CN110415650A - Display panel, pixel-driving circuit and its control method - Google Patents
Display panel, pixel-driving circuit and its control method Download PDFInfo
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- CN110415650A CN110415650A CN201910837634.5A CN201910837634A CN110415650A CN 110415650 A CN110415650 A CN 110415650A CN 201910837634 A CN201910837634 A CN 201910837634A CN 110415650 A CN110415650 A CN 110415650A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3275—Details of drivers for data electrodes
- G09G3/3291—Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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- Theoretical Computer Science (AREA)
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Abstract
The invention discloses a kind of display panel, pixel-driving circuit and its control methods, wherein pixel-driving circuit includes: storage capacitance；First driving transistor and the second driving transistor；Light-emitting component；Control module, control module alternately drives work for controlling the first driving transistor and the second driving transistor, it is shone with driven light-emitting component, and in the first driving light emission drive transistor element, control the second driving transistor carries out threshold voltage compensation, and in the second driving light emission drive transistor element, control the first driving transistor carries out threshold voltage compensation.The pixel-driving circuit can pass through double drive TFT and carry out lighting for threshold voltage compensation and light-emitting component simultaneously, help to simplify driving process, improve the charge efficiency of storage capacitance, improve refresh rate, eliminate or reduce influence of the threshold voltage to picture brightness unevenness.
Description
Technical field
The present invention relates to field of display technology more particularly to a kind of pixel-driving circuit, a kind of display panel and a kind of picture
The control method of plain driving circuit.
Background technique
TFT (Thin Film Transistor, thin film transistor (TFT)) in pixel-driving circuit uses low temperature polycrystalline silicon more
Thin film transistor (TFT), the spatial variation of intrinsic threshold voltage vt h has the display picture using the device drive can not
The influence of ignorance.
Pixel-driving circuit usually has threshold voltage vt h compensation driving in the related technology, including voltage compensation, electric current are mended
It repays, mixed compensation, gray scale time ratio, gray scale area ratio etc..Wherein, electricity used by the threshold voltage vt h of compensation driving TFT pipe
Pressure compensation method are as follows: the driving voltage of the h containing threshold voltage vt is first obtained, then lights light-emitting component, however, in high-resolution,
It is limited by the signal refreshing row period, the charge rate deficiency of storage capacitance charging will cause voltage and obtain deficiency when Vth is obtained.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.For this purpose, of the invention
One purpose is to propose a kind of pixel-driving circuit, threshold voltage compensation can be carried out simultaneously by double drive TFT and shone
Element is lighted, and is helped to simplify driving process, is improved the charge efficiency of storage capacitance, improves refresh rate, and threshold is eliminated or reduce
Influence of the threshold voltage to picture brightness unevenness.
It is another object of the present invention to propose a kind of display panel.
Yet another object of the invention is that proposing a kind of control method of pixel-driving circuit.
In order to achieve the above object, first aspect present invention embodiment proposes a kind of pixel-driving circuit, comprising: storage electricity
Hold；First driving transistor and the second driving transistor, the control electrode of the first driving transistor and second driving are brilliant
The control electrode of body pipe is connected, and is connected with the storage capacitance；Light-emitting component；Control module, the control module and described the
One driving transistor, the second driving transistor are connected with the light-emitting component, and the control module is used to control described the
One driving transistor and the second driving transistor alternately drive work, are shone with light-emitting component described in driven,
And when the light-emitting component described in the first driving transistor driving, controls the second driving transistor and carry out threshold voltage benefit
It repays, and, when described second drives light-emitting component described in transistor driving, controls the first driving transistor and carry out threshold value
Voltage compensation.
Pixel-driving circuit according to an embodiment of the present invention can carry out simultaneously threshold voltage compensation by double drive TFT
With lighting for light-emitting component, help to simplify driving process, improve the charge efficiency of storage capacitance, improve refresh rate, eliminate or
Reduce influence of the threshold voltage to picture brightness unevenness.
In addition, the pixel-driving circuit of the above embodiment of the present invention can also have the following additional technical features:
According to one embodiment of present invention, the control module includes: the first control submodule, the first control
Module is connected with the first control terminal, the first driving transistor, the second driving transistor and the light-emitting component, described
First control submodule is used for the first control signal according to first control terminal, controls the second driving transistor and carries out
Threshold voltage compensation, while controlling the first driving transistor and carrying out driving work；Second control submodule, second control
System module is connected with the second control terminal, the first driving transistor, the second driving transistor and the light-emitting component,
Second control submodule is used for the second control signal according to second control terminal, controls the first driving transistor
Threshold voltage compensation is carried out, while controlling the second driving transistor and carrying out driving work.
