CN111462696A - Pixel driving circuit, display panel and terminal equipment - Google Patents
Pixel driving circuit, display panel and terminal equipment Download PDFInfo
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- CN111462696A CN111462696A CN202010333703.1A CN202010333703A CN111462696A CN 111462696 A CN111462696 A CN 111462696A CN 202010333703 A CN202010333703 A CN 202010333703A CN 111462696 A CN111462696 A CN 111462696A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3258—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the voltage across the light-emitting element
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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
- G09G3/34—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 by control of light from an independent source
- G09G3/36—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 by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
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- Computer Hardware Design (AREA)
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- Theoretical Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The embodiment of the application provides a pixel driving circuit, a display panel and a terminal device, wherein the pixel driving circuit is provided with a voltage holding unit between the output end of a switch unit of the pixel driving circuit and the control end of a driving transistor unit, the voltage holding unit is connected with a constant voltage source, and the voltage of the constant voltage source is provided for the control end of the driving transistor unit. Namely, in the present application, the voltage holding unit provides a stable voltage to the control terminal of the driving transistor unit. Therefore, under the condition that the voltage at the control end of the driving transistor unit is stable, the working state of the driving transistor unit can be kept stable, the light-emitting state or the non-light-emitting state of the light-emitting device is also stable, and the display gray scale of the display panel is further stable.
Description
Technical Field
The embodiment of the application relates to the technical field of display panels, in particular to a pixel driving circuit, a display panel and a terminal device.
Background
The pixel driving method of the display panel is divided into analog pixel driving and digital pixel driving. The analog pixel driving modulates the light emitting intensity by controlling the driving current of the light emitting element, which has high requirement on the precision of the driving current, and the analog signal is easy to mix noise, so that the gray scale value with high precision is difficult to achieve. The digital pixel drive modulates the luminance by controlling the light emitting area or the light emitting time of the light emitting element, has the advantages of low image noise and high switching speed, and is more and more widely applied.
In the prior art, a pixel driving circuit generally includes a switching transistor, a storage capacitor, and a driving transistor, and the driving transistor operates in a saturation region.
However, the inventor found that, for a display panel with high pixel density, the area of the storage capacitor is small, and the switching transistor has a leakage current in an off state, so that after data is written into the gate of the driving transistor, the storage capacitor has poor capability of maintaining the gate voltage of the driving transistor, and the display gray scale of the display panel is unstable.
Disclosure of Invention
The embodiment of the application provides a pixel driving circuit, a display panel and a terminal device, so as to improve the stability of the display panel in displaying gray scales.
In a first aspect, an embodiment of the present application provides a pixel driving circuit, including: the device comprises a data voltage writing module, a storage module, a first driving voltage writing module, a second driving voltage writing module, a driving module and a light-emitting module;
the control end of the first driving voltage writing module is electrically connected with the data voltage writing module; the first end of the first driving voltage writing module is electrically connected with the high power supply voltage input end; the second end of the first driving voltage writing module is electrically connected with the control end of the driving module;
the control end of the second driving voltage writing module is electrically connected with the data voltage writing module; the first end of the second driving voltage writing module is electrically connected with the low power supply voltage input end; the second end of the second driving voltage writing module is electrically connected with the control end of the driving module;
the data voltage writing module is used for writing data voltage into the control end of the first driving voltage writing module and the control end of the second driving voltage writing module;
the storage module is used for storing the data voltage written by the control end of the first driving voltage writing module or the data voltage written by the control end of the second driving voltage writing module;
the first driving voltage writing module is used for switching on or off according to the voltage of the control end of the first driving voltage writing module, and writing a high voltage signal into the control end of the driving module when the first driving voltage writing module is switched on; the second driving voltage writing module is used for switching on or off according to the voltage of the control end of the second driving voltage writing module, and writing a low-voltage signal into the control end of the driving module when the second driving voltage writing module is switched on; the conduction type of the first driving voltage writing module is opposite to that of the second driving voltage writing module;
the driving module is electrically connected with the light-emitting module and used for driving the light-emitting module to emit light according to the voltage written by the control end of the driving module.
