref, and further the Q1 is far smaller than the Q2, so that the charging time of the storage module can be greatly shortened, and high-frequency driving is realized. In addition, only one coupling module is added, and two ends of the coupling module are respectively and electrically connected with the control end of the driving module and the control end of the threshold compensation module, so that additional signal lines do not need to be accessed, and therefore, the display panel adopting the pixel driving circuit of the embodiment can be used for wiring, the design difficulty is simplified, and the cost of the display panel is reduced.
In the technical scheme of the embodiment, the adopted pixel driving circuit comprises a driving module, wherein the driving module is used for providing driving current to a light-emitting module, and the light-emitting module responds to the driving current; the threshold compensation module is used for capturing the threshold voltage of the driving module to the control end of the driving module in the threshold compensation stage; the storage module is used for maintaining the electric potential of the control end of the driving module; and the first end of the coupling module is electrically connected with the control end of the threshold compensation module, and the second end of the coupling module is electrically connected with the control end of the driving module. By arranging the coupling module, when the threshold compensation stage begins, the potential of the control end of the driving module can be adjusted to the potential of the control end of the driving module when the driving module is cut off, so that less charges only need to be charged when the driving module is cut off in the threshold compensation stage, that is, less charges need to be charged in the threshold compensation stage, the time of the threshold compensation stage can be reduced, and high-frequency driving is facilitated. In addition, only one coupling module is added, and two ends of the coupling module are respectively and electrically connected with the control end of the driving module and the control end of the threshold compensation module, so that additional signal lines do not need to be accessed, and therefore, the display panel adopting the pixel driving circuit of the embodiment can be used for wiring, the design difficulty is simplified, and the cost of the display panel is reduced.
Optionally, the capacitance value of the coupling capacitor is configured to be
Wherein, C1Is the capacitance value of the memory module, C2The Vth is the threshold voltage of the driving module; VGH is the electric potential of its control end when threshold compensation module switches off, VGL is the electric potential of its control end when threshold compensation module switches on.
Specifically, in the present embodiment, the capacitance value C of the coupling capacitor is configured2And a capacitance value C of the memory module1And the value of Δ V- | Vth | is between 0V and 3V, so as to ensure that the potential of the control end of the driving module can be adjusted to the potential of the control end of the driving module when the driving module is cut off in the threshold compensation stage, and preferably, the value of Δ V- | Vth | is set to be close to 0V, for example, less than or equal to 0.1V, so that the charge required to be charged in the threshold compensation stage is less, the driving module is in a conducting state in the threshold compensation stage, and the smooth proceeding of the threshold compensation stage is ensured.
Optionally, as shown in fig. 2, fig. 2 is a schematic structural diagram of a threshold compensation module and a coupling module according to an embodiment of the present invention, referring to fig. 2, a first end of the threshold compensation module includes a first metal plate, the first end of the threshold compensation module is electrically connected to a control end of a driving module, and the control end of the threshold compensation module includes a second metal plate; the first metal plate and the second metal plate are at least partially overlapped to form a coupling capacitor.
Specifically, as shown in fig. 2, the pixel driving circuit may be applied to a display panel, which may include a stacked substrate, an active layer, a gate insulating layer, a gate electrode layer, an interlayer insulating layer, and source and drain metal layers, wherein, the threshold compensation module may include a threshold compensation transistor, a control terminal of the threshold compensation transistor is formed by the second metal substrate and is located on the gate layer, a first terminal of the threshold compensation transistor is electrically connected to the control terminal of the driving module, and the first end of the threshold compensation transistor is formed by the first metal plate and is located on the source drain metal layer, in this embodiment, the coupling capacitor may be formed by overlapping the first metal plate and the second metal plate, and it is understood that the first metal plate and the second metal plate at least partially overlap to at least partially overlap a projection of the first metal plate and a projection of the second metal plate along a direction perpendicular to the display panel; by arranging the first metal polar plate and the second metal polar plate to be at least partially overlapped, the first metal polar plate and the second metal polar plate are reused as two polar plates of the coupling capacitor, the polar plates of the coupling capacitor are not needed to be additionally designed, the design difficulty is reduced, the layout space can be saved, and the aperture opening ratio of the display panel is not needed to be reduced.
Optionally, with continued reference to fig. 1, the pixel driving circuit further comprises: the first end of the first initialization module 106 is connected to the data signal Vdata, the second end of the first initialization module 106 is electrically connected to the control end of the driving module 101, the control end of the first initialization module 106 is connected to the first scanning signal S1, and the first initialization module 106 is configured to initialize the driving module in an initialization stage.