According to one embodiment of present invention, first control submodule includes: the first write-in compensating unit, and described
One write-in compensating unit is connected with first control terminal, data terminal and the second driving transistor, and first write-in is mended
Unit is repaid for the first control signal according to first control terminal, controls the write-in of the data voltage of the data terminal, and
It controls the second driving transistor and threshold voltage compensation is carried out to the data voltage of write-in, compensated data voltage is mentioned
It is supplied to the first driving transistor；First drive control unit, first drive control unit and first control terminal,
The first driving transistor is connected with the light-emitting component, and first driving unit is used for according to first control terminal
First control signal controls the first driving transistor and carries out driving work, wherein the first driving of driving transistor root
The light-emitting component is driven to shine according to compensated data voltage.
According to one embodiment of present invention, second control submodule includes: the second write-in compensating unit, and described
Two write-in compensating units are connected with second control terminal, data terminal and the first driving transistor, and second write-in is mended
Unit is repaid for the second control signal according to second control terminal, controls the write-in of the data voltage of the data terminal, and
It controls the first driving transistor and threshold voltage compensation is carried out to the data voltage of write-in, compensated data voltage is mentioned
It is supplied to the second driving transistor；Second drive control unit, second drive control unit and second control terminal,
The second driving transistor is connected with the light-emitting component, and second driving unit is used for according to second control terminal
Second control signal controls the second driving transistor and carries out driving work, wherein the second driving of driving transistor root
The light-emitting component is driven to shine according to compensated data voltage.
According to one embodiment of present invention, the first write-in compensating unit includes the first transistor and the second crystal
Pipe, the first pole of the first transistor are connected with the data terminal, and the second pole of the first transistor and described second is driven
The first of dynamic transistor is extremely connected, and the first pole of the second transistor is extremely connected with the second of the second driving transistor,
Second pole of the second transistor is connected with the control electrode of the second driving transistor, the control electrode of the first transistor
It is connected with the control electrode of the second transistor with first control terminal；First drive control unit includes third crystal
Pipe and the 4th transistor, the first pole of the third transistor are connected with one end of the first power supply and storage capacitance, the third
Second pole of transistor first is extremely connected with the first driving transistor, the first pole of the 4th transistor and described the
The second of one driving transistor is extremely connected, and the second pole of the 4th transistor is connected with the anode of the light-emitting component, described
The control electrode of third transistor and the control electrode of the 4th transistor are connected with first control terminal, wherein the storage
The other end of capacitor is connected with the control electrode of the first driving transistor.
According to one embodiment of present invention, the second write-in compensating unit includes the 5th transistor and the 6th crystal
Pipe, the first pole of the 5th transistor are connected with the data terminal, and the second pole of the 5th transistor and described first is driven
The first of dynamic transistor is extremely connected, and the first pole of the 6th transistor is extremely connected with the second of the first driving transistor,
Second pole of the 6th transistor is connected with the control electrode of the first driving transistor, the control electrode of the 5th transistor
It is connected with the control electrode of the 6th transistor with second control terminal；Second drive control unit includes the 7th crystal
Pipe and the 8th transistor, the first pole of the 7th transistor are connected with one end of the first power supply and storage capacitance, and the described 7th
Second pole of transistor first is extremely connected with the second driving transistor, the first pole of the 8th transistor and described the
The second of two driving transistors is extremely connected, and the second pole of the 8th transistor is connected with the anode of the light-emitting component, described
The control electrode of 7th transistor and the control electrode of the 8th transistor are connected with second control terminal, wherein the storage
The other end of capacitor is connected with the control electrode of the second driving transistor.
According to one embodiment of present invention, pixel-driving circuit, further includes: initialization module, the initialization module
The control of transistor is driven with initialization end, reference voltage offer end, the control electrode of the first driving transistor, described second
Pole is connected with the anode of the light-emitting component, and the initialization module is used for the control in the initializing signal at the initialization end
Under, according to the reference voltage provide end provide reference voltage to it is described first driving transistor control electrode, described second
The anode of the control electrode and the light-emitting component that drive transistor is initialized.
According to one embodiment of present invention, the initialization module includes: the 9th transistor, the 9th transistor
First pole is connected with the control electrode of the control electrode of the first driving transistor and the second driving transistor, and the described 9th is brilliant
Second pole of body pipe provides end with the reference voltage and is connected, control electrode and the initialization end phase of the 9th transistor
Even；First pole of the tenth transistor, the tenth transistor is connected with the anode of the light-emitting component, the tenth transistor
Second pole provides end with the reference voltage and is connected, and the control electrode of the tenth transistor is connected with the initialization end.