In a possible implementation manner, a control end of the data voltage writing module is electrically connected to a scan voltage input end, a first end of the data voltage writing module is electrically connected to a data voltage input end, and a second end of the data voltage writing module is electrically connected to a control end of the first driving voltage writing module and a control end of the second driving voltage writing module, respectively;
the first end of the storage module is respectively and electrically connected with the control end of the first driving voltage writing module and the control end of the second driving voltage writing module; the second end of the storage module is electrically connected with the first power supply voltage input end;
the first end of the driving module is electrically connected with the first power voltage input end, and the second end of the driving module is electrically connected with the first end of the light-emitting module;
and the second end of the light-emitting module is electrically connected with the second power supply voltage input end.
In one possible implementation manner, the first driving voltage writing module includes a first transistor;
a control electrode of the first transistor is used as a control end of the first driving voltage writing module, a first electrode of the first transistor is used as a first end of the first driving voltage writing module, and a second electrode of the first transistor is used as a second end of the first driving voltage writing module.
In one possible implementation, the second driving voltage writing module includes a second transistor;
and a control electrode of the second transistor is used as a control end of the second driving voltage writing module, a first electrode of the second transistor is used as a first end of the second driving voltage writing module, and a second electrode of the second transistor is used as a second end of the second driving voltage writing module.
In one possible implementation, the first transistor is an n-type transistor and the second transistor is a p-type transistor.
In one possible implementation, the first transistor is a p-type transistor and the second transistor is an n-type transistor.
In one possible implementation, the driving module includes a third transistor;
a control electrode of the third transistor is used as a control end of the driving module, a first electrode of the third transistor is used as a first end of the driving module, and a second electrode of the third transistor is used as a second end of the driving module.
In one possible implementation, the data voltage writing module includes a fourth transistor;
a control electrode of the fourth transistor is used as a control end of the data voltage writing module, a first electrode of the fourth transistor is used as a first end of the data voltage writing module, and a second electrode of the fourth transistor is used as a second end of the data voltage writing module.
In one possible implementation, the memory module includes a capacitive device;
the first pole of the capacitor device serves as one end of the memory module, and the second pole of the capacitor device serves as the second end of the memory module.
In one possible implementation, the light emitting module includes a light emitting device;
the first pole of the light emitting device serves as a first end of the light emitting module, and the second pole of the light emitting device serves as a second end of the light emitting module.
In a second aspect, an embodiment of the present application provides a display panel, including the pixel driving circuit described in the first aspect and any possible implementation manner of the embodiment of the present application, where the pixel driving circuit includes a scan voltage input terminal and a data voltage input terminal; the display panel further includes: the scanning driving circuit, the data driving circuit, a plurality of scanning lines and a plurality of data lines; the port of the scanning driving circuit is electrically connected with the plurality of scanning lines; the scanning voltage input end of the pixel driving circuit is electrically connected with a scanning line, and the data voltage input end of the pixel driving circuit is electrically connected with a data line.
In a third aspect, an embodiment of the present application provides a terminal device, which includes a processing device, a storage device, and the display panel according to the second aspect of the embodiment of the present application.