Specifically, fig. 3 is a timing diagram of a pixel driving circuit according to an embodiment of the present invention, and fig. 2 corresponds to fig. 1, and with reference to fig. 1 and fig. 3, the pixel driving circuit may further include a data writing module 108 and a light-emitting control module, the light-emitting control module may further include a first light-emitting control module 109 and a second light-emitting control module 110, a first end of the driving module 101 is electrically connected to a first end of the first light-emitting control module 109, a second end of the driving module 101 is electrically connected to a first end of the second light-emitting control module 110, and a control end of the driving module 101 is electrically connected to a first end of the storage module; a second end of the memory module 104 is electrically connected to a second end of the first lighting control module 109, the second end of the first lighting control module 109 is connected to the first power signal VDD, and a control end of the first lighting control module 109 is connected to the enable signal EM; a second end of the second light emitting control module 110 is electrically connected with a first end of the light emitting module 102, and a control end of the second light emitting control module 110 is connected to the enable signal; a second end of the light emitting control module 102 is connected to a second power signal VSS; a first end of the threshold compensation module 103 is electrically connected with a control end of the driving module, a second end of the threshold compensation module 103 is electrically connected with a second end of the driving module 101, and the control end of the threshold compensation module 103 is connected to the second scanning signal S2; a first end of the data writing module 108 is connected to the data signal Vdata, a second end of the data writing module 108 is electrically connected to a first end of the driving module 101, and a control end of the data writing module 108 is connected to a second endA scan signal S2; as shown in fig. 3, in the present embodiment, a first end of the first initialization module 106 is connected to a data signal Vdata, and in an initialization period T1, the first scan signal S1 controls the first initialization module to be turned on, and a potential written by a control end of the driving module 101 is Vdata at this time; in the threshold compensation period T2, the second scan signal S2 controls the threshold compensation module 103 and the data writing module 108 to be turned on, and since the second scan signal S2 is switched from high to low, the control terminal of the driving module 101 is pulled down by an amount corresponding to the high voltage level
In the process, the storage module needs less charge, thereby being beneficial to high-frequency driving; in the light-emitting period T3, the enable signal EM controls the first light-emitting control module 109 and the second light-emitting control module 110 to be turned on, and at this time, since the second scan signal S2 is pulled from low level to high level, the potential of the control terminal of the driving module 101 can be pulled up to
The driving module 101 generates a current under the action of the first power signal VDD and provides the current to the light emitting module 108, and the light emitting module emits light with the driving current of
And the pressure difference between the first end and the second end of the first initialization module 106 during the lighting phase is
Compared with the conventional pixel driving circuit, the voltage difference between the two ends of the first initialization module 106 can be greatly reduced, that is, the leakage current of the first initialization module 106 is smaller, so that the potential of the control end of the driving module can be kept for a long time, and low-frequency driving can be realized.
Optionally, with continued reference to fig. 1, the pixel driving circuit further comprises: a second initializing module 107, a first end of the second initializing module 107 is connected to the reference signal Vref, a control end of the second initializing module 107 is connected to the first scanning signal, a second end of the second initializing module 107 is electrically connected to the light emitting module 102, and the second initializing module 107 is configured to initialize the light emitting module in an initializing stage.
Specifically, in this embodiment, the second initialization module 107 writes the initialization signal Vref into the light emitting module in the initialization stage, so as to complete initialization of the light emitting module, and avoid the influence of data residue of the previous frame on the current frame, and the reference signal Vref may be set according to the specific type of the light emitting module, for example, may be-3V, so as to initialize the light emitting module better.
Fig. 4 is a schematic circuit structure diagram of another pixel driving circuit according to an embodiment of the present invention, and referring to fig. 4, in this embodiment, the driving module 101, the threshold compensation module 103, the first initialization module 106, the second initialization module 107, the data writing module 108, the first light emission control module 109, and the second light emission control module 110 may be all formed by thin film transistors, for example, N-type thin film transistors or P-type thin film transistors, and preferably, P-type thin film transistors.
Optionally, fig. 5 is a schematic circuit structure diagram of another pixel driving circuit according to an embodiment of the present invention, and referring to fig. 5, different from the structure shown in fig. 1, a first end of a second initialization module 107 and a control end of the second initialization module 107 of the present embodiment both access a first scan signal S1, a second end of the second initialization module 107 is electrically connected to a light emitting module, and the second initialization module 107 is configured to initialize the light emitting module in an initialization stage. In this embodiment, the second initialization module 107 writes the first scan signal S1 into the light emitting module during the initialization phase, so as to complete the initialization of the light emitting module, and the initialization of the light emitting module can be completed without additionally providing a reference signal line, so as to reduce the number of signal lines in the pixel driving circuit, reduce and improve the frame of the display panel, and improve the screen occupation ratio.
Optionally, in the initialization stage of the current frame, the data signal is a data signal of a previous frame, a data signal of the current frame, or a data signal of a next frame.