In order to achieve the above object, second aspect of the present invention embodiment proposes a kind of display panel, including first is invented at all
The pixel-driving circuit that aspect embodiment proposes.
The display panel of the embodiment of the present invention, pixel-driving circuit through the embodiment of the present invention can pass through double drive
TFT carries out lighting for threshold voltage compensation and light-emitting component simultaneously, helps to simplify driving process, improves the charging of storage capacitance
Efficiency improves refresh rate, eliminates or reduce influence of the threshold voltage to picture brightness unevenness.
In order to achieve the above object, third aspect present invention embodiment proposes a kind of control method of plain driving circuit, including
Following steps: the first driving transistor and the second luminous member of driving transistor driven in the pixel-driving circuit are controlled
Part shines；When described first drives light-emitting component described in transistor driving, controls the second driving transistor and carry out threshold value
Voltage compensation；And when it is described second driving transistor driving described in light-emitting component when, control it is described first driving transistor into
Row threshold voltage compensation.
The control method of the pixel-driving circuit of the embodiment of the present invention can carry out simultaneously threshold value electricity by double drive TFT
Pressure compensation is lighted with light-emitting component, is helped to simplify driving process, is improved the charge efficiency of storage capacitance, improves refresh rate,
Eliminate or reduce influence of the threshold voltage to picture brightness unevenness.
Detailed description of the invention
Fig. 1 is the structural block diagram of pixel-driving circuit according to an embodiment of the present invention；
Fig. 2 is the structural block diagram of control module according to an embodiment of the invention；
Fig. 3 is the structural block diagram of exemplary first control submodule according to the present invention；
Fig. 4 is the structural block diagram of exemplary second control submodule according to the present invention；
Fig. 5 is the structural schematic diagram of an exemplary pixel-driving circuit according to the present invention；
Fig. 6 is the timing diagram of the corresponding each signal of the pixel-driving circuit in Fig. 5；
Fig. 7 is the structural block diagram of display panel according to an embodiment of the present invention；
Fig. 8 is the flow chart of the control method of pixel-driving circuit according to an embodiment of the present invention.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
Fig. 1 is the structural block diagram of pixel-driving circuit according to an embodiment of the present invention.
As shown in Figure 1, the pixel-driving circuit 100 includes: storage capacitance C1, the first driving transistor M1, the second driving
Transistor M2, light-emitting component 10 and control module 20.
Wherein, first driving transistor M1 control electrode with second drive transistor M2 control electrode be connected, and with storage
Capacitor C1 is connected；Control module 20 is connected with the first driving transistor M1, the second driving transistor M2 and light-emitting component 10, controls
Module 20 alternately drives work for controlling the first driving transistor M1 and the second driving transistor M2, is sent out with driven
Optical element 10 shines, and in the first driving transistor M1 driving light-emitting component 10, the second driving of control transistor M2 carries out threshold
Threshold voltage compensation, and, in the second driving transistor M2 driving light-emitting component 10, the first driving of control transistor M1 carries out threshold
Threshold voltage compensation.
Specifically, when the pixel-driving circuit 100 works, storage capacitance C1 can be carried out within the odd number refresh cycle
Charging, and then the control of control module 20 first driving light emission drive transistor element 10 shines, while controlling the second driving crystal
Pipe M2 carries out threshold voltage compensation；Within the even number refresh cycle, charge to storage capacitance C1, the control of control module 20 second
It drives transistor M2 to drive light-emitting component 10, while controlling the first driving transistor M1 and carrying out threshold voltage compensation, and then realizing
First driving transistor M1 of the control of control module 20 and the second driving transistor M2 alternately drive work, are sent out with driven
Optical element 10 shines, and while driving shines, carries out threshold voltage compensation.
In the embodiment, the first driving transistor M1 and the second driving transistor M2 can drive TFT for p-type, and be two
The identical driving TFT of a size, i.e., when its grid (control electrode) voltage is low level, the first driving transistor M1 and second is driven
Dynamic transistor M2 conducting.Light-emitting component 10 can be OLED (Organic Light Emitting Diode, organic light-emitting diodes
Pipe).
The pixel-driving circuit can pass through double drive TFT and carry out threshold voltage compensation and light-emitting component simultaneously as a result,
It lights, helps to simplify driving process, improve the charge efficiency of storage capacitance, improve refresh rate, eliminate or reduce threshold voltage
Influence to picture brightness unevenness.