In the pixel driving circuit, the display panel and the terminal device provided by this embodiment, the voltage holding unit is disposed between the output terminal of the switching unit of the pixel driving circuit and the control terminal of the driving transistor unit, wherein the voltage holding unit is connected to the constant voltage source and supplies the voltage of the constant voltage source to the control terminal of the driving transistor unit. Namely, the method of maintaining the voltage at the control terminal of the driving transistor unit through the storage capacitor in the prior art is replaced by the method of providing a stable voltage for the control terminal of the driving transistor unit through the voltage holding unit in the present application. Therefore, under the condition that the voltage at the control end of the driving transistor unit is stable, the working state of the driving transistor unit can be kept stable, the light-emitting state or the non-light-emitting state of the light-emitting device is also stable, and the display gray scale of the display panel is further stable.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a schematic diagram of a pixel driving circuit in the prior art;
fig. 2 is a schematic structural diagram of a pixel driving circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a pixel driving circuit according to another embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a pixel driving circuit according to another embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a pixel driving circuit according to another embodiment of the present disclosure;
fig. 6 is a schematic diagram of an operation timing sequence of a pixel driving circuit in a sub-frame according to an embodiment of the present disclosure;
fig. 7 is a schematic structural diagram of a pixel driving circuit according to another embodiment of the present disclosure;
fig. 8 is a schematic structural diagram of a pixel driving circuit according to another embodiment of the present disclosure;
fig. 9 is a schematic structural diagram of a pixel driving circuit according to another embodiment of the present disclosure;
fig. 10 is a schematic structural diagram of a display panel according to an embodiment of the present application;
fig. 11 is a schematic structural diagram of a terminal device according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The transistors used in all embodiments of the present application can be transistors, thin film transistors, or field effect transistors or other devices with the same characteristics. In the embodiment of the present application, in order to distinguish two poles of a transistor except for a control pole, one pole is referred to as a first pole, and the other pole is referred to as a second pole.
When the transistor is a triode, the control electrode can be a base electrode, the first electrode can be a collector electrode, and the second electrode can be an emitter electrode; alternatively, the control electrode may be a base electrode, the first electrode may be an emitter electrode, and the second electrode may be a collector electrode.
When the transistor is a thin film transistor or a field effect transistor, the control electrode can be a grid electrode, the first electrode can be a drain electrode, and the second electrode can be a source electrode; alternatively, the control electrode may be a gate electrode, the first electrode may be a source electrode, and the second electrode may be a drain electrode.
Fig. 1 is a schematic structural diagram of a pixel driving circuit in the prior art, and as shown in fig. 1, the pixel driving circuit generally includes a switching transistor T2, a storage capacitor Cst and a driving transistor T1, wherein two ends of the storage capacitor Cst are electrically connected to a gate of the driving transistor T1 and a power voltage terminal VDD, respectively, and the driving transistor operates in a saturation region. For a display panel with high pixel density, the area of the storage capacitor Cst is small, and the switching transistor T2 may have a leakage current in an off state, so that after Data is written to the gate of the driving transistor T1 through the Data line Data, the storage capacitor Cst has poor capability of maintaining the gate voltage of the driving transistor T1, and the display gray scale of the display panel is unstable. For example, when the driving transistor T1 should be turned on, the driving transistor T1 is turned off due to the decrease of the gate voltage, so that the light emitting device does not emit light, or the light emitting time period is not long enough, which affects the display gray scale of the display panel.
In view of this, the embodiments of the present application provide a pixel driving circuit, in which a voltage holding unit is provided, and the gate of the driving transistor T1 obtains a stable gate voltage through the voltage holding unit, so that the operating state of the driving transistor T1 is stable, thereby stabilizing the display gray scale of the display panel.
Fig. 2 is a schematic structure of a pixel driving circuit according to an embodiment of the present disclosure, and as shown in fig. 2, the pixel driving circuit according to the embodiment of the present disclosure includes: a driving transistor unit 200 driving the light emitting device D, a switching unit 100 connected to the Data line Data and the Scan line Scan, respectively, and a voltage holding unit 300. Wherein the voltage holding unit 300 is connected between the output terminal of the switching unit 100 and the control terminal of the driving transistor unit 200, and the voltage holding unit 300 is connected to the constant voltage source S to provide a constant voltage to the control terminal of the driving transistor unit 300.
For the embodiment shown in fig. 2, the working principle is as follows: the switching unit 100 is controlled to be turned on by the voltage on the Scan line Scan, and then the voltage holding unit 300 is controlled to be turned on by the voltage on the Data line Data. Since the voltage holding unit 300 is connected to the constant voltage source S and the voltage holding unit 300 is also connected to the control terminal of the driving transistor unit 200, the voltage holding unit 300 supplies the voltage of the constant voltage source S to the control terminal of the driving transistor unit 200 after the voltage holding unit 300 is activated. Therefore, the control terminal of the driving transistor unit 200 obtains a stable voltage, so that the operating state of the driving transistor unit 200 is stable, and after the driving transistor unit 200 is turned on, the light emitting device D emits light under the action of the power voltage terminal VDD, and the light emitting state of the light emitting device D, which is influenced by the unstable operating state of the driving transistor unit 200, and thus the display gray scale of the display panel is not influenced.