Specifically, in this embodiment, the control terminal of the driving module is initialized by using the data signal to reduce the potential difference between the two ends of the first initialization module in the light emitting phase and reduce the leakage phenomenon of the first initialization module, and in the initialization phase of the current frame, the data signal for initializing the driving module may be a data signal of a previous frame of the current frame or a data signal of a next frame of the current frame, and is preferably a data signal of the current frame, so that the data signal does not jump during the data writing phase, and it is ensured that the data signal can be accurately and stably written into the storage module.
Fig. 6 is a schematic structural diagram of a display panel according to an embodiment of the present invention, and referring to fig. 6, an embodiment of the present invention further provides a display panel including a plurality of scan lines (GL1-GLk) and the pixel driving circuit 100 according to any embodiment of the present invention.
Specifically, the display panel may include scan lines and data lines (DL1-DLn) that are horizontally and vertically staggered, the scan lines being used for providing corresponding first and second scan signals S1 and S2, the scan lines being electrically connected to the scan driving circuit 30, the data lines being electrically connected to the data driving circuit 20, the display device may further include a light-emitting control signal generating circuit 40 and corresponding enable signal lines (EM1-EMk), the light-emitting control signal generating circuit 40 generating enable signals in the embodiment of the present invention; the display panel may be, for example, a display panel on a mobile phone, a tablet, a display, an MP3, an MP4, a smart watch, a smart helmet, or other wearable devices, and therefore, the display panel includes the pixel driving circuit provided in any embodiment of the present invention, and therefore, the same advantageous effects are also provided, and details are not described herein again.
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 driving circuit, comprising:
a driving module for providing a driving current to a light emitting module, the light emitting module being responsive to the driving current;
the threshold compensation module is used for capturing the threshold voltage of the driving module to the control end of the driving module in the threshold compensation stage;
the storage module is used for maintaining the electric potential of the control end of the driving module;
and the first end of the coupling module is electrically connected with the control end of the threshold compensation module, and the second end of the coupling module is electrically connected with the control end of the driving module.
2. The pixel driving circuit according to claim 1, wherein the coupling module comprises a coupling capacitor.
3. The pixel driving circuit according to claim 2, wherein a capacitance value of the coupling capacitor is configured to:
wherein, C1Is the capacitance value of the memory module, C2The Vth is the threshold voltage of the driving module and is the capacitance value of the coupling capacitor; VGH is the electric potential of the control end of the threshold compensation module when the threshold compensation module is turned off, and VGL is the electric potential of the control end of the threshold compensation module when the threshold compensation module is turned on.
4. The pixel driving circuit according to claim 2, wherein the first terminal of the threshold compensation module comprises a first metal plate, the first terminal of the threshold compensation module is electrically connected to the control terminal of the driving module, and the control terminal of the threshold compensation module comprises a second metal plate;
the first metal plate and the second metal plate are at least partially overlapped to form the coupling capacitor.
5. The pixel driving circuit according to claim 1, further comprising:
the first end of the first initialization module is connected with a data signal, the second end of the first initialization module is electrically connected with the control end of the driving module, the control end of the first initialization module is connected with a first scanning signal, and the first initialization module is used for initializing the driving module in an initialization stage.
6. The pixel driving circuit according to claim 5, further comprising:
a second initialization module, a first end of the second initialization module being connected to a reference signal, a control end of the second initialization module being connected to the first scanning signal, a second end of the second initialization module being electrically connected to the light emitting module, the second initialization module being configured to initialize the light emitting module in an initialization stage.
7. The pixel driving circuit according to claim 5, further comprising:
a second initialization module, a first end of the second initialization module and a control end of the second initialization module access the first scanning signal, a second end of the second initialization module is electrically connected with the light emitting module, and the second initialization module is used for initializing the light emitting module in an initialization stage.
8. The pixel driving circuit according to claim 5, wherein the data signal is a data signal of a previous frame, a data signal of a current frame, or a data signal of a next frame during an initialization stage of the current frame.
9. The pixel driving circuit according to claim 1, further comprising:
a data write module for writing a data signal to the memory module during the threshold compensation phase;
and the light-emitting control module controls the light-emitting module not to emit light before the light-emitting stage.
10. A display panel comprising the pixel driving circuit according to any one of claims 1 to 9.
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| CN202110298286.6A CN112837653A (en) | 2021-03-19 | 2021-03-19 | Pixel driving circuit and display panel |
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| CN202110298286.6A CN112837653A (en) | 2021-03-19 | 2021-03-19 | Pixel driving circuit and display panel |
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| CN114005396A (en) * | 2021-10-29 | 2022-02-01 | 昆山国显光电有限公司 | Pixel circuit and display panel |
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