The specific embodiment within odd number refresh cycle and even number refresh cycle is described below according to multiple examples.
In one embodiment of the invention, as shown in Fig. 2, control module 20 may include the first control submodule 21 and
Two control submodules 22.
Wherein, as shown in Fig. 2, the first control submodule 21 and the first control terminal SCAN1, the first driving transistor M1, the
Two driving transistor M2 are connected with light-emitting component 10, and the first control submodule 21 is used for according to the first of the first control terminal SCAN1
Signal is controlled, the second driving of control transistor M2 carries out threshold voltage compensation, while controlling the first driving transistor M1 and being driven
It starts building to make；Second control submodule 22 and the second control terminal SCAN2, the first driving transistor M1, the second driving transistor M2 and
Light-emitting component 10 is connected, and the second control submodule 22 is used for the second control signal according to the second control terminal SCAN2, control first
It drives transistor M1 to carry out threshold voltage compensation, while controlling the second driving transistor M2 and carrying out driving work.
Specifically, in the pixel-driving circuit 100 work, it can be within the odd number refresh cycle, the first control submodule
21 shine according to the first control signal of the first control terminal SCAN1 control the first driving transistor M1 driving light-emitting component 10, together
When control second driving transistor M2 carry out threshold voltage compensation；Within the even number refresh cycle, 22 basis of the second control submodule
Second control signal control the second driving transistor M2 driving light-emitting component 10 of second control terminal SCAN2 shines, and controls simultaneously
First driving transistor M1 carries out threshold voltage compensation.
That is, control module 20 passes through the first control submodule 21 and the second control at each moment of refresh cycle
System module 22, control the first driving transistor M1 and second drive one of light emission drive transistor member in transistor M2
Part 10 (OLED) shines, and while driving shines, it controls another transistor and carries out threshold voltage compensation, refreshed with improving
Efficiency.
In an example of the invention, as shown in figure 3, the first control submodule 21 may include the first write-in compensating unit
211 and first drive control unit 212.
Wherein, the first write-in compensating unit 211 and the first control terminal SCAN1, data terminal Vdata and the second driving transistor
M2 is connected, and the first write-in compensating unit 211 is used for the first control signal according to the first control terminal SCAN1, controls data terminal
The write-in of the data voltage of Vdata, and control the second driving transistor M2 and threshold voltage compensation is carried out to the data voltage of write-in,
Compensated data voltage is provided to the first driving transistor M1；First drive control unit 212 and the first control terminal
SCAN1, the first driving transistor M1 are connected with light-emitting component 10, and the first drive control unit 212 is used for according to the first control terminal
The first control signal of SCAN1, the first driving of control transistor M1 carry out driving work, wherein driving the first driving transistor
M1 drives light-emitting component 10 to shine according to compensated data voltage.
Specifically, can within the odd number refresh cycle, the first control submodule 21 control second driving transistor M2 into
When row threshold voltage compensation, the first write-in compensating unit 211 controls data terminal according to the control signal of the first control terminal SCAN1
Data voltage write-in the first write-in compensating unit 211 of Vdata, to obtain compensated data voltage, and then will be after the compensation
Data voltage be sent to driving light-emitting component 10 (OLED) it is luminous first driving transistor M1 so that first driving transistor
M1 drives light-emitting component 10 to shine according to compensated data voltage.
As a result, by the first write-in compensating unit of the first control submodule and the first driving unit, realize in odd number brush
It is driven and is lighted simultaneously by double drive TFT in the new period, improve refresh rate.
In an example of the invention, as shown in figure 4, the second control submodule 22 can include: the second write-in compensation is single
Member 221 and the second drive control unit 222.
Wherein, the second write-in compensating unit 221 and the second control terminal SCAN2, data terminal Vdata and the first driving transistor
M1 is connected, and the second write-in compensating unit 221 is used for the second control signal according to the second control terminal SCAN2, controls data terminal
The write-in of the data voltage of Vdata, and control the first driving transistor M1 and threshold voltage compensation is carried out to the data voltage of write-in,
Compensated data voltage is provided to the second driving transistor M2；Second drive control unit 222 and the second control terminal
SCAN2, the second driving transistor M2 are connected with light-emitting component 10, and the second drive control unit 222 is used for according to the second control terminal
Second control signal, control second driving transistor M2 carry out driving work, wherein driving second driving transistor M2 according to
Compensated data voltage driving light-emitting component 10 shines.