Alternatively, the switching unit 100 includes an n-type transistor or a p-type transistor. For example, when the switching unit 100 includes an n-type transistor, the switching unit 100 is turned on when the voltage on the Scan line Scan is a high voltage. When the switching unit 100 includes a p-type transistor, the switching unit 100 is turned on when the voltage on the Scan line Scan is a low voltage.
Alternatively, the driving transistor unit 200 includes an n-type transistor or a p-type transistor. For example, when the driving transistor unit 200 includes an n-type transistor, the driving transistor unit 200 is turned on and the light emitting device D emits light when the voltage of the control terminal is a high voltage. When the driving transistor unit 200 includes a p-type transistor, the driving transistor unit 200 is turned on and the light emitting device D emits light when the voltage of the control terminal is a low voltage.
It should be noted that the transistors used in all the embodiments of the present application may be transistors, thin film transistors, or field effect transistors or other devices with the same characteristics. When the transistor is a triode, the control end can be a base electrode; when the transistor is a thin film transistor or a field effect transistor, the control terminal may be a gate.
In the embodiment of the application, a voltage holding unit is arranged between the output end of the switch unit of the pixel driving circuit and the control end of the driving transistor unit, wherein the voltage holding unit is connected with the constant voltage source and supplies the voltage of the constant voltage source to the control end of the driving transistor unit. Namely, the method of maintaining the voltage at the control terminal of the driving transistor unit through the storage capacitor in the prior art is replaced by the method of providing a stable voltage for the control terminal of the driving transistor unit through the voltage holding unit in the present application. Therefore, under the condition that the voltage at the control end of the driving transistor unit is stable, the working state of the driving transistor unit can be kept stable, the light-emitting state or the non-light-emitting state of the light-emitting device is also stable, and the display gray scale of the display panel is further stable.
For the embodiment shown in fig. 2, the voltage of the control terminal of the driving transistor unit 200 is the constant voltage source S, so that the operation state of the driving transistor unit 200 can be stabilized. However, whether the constant voltage source S can continuously provide a stable voltage to the control terminal of the driving transistor unit 200 depends on whether the voltage holding unit 300 can maintain the stable operation state. That is, when the light emitting element emits light, the voltage holding unit 300 maintains the on state, so that the control terminal of the driving transistor unit 200 can continuously obtain the voltage from the constant voltage source S; when the light emitting element does not emit light, the voltage holding unit 300 maintains a non-activated state, so that the control terminal of the driving transistor unit 200 cannot obtain a voltage from the constant voltage source S. Therefore, it is necessary to maintain the voltage holding unit 300 in a stable operating state. Therefore, optionally, as shown in fig. 3, a voltage stabilizing unit 400 is provided at the output terminal of the switching unit 100 and the control terminal of the voltage holding unit 300, and the voltage at the control terminal of the voltage holding unit 300 is maintained stable by the voltage stabilizing unit 400.
Optionally, the voltage stabilizing unit 400 includes a capacitor Cst, and the voltage at the control terminal of the voltage keeping unit 300 is maintained stable by using the function of the capacitor that can store energy.
It is understood that the light emitting state of the light emitting device D includes two states of "light emitting" and "no light emitting", and accordingly, the driving transistor unit 200 is in at least two states, and thus the light emitting device D is controlled to be in the two states by the driving transistor unit 200. accordingly, in some embodiments, the constant voltage source S includes a first voltage source VH and a second voltage source V L, and the voltage of the first voltage source VH is higher than that of the second voltage source VH, and the driving transistor unit 200 controls the light emitting device D to be in the two states of "light emitting" and "no light emitting" by supplying voltages of different voltage values to the control terminal of the driving transistor unit 200.