Specifically, can be carried out within the even refresh cycle in the first driving of the second control submodule 22 control transistor M1
When threshold voltage compensation, the second write-in compensating unit 221 controls data terminal according to the control signal of the second control terminal SCAN2
Data voltage write-in the second write-in compensating unit 221 of Vdata, to obtain compensated data voltage, and then the second write-in is mended
It repays unit 221 and the compensated data voltage is sent to the second luminous driving transistor of driving light-emitting component 10 (OLED)
M2, so that the second driving transistor M2 drives light-emitting component 10 to shine according to compensated data voltage.
As a result, by the second write-in compensating unit of the second control submodule and the second driving unit, realize in even number brush
It is driven and is lighted simultaneously by double drive TFT in the new period, improve refresh rate.
Further, in an example of the invention, referring to Fig. 3, the first write-in compensating unit 211 may include the first crystalline substance
Body pipe Q1 and second transistor Q2.
Wherein, as shown in figure 5, the first pole of the first transistor Q1 is connected with data terminal, the second pole of the first transistor Q1
Extremely it is connected with the first of the second driving transistor M2, the second pole of the first pole of second transistor Q2 and the second driving transistor M2
It is connected, the second pole of second transistor Q2 is connected with the control electrode of the second driving transistor M2, the control electrode of the first transistor Q1
It is connected with the control electrode of second transistor Q2 with the first control terminal；First drive control unit 212 include third transistor Q3 and
The first pole of 4th transistor Q4, third transistor Q3 are connected with one end of the first power supply and storage capacitance C1, third transistor
The second pole of Q3 is extremely connected with the first of the first driving transistor M1, the first pole of the 4th transistor Q4 and the first driving transistor
The second of M1 is extremely connected, and the second pole of the 4th transistor Q4 is connected with the anode of light-emitting component 10, the control of third transistor Q3
The control electrode of pole and the 4th transistor Q4 are connected with the first control terminal, wherein the other end of storage capacitance C1 and the first driving are brilliant
The control electrode of body pipe M2 is connected.
Referring to Fig. 4, the second write-in compensating unit 221 includes the 5th transistor Q5 and the 6th transistor Q6.
Wherein, referring to Fig. 5, the first pole of the 5th transistor Q5 is connected with data terminal, the second pole of the 5th transistor Q5 and
The first of first driving transistor M1 is extremely connected, the second pole phase of the first pole of the 6th transistor Q6 and the first driving transistor M1
Even, the second pole of the 6th transistor Q6 drives the control electrode of transistor M1 to be connected with first, the control electrode of the 5th transistor and the
The control electrode of six transistors is connected with the second control terminal；
Second drive control unit 222 include the 7th transistor Q7 and the 8th transistor Q8, the first of the 7th transistor Q7
Pole is connected with one end of the first power vd D and storage capacitance C1, the second pole of the 7th transistor Q7 and the second driving transistor M2
First be extremely connected, the first pole of the 8th transistor Q8 drives second being extremely connected for transistor M2, the 8th transistor Q8 with second
The second pole be connected with the anode of light-emitting component 10, the control electrode of the control electrode of the 7th transistor Q7 and the 8th transistor Q8 and the
Two control terminals are connected, wherein the other end of storage capacitance C1 is connected with the control electrode of the second driving transistor M2.
It should be noted that (the first transistor Q1 to the 8th transistor Q8) can be P to each transistor in the embodiment
Type TFT (switching mode TFT), the first pole, the second pole and control electrode are respectively source electrode, drain and gate.
Specifically, it can control the second driving transistor M2 within the odd number refresh cycle and carry out threshold voltage compensation, and will mend
Threshold voltage after repaying is provided to the first driving transistor M1, with the first driving transistor M1 of control according to compensated threshold value electricity
Pressure driving light-emitting component OLED shines.
Specifically, applying first control signal in the first control terminal SCAN1, so that the first transistor Q1, the second crystal
Pipe Q2, third transistor Q3 and the 4th transistor Q4 conducting, wherein the conducting of second transistor Q2 is so that the second driving transistor
The grid (g) of M2 and drain electrode (d) are shorted, and the voltage Vsd between the source electrode (s) and drain electrode of the second driving transistor M2 is the at this time
The threshold voltage of two driving transistor M2 | Vth1 |, at this point, the voltage of Q point is Vdata- | Vth1 |, second transistor Q2, the 4th
The conducting of transistor Q4 makes the first driving transistor M1 start to work, to drive light-emitting component OLED to shine, therefore it is available,
First driving transistor M1 grid voltage Vg=Vdata- | Vth1 |, source voltage Vs=VDD, and by first drive transistor
The threshold voltage settings of M1 are Vth2, drive crystal first at this point, obtaining light-emitting component OLED below by two examples
Pipe M1 works in driving current when different mode:
It is understood that driving light-emitting component OLED to be sent out by the 4th transistor Q4 in the first driving transistor M1
Light time, the driving current of light-emitting component OLED are the electric current flowed through between the drain electrode and source electrode of the first driving transistor M1.
Example one: the electric current when the first driving transistor M1 works in linear drive mode, between drain electrode and source electrode
Are as follows:
Wherein, it is the first driving transistor that Vgs, which is voltage, Vds between the grid and source electrode of the first driving transistor M1,
Voltage, k between the drain electrode and source electrode of M1 are channel feature and electron mobility parameter, and opposite Vth is steadiness parameter easy to control.
First driving transistor M1 grid voltage Vg=Vdata- | Vth1 |, source voltage Vs=VDD, threshold voltage
When for Vth2, by the driving current of the available light-emitting component OLED of above-mentioned formula (1) are as follows:
Example two: the electric current when the first driving transistor M1 works in driven saturated mode, between drain electrode and source electrode
Are as follows:
First driving transistor M1 grid voltage Vg=Vdata- | Vth1 |, source voltage Vs=VDD, threshold voltage
When for Vth2, by the driving current of the available light-emitting component OLED of above-mentioned formula (2) are as follows:
Specifically, it can control the first driving transistor M1 within the even number refresh cycle and carry out threshold voltage compensation, and will mend
Threshold voltage after repaying is provided to the second driving transistor M2, with the second driving transistor M2 of control according to compensated threshold value electricity
Pressure driving light-emitting component OLED shines.
Specifically, applying second control signal in the second control terminal SCAN2, so that the 5th transistor Q5, the 6th crystal
Pipe Q6, the 7th transistor Q7 and the 8th transistor Q8 conducting, wherein the conducting of the 6th transistor Q6 is so that the first driving transistor
The grid (g) of M1 and drain electrode (d) are shorted, and the voltage Vsd between the source electrode (s) and drain electrode of the first driving transistor M1 is the at this time
The threshold voltage of one driving transistor M2 | Vth2 |, at this point, the voltage of Q point is Vdata- | Vth2 |, the 7th transistor Q7, the 8th
The conducting of transistor Q8 makes the second driving transistor M2 start to work, to drive light-emitting component OLED to shine, therefore it is available,
Second driving transistor M2 grid voltage Vg=Vdata- | Vth2 |, source voltage Vs=VDD, and by second drive transistor
The threshold voltage settings of M2 are Vth1, drive crystal second at this point, obtaining light-emitting component OLED below by two examples
Pipe M2 works in driving current when different mode:
It is understood that driving light-emitting component OLED to be sent out by the 8th transistor Q8 in the second driving transistor M2
Light time, the driving current of light-emitting component OLED are the electric current flowed through between the drain electrode and source electrode of the second driving transistor M2.
Example three: when the second driving transistor M2 works in linear drive mode, and the first driving transistor M1's
Grid voltage Vg=Vdata- | Vth1 |, source voltage Vs=VDD, threshold voltage be Vth2 when, can be obtained by above-mentioned formula (1)
To the driving current of light-emitting component OLED are as follows:
Example four: when the second driving transistor M2 works in driven saturated mode, and the first driving transistor M1's
Grid voltage Vg=Vdata- | Vth1 |, source voltage Vs=VDD, threshold voltage be Vth2 when, can be obtained by above-mentioned formula (2)
To the driving current of light-emitting component OLED are as follows:
By above-mentioned example one and example three it is found that working in line in the first driving transistor M1 and the second driving transistor M2
When property drive mode, average driving current of the light-emitting component OLED in two periods (odd number refresh cycle and the even number refresh cycle)
Are as follows:
As it can be seen that when the first driving transistor M1 and the second driving transistor M2 work in linear drive mode, by double
Driving FTF is driven and is lighted simultaneously, and Vth1 is completely eliminated with Vth2.