Accordingly, as shown in fig. 4, the voltage holding unit 300 includes a first transistor unit 310 connected to the first voltage source VH and a second transistor unit 320 connected to the second voltage source V L on the basis of the embodiment shown in fig. 2 or fig. 3, wherein fig. 4 is a structural diagram of the pixel driving circuit shown on the basis of fig. 3.
Control terminals of the first transistor unit 310 and the second transistor unit 320 are respectively connected to an output terminal of the switch unit 100, and output terminals of the first transistor unit 310 and the second transistor unit 320 are respectively connected to a control terminal of the driving transistor unit 200.
For the embodiment shown in fig. 4, the operation principle is that the first transistor unit 310 is connected to a voltage source VH, the second transistor unit 320 is connected to a voltage source V L, and the voltage supplied by the voltage source VH is different from the voltage supplied by the voltage source V L, for example, the voltage supplied by the voltage source VH is higher than the voltage supplied by the voltage source V L. thus, the control terminal of the driving transistor unit 200 is supplied with a stable high voltage through the first transistor unit 310, and the driving transistor unit 200 controls the light emitting device D to emit light, and the control terminal of the driving transistor unit 200 is supplied with a stable low voltage through the second transistor unit 320, and the driving transistor unit 200 controls the light emitting device D not to emit light.
It is understood that the control terminals of the first transistor unit 310 and the second transistor unit 320 are both connected to the output terminal of the switch unit 100, i.e. the control terminals of the first transistor unit 310 and the second transistor unit 320 receive the same voltage. Further, it is necessary to control the driving transistor unit 200 to be in different states (on state or off state) through the first transistor unit 310 and the second transistor unit 320, so that the driving transistor unit 200 controls the state (light emission or non-light emission) of the light emitting device D. Therefore, the first transistor unit 310 and the second transistor unit 320 cannot be simultaneously in a turned-on state at the same voltage, that is, when one of the first transistor unit 310 and the second transistor unit 320 is in a turned-on state, the other is in a turned-off state. Thus, when the first transistor unit 310 is turned on and the second transistor unit 320 is not turned on, the driving transistor unit 200 is turned on; when the second transistor unit 320 is turned on and the first transistor unit 310 is not turned on, the driving transistor unit 200 is not turned on.
For example, one of the first transistor unit 310 and the second transistor unit 320 includes an n-type transistor and the other includes a p-type transistor, i.e., when the first transistor unit 310 includes an n-type transistor, the second transistor unit 320 includes a p-type transistor, or when the first transistor unit 310 includes a p-type transistor, the second transistor unit 320 includes an n-type transistor. Thus, when the voltages of the control terminals of the n-type transistor and the p-type transistor are the same, the n-type transistor and the p-type transistor are not turned on at the same time.
It should be noted that, if the first transistor unit 310 includes a p-type transistor and the second transistor unit 320 includes an n-type transistor, the n-type transistor should be normally in an off state when the control terminal of the n-type transistor is at a low voltage (the Data line Data provides a low voltage). however, since the second transistor unit 320 is connected to the voltage source V L, the n-type transistor is in an unstable off state when the control terminal of the n-type transistor is at a low voltage (the Data line Data provides a low voltage), that is, the n-type transistor is also turned on when the control terminal of the n-type transistor is at a low voltage.
On the basis of any of the above embodiments, fig. 5 is a schematic structural diagram of a pixel driving circuit according to another embodiment of the present disclosure, as shown in fig. 5, the switch unit 100 includes an n-type transistor T2, the driving transistor unit 200 includes an n-type transistor T1, the first transistor unit 310 includes an n-type transistor T3, the second transistor unit 320 includes a p-type transistor T4, the voltage stabilizing unit includes a capacitor Cst, and the light Emitting device D is illustrated by using an Organic light Emitting Diode (Organic L light-Emitting Diode, O L ED) as an example.