By above-mentioned example two and example four it is found that being worked in the first driving transistor M1 and the second driving transistor M2 full
When with drive mode, average driving current of the light-emitting component OLED in two periods (odd number refresh cycle and the even number refresh cycle)
Are as follows:
According to the characteristics of p-type low-temperature polysilicon film transistor it is found that its threshold voltage value | Vth1 | with | Vth2 | it is small
In 1V, if | Vth1 | with | Vth2 | size is almost the same, and Vth1 and Vth2 are completely eliminated；It so shines if there is difference
The driving current I2 and I4 of element OLED is respectively as follows: As it can be seen that working in driven saturated mode in the first driving transistor M1 and the second driving transistor M2
When, it is driven and is lighted simultaneously by double drive FTF, can eliminate or reduce the influence of Vth.
In conclusion carrying out obtaining simultaneously by linear double drive FTF and lighting the shadow that threshold voltage vt h is completely eliminated
It rings, carries out obtaining and lighting driven saturated TFT simultaneously by saturation double drive FTF to eliminate or reducing the influence of Vth.As a result,
The pixel-driving circuit of the embodiment of the present invention carries out obtaining threshold value electricity using pair method of refresh cycle average driving currents
Light-emitting component is pressed and lighted, there is correctness and validity.
In an example of the invention, referring to Fig. 5, pixel-driving circuit 100 may also include initialization module 30.Initially
Change module 30 and initialize end Rst, reference voltage provides end Vref, first drives the control electrode of transistor M1, the second driving brilliant
The control electrode of body pipe M2 is connected with the anode of light-emitting component 10, and initialization module 30 is used for the initialization letter in initialization end Rst
Number control under, provide reference voltage that end Vref is provided to the control electrode of the first driving transistor M1, the according to reference voltage
The control electrode of two driving transistor M2 and the anode of light-emitting component OLED are initialized.
Further, referring to Fig. 5, initialization module 30 can include: the 9th transistor Q9 and the tenth transistor Q10.
Wherein, the control electrode and the second driving transistor M2 of the first pole of the 9th transistor Q9 and the first driving transistor M1
Control electrode be connected, the second pole of the 9th transistor Q9 is connected with reference voltage offer end Vref, the control of the 9th transistor Q9
Pole is connected with initialization end Rst；The first pole of tenth transistor Q10 is connected with the anode of light-emitting component 10, the tenth transistor Q10
The second pole and reference voltage end Vref be provided be connected, the control electrode of the tenth transistor Q10 is connected with end Rst is initialized.
It specifically, i.e., can be at initializing signal end within the t1 period as shown in fig. 6, when each refresh cycle starts
Rst applies initializing signal, so that the 9th transistor Q9 and the tenth transistor Q10 conducting, to be resetted.
Specifically, illustrating that the refresh process, t1 are initial by taking certain two refresh cycle during display as an example referring to Fig. 6
The conducting in change stage, the 9th transistor Q9 makes the voltage of Q point become Vref, for eliminating the previous frame data electricity of storage capacitance C1
The conducting of pressure, the tenth transistor Q10 carries out reversed initialization to prevent ghost, to improve hair to the anode of switch element OLED
The service life of optical element OLED；The t2 period (odd number refresh cycle) is to obtain threshold voltage and light the light-emitting component stage；t3
For the retention time of threshold voltage；The t4 period is similar with the t1 period, refreshes initial reset for second round；T5 period (even number brush
The new period) it is to obtain threshold voltage and light the light-emitting component stage；The t6 period is similar with the t1 period, refreshes for the period 3 initial
It resets.
In conclusion the pixel-driving circuit of the embodiment of the present invention, carries out threshold voltage compensation by double drive TFT simultaneously
Driving process can be simplified compared to the method for first obtaining threshold voltage and then lighting light-emitting component with lighting for light-emitting component,
The charge efficiency to storage capacitance is improved, refresh rate is improved, eliminates or reduce the influence because of threshold voltage to picture brightness unevenness；
And using the method for double refresh cycle average driving currents, high reliablity.
Further, the invention proposes a kind of display panel, Fig. 7 is the knot of display panel according to an embodiment of the present invention
Structure block diagram.
As shown in fig. 7, the display panel 1000 includes the pixel-driving circuit 100 of the above embodiment of the present invention.
The display panel of the embodiment of the present invention can pass through double drive using the pixel-driving circuit of the embodiment of the present invention
TFT carries out lighting for threshold voltage compensation and light-emitting component simultaneously, simplifies driving process, improves the charge efficiency of storage capacitance,
Refresh rate is improved, while eliminating or reducing influence of the threshold voltage to picture brightness unevenness.
Fig. 8 is the flow chart of the control method of pixel-driving circuit according to an embodiment of the present invention.
As shown in figure 8, the control method the following steps are included:
S1 controls the first driving transistor and the second driving transistor driven light-emitting component in pixel-driving circuit
It shines.