For the embodiment shown in fig. 5, the working principle is as follows:
the description will be made by taking as an example that the pixel driving circuit employs a sub-field scanning method, in which, when the pixel driving circuit employs the sub-field scanning method, each frame is divided into a plurality of sub-fields in terms of time, for example, each frame is divided into 8 sub-fields (also referred to as 8 sub-frames), the display time of the picture in each sub-field is different, the light emitting time is allocated according to 1:2:4:8:16:32:64:128, and the display period of each sub-field has two states of bright and dark. The n-type transistor T3 and the p-type transistor T4 are controlled to be turned on or off by the Data line Data in each subfield.
In the timing chart of any one subframe, as shown in fig. 6, the control terminal of the N-type transistor T2 is connected to the Scan line Scan, when the Scan line Scan is at a high voltage, the N-type transistor T2 is turned on, when the N-type transistor T2 is turned on, if the Data line Data is written with "1", the voltage of the node N is at a high voltage, at this time, the N-type transistor T3 is turned on, the p-type transistor T4 is turned off, the N-type transistor T3 supplies the voltage of the voltage source VH to the control terminal of the N-type transistor T1, that is, the control terminal of the N-type transistor T1 is shorted with the voltage source VH, so that the N-type transistor T1 is turned on and the light emitting device D emits light, when the Data line Data is written with "0", at this time, the N-type transistor T3, the p-type transistor T4 is turned on, the p-type transistor T4 supplies the voltage of the voltage source 89v L to the control terminal of the N-type transistor T1, that is at a low voltage, that is, at this time, the control terminal of the N-type transistor T1 is turned off, the voltage of the voltage source T L is turned off.
When the Scan line Scan is at a low voltage, the n-type transistor T2 is turned off.
Fig. 7 is a schematic structural diagram of a pixel driving circuit according to another embodiment of the present disclosure, as shown in fig. 7, the switch unit 100 includes an n-type transistor T2, the driving transistor unit 200 includes a p-type transistor T1, the first transistor unit 310 includes an n-type transistor T3, the second transistor unit 320 includes a p-type transistor T4, the voltage stabilizing unit includes a capacitor Cst, and the light emitting device D is illustrated by taking O L ED as an example.
For the embodiment shown in fig. 7, the working principle is as follows: the control terminal of the n-type transistor T2 is connected to the Scan line Scan, and when the Scan line Scan is at a high voltage, the n-type transistor T2 is turned on. When the N-type transistor T2 is turned on and "1" is written to the Data line Data, the voltage at the node N becomes a high voltage. At this time, the n-type transistor T3 is turned on, the p-type transistor T4 is turned off, the n-type transistor T3 supplies the voltage of the voltage source VH to the control terminal of the p-type transistor T1, that is, the control terminal of the p-type transistor T1 is shorted with the voltage source VH, and thus the n-type transistor T1 is turned off, and the light emitting device D does not emit light.
When the Data line Data is written to "0", the voltage of the node N is low, at this time, the N-type transistor T3 is turned off, the p-type transistor T4 is turned on, and the p-type transistor T4 supplies the voltage of the voltage source V L to the control terminal of the p-type transistor T1, i.e., the control terminal of the p-type transistor T1 is shorted to the voltage source V L, so that the p-type transistor T1 is turned on and the light emitting device D emits light, wherein the capacitor Cst is connected to the power voltage terminal VDD to maintain the voltage of the node N stable.
Fig. 8 is a schematic structural diagram of a pixel driving circuit according to another embodiment of the present disclosure, as shown in fig. 8, the switch unit 100 includes a p-type transistor T2, the driving transistor unit 200 includes a p-type transistor T1, the first transistor unit 310 includes an n-type transistor T3, the second transistor unit 320 includes a p-type transistor T4, the voltage stabilizing unit includes a capacitor Cst, and the light emitting device D is illustrated by taking O L ED as an example.
For the embodiment shown in fig. 8, the working principle is as follows: the control terminal of the p-type transistor T2 is connected to the Scan line Scan, and when the Scan line Scan is at a low voltage, the p-type transistor T2 is turned on. When the p-type transistor T2 is turned on and "1" is written to the Data line Data, the voltage at the node N becomes a high voltage. At this time, the n-type transistor T3 is turned on, the p-type transistor T4 is turned off, the n-type transistor T3 supplies the voltage of the voltage source VH to the control terminal of the p-type transistor T1, that is, the control terminal of the p-type transistor T1 is shorted with the voltage source VH, and thus, the p-type transistor T1 is turned off, and the light emitting device D does not emit light.
When the Data line Data is written to "0", the voltage of the node N is low, at this time, the N-type transistor T3 is turned off, the p-type transistor T4 is turned on, and the p-type transistor T4 supplies the voltage of the voltage source V L to the control terminal of the p-type transistor T1, i.e., the control terminal of the p-type transistor T1 is shorted to the voltage source V L, so that the p-type transistor T1 is turned on and the light emitting device D emits light, wherein the capacitor Cst is connected to the power voltage terminal VDD to maintain the voltage of the node N stable.
Fig. 9 is a schematic structural diagram of a pixel driving circuit according to another embodiment of the present disclosure, as shown in fig. 9, the switch unit 100 includes a p-type transistor T2, the driving transistor unit 200 includes an n-type transistor T1, the first transistor unit 310 includes an n-type transistor T3, the second transistor unit 320 includes a p-type transistor T4, the voltage stabilizing unit includes a capacitor Cst, and the light emitting device D is illustrated by taking O L ED as an example.
For the embodiment shown in fig. 9, the working principle is as follows: the control terminal of the p-type transistor T2 is connected to the Scan line Scan, and when the Scan line Scan is at a low voltage, the p-type transistor T2 is turned on. When the p-type transistor T2 is turned on and "1" is written to the Data line Data, the voltage at the node N becomes a high voltage. At this time, the n-type transistor T3 is turned on, the p-type transistor T4 is turned off, the n-type transistor T3 supplies the voltage of the voltage source VH to the control terminal of the n-type transistor T1, that is, the control terminal of the n-type transistor T1 is shorted with the voltage source VH, and thus, the n-type transistor T1 is turned on, and the light emitting device D emits light.
When the Data line Data is written to "0", the voltage of the node N is low, at this time, the N-type transistor T3 is turned off, the p-type transistor T4 is turned on, and the p-type transistor T4 supplies the voltage of the voltage source V L to the control terminal of the N-type transistor T1, that is, the control terminal of the N-type transistor T1 is shorted to the voltage source V L, so that the N-type transistor T1 is turned off and the light emitting device D does not emit light, wherein the capacitor Cst is connected to the power voltage terminal VDD to maintain the voltage of the node N stable.
As can be seen from fig. 6 to 9, based on the inventive concept of the present application, the structures of the switching unit 100, the driving transistor unit 200, the first transistor unit 310, and the second transistor unit 320 in the pixel driving circuit may be various types, and the present application is not particularly limited thereto.
Fig. 10 is a schematic structural diagram of a display panel provided in this embodiment of the present application, where the display panel includes a pixel driving circuit provided in any embodiment of the present application. The pixel driving circuit includes a Scan voltage input terminal Scan and a Data voltage input terminal Data. The display panel further includes: a scan driving circuit 210, a data driving circuit 220, a plurality of scan lines (S1, S2, S3, S4 … …), and a plurality of data lines (D1, D2, D3, D4 … …). The port of the Scan driving circuit 210 is electrically connected to a plurality of Scan lines, the Scan voltage input terminal Scan of the pixel driving circuit 220 is electrically connected to one Scan line, and the Data voltage input terminal of the pixel driving circuit is electrically connected to one Data line.
It should be noted that the Data voltage input terminal Data and the Scan voltage input terminal Scan of the pixel circuit for driving one sub-pixel are only schematically illustrated in the figure, and the ports of the pixel circuits for driving the other sub-pixels are similar to the sub-pixel and are not illustrated one by one here.
The display panel provided by the embodiment of the application has the same beneficial effects as the pixel driving circuit provided by any embodiment of the application.
Fig. 11 is a schematic structural diagram of a terminal Device according to an embodiment of the present disclosure, and as shown in fig. 11, the terminal Device may include, but is not limited to, a mobile terminal such as a mobile phone, a notebook computer, a digital broadcast receiver, a Personal Digital Assistant (PDA), a tablet computer (PAD), a Portable Multimedia Player (PMP), a vehicle-mounted terminal (e.g., a car navigation terminal), and a fixed terminal such as a digital TV, a desktop computer, and the like. The terminal device shown in fig. 11 is only an example, and should not bring any limitation to the functions and the scope of use of the embodiments of the present disclosure.
As shown in fig. 11, the terminal device may include a processing means (e.g., a central processing unit, a graphics processor, etc.) 901, which can perform various appropriate actions and processes according to a program stored in a Read Only Memory (ROM) 902 or a program loaded from a storage means 908 into a Random Access Memory (RAM) 903. In the RAM 903, various programs and data necessary for the operation of the terminal device are also stored. The processing apparatus 901, the ROM 902, and the RAM 903 are connected to each other through a bus 904. An input/output (I/O) interface 905 is also connected to bus 904.
Generally, input devices 906 including, for example, a touch screen, touch pad, keyboard, mouse, camera, microphone, accelerometer, gyroscope, etc., a Display panel 907 including, for example, a liquid crystal Display (L acquired crystalline Display, abbreviated L CD), an Organic light Emitting Display (Organic L bright Display, abbreviated O L ED), etc., a storage device 908 including, for example, a magnetic tape, a hard disk, etc., and a communication device 909 may allow the terminal device to communicate wirelessly or wiredly with other devices to exchange data.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. A pixel driving circuit, comprising:
a driving transistor unit driving the light emitting device;
a switching unit connected to the data line and the scan line, respectively;
and a control end of the driving transistor unit is connected with the output end of the switch unit: a voltage holding unit; the voltage holding unit is connected to a constant voltage source to supply a constant voltage to the control terminal of the driving transistor unit.
2. The circuit of claim 1, wherein the constant voltage source comprises: a first voltage source and a second voltage source, the voltage of the first voltage source being higher than the voltage of the second voltage source;
the voltage holding unit includes: a first transistor unit connected to the first voltage source, a second transistor unit connected to the second voltage source;
the control ends of the first transistor unit and the second transistor unit are respectively connected with the output end of the switch unit, and the output ends of the first transistor unit and the second transistor unit are respectively connected with the control end of the driving transistor unit.
3. The circuit of claim 2, wherein one of the first transistor unit and the second transistor unit is in an on state and the other is in an off state.
4. The circuit of claim 3, wherein one of the first transistor unit and the second transistor unit comprises: an n-type transistor and the other comprising a p-type transistor.
5. The circuit of claim 1, wherein the driving transistor unit comprises: an n-type transistor or a p-type transistor.
6. The circuit according to any one of claims 1 to 5, wherein the switching unit comprises: an n-type transistor or a p-type transistor.
7. The circuit according to any one of claims 1 to 5, wherein the output terminal of the switching unit and the control terminal of the voltage holding unit are further connected with: and the voltage stabilizing unit is used for stabilizing the input voltage of the control end of the voltage holding unit.
8. The circuit of claim 7, wherein the voltage regulator unit comprises a capacitor.
9. A display panel comprising the pixel driving circuit according to any one of claims 1 to 8.
10. A terminal device characterized in that the display panel of claim 9 is provided on the display device.
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| CN202010333703.1A CN111462696A (en) | 2020-04-24 | 2020-04-24 | Pixel driving circuit, display panel and terminal equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010333703.1A CN111462696A (en) | 2020-04-24 | 2020-04-24 | Pixel driving circuit, display panel and terminal equipment |
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| CN111462696A true CN111462696A (en) | 2020-07-28 |
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| CN202010333703.1A Pending CN111462696A (en) | 2020-04-24 | 2020-04-24 | Pixel driving circuit, display panel and terminal equipment |
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