S2, when the first driving light emission drive transistor element, control the second driving transistor carries out threshold voltage compensation
S3, when the second driving light emission drive transistor element, control the first driving transistor carries out threshold voltage compensation.
It should be noted that the specific embodiment of the control method of the pixel-driving circuit of the embodiment of the present invention can be found in
The specific embodiment of the pixel-driving circuit of above-described embodiment when of the invention, details are not described herein again.
The control method of the pixel-driving circuit of the embodiment of the present invention can carry out simultaneously threshold value electricity by double drive TFT
Pressure compensation is lighted with light-emitting component, can be simplified driving process, be improved the charge efficiency of storage capacitance, improve refresh rate, together
When eliminate or reduce influence of the threshold voltage to picture brightness unevenness.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three
It is a etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the present invention unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with
It is that the first and second features directly contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below "
One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (10)
1. a kind of pixel-driving circuit characterized by comprising
Storage capacitance；
First driving transistor and the second driving transistor, the control electrode of the first driving transistor and second driving are brilliant
The control electrode of body pipe is connected, and is connected with the storage capacitance；
Light-emitting component；
Control module, the control module and the first driving transistor, the second driving transistor and the luminous member
Part is connected, and the control module alternately drives for controlling the first driving transistor with the second driving transistor
Work is shone with light-emitting component described in driven, and when the light-emitting component described in the first driving transistor driving, control
The second driving transistor carries out threshold voltage compensation, and, the light-emitting component described in the second driving transistor driving
When, it controls the first driving transistor and carries out threshold voltage compensation.
2. pixel-driving circuit according to claim 1, which is characterized in that the control module includes:
First control submodule, first control submodule and the first control terminal, the first driving transistor, described second
Driving transistor is connected with the light-emitting component, and first control submodule is used for according to the first of first control terminal the control
Signal processed controls the second driving transistor and carries out threshold voltage compensation, while controlling the first driving transistor and carrying out
Drive work；
Second control submodule, second control submodule and the second control terminal, the first driving transistor, described second
Driving transistor is connected with the light-emitting component, and second control submodule is used for according to the second of second control terminal the control
Signal processed controls the first driving transistor and carries out threshold voltage compensation, while controlling the second driving transistor and carrying out
Drive work.
3. pixel-driving circuit according to claim 2, which is characterized in that first control submodule includes:
First write-in compensating unit, the first write-in compensating unit and first control terminal, data terminal and described second drive
Dynamic transistor is connected, and the first write-in compensating unit is used for the first control signal according to first control terminal, controls institute
The write-in of the data voltage of data terminal is stated, and controls the second driving transistor and threshold voltage is carried out to the data voltage of write-in
Compensated data voltage is provided to the first driving transistor by compensation；
First drive control unit, first drive control unit and first control terminal, the first driving transistor
It is connected with the light-emitting component, first drive control unit is used for the first control signal according to first control terminal,
It controls the first driving transistor and carries out driving work, wherein the first driving of driving transistor is according to compensated number
The light-emitting component is driven to shine according to voltage.
4. pixel-driving circuit according to claim 2, which is characterized in that second control submodule includes:
Second write-in compensating unit, the second write-in compensating unit and second control terminal, data terminal and described first drive
Dynamic transistor is connected, and the second write-in compensating unit is used for the second control signal according to second control terminal, controls institute
The write-in of the data voltage of data terminal is stated, and controls the first driving transistor and threshold voltage is carried out to the data voltage of write-in
Compensated data voltage is provided to the second driving transistor by compensation；
Second drive control unit, second drive control unit and second control terminal, the second driving transistor
It is connected with the light-emitting component, second drive control unit is used for the second control signal according to second control terminal,
It controls the second driving transistor and carries out driving work, wherein the second driving of driving transistor is according to compensated number
The light-emitting component is driven to shine according to voltage.
5. pixel-driving circuit according to claim 3, which is characterized in that
The first write-in compensating unit includes the first transistor and second transistor, the first pole of the first transistor and institute
Data terminal to be stated to be connected, the second pole of the first transistor is extremely connected with the first of the second driving transistor, and described second
First pole of transistor second is extremely connected with the second driving transistor, the second pole of the second transistor and described the
Two driving transistors control electrode be connected, the control electrode of the control electrode of the first transistor and the second transistor with it is described
First control terminal is connected；
First drive control unit includes third transistor and the 4th transistor, the first pole of the third transistor and the
One power supply is connected with one end of storage capacitance, the first pole of the second pole of the third transistor and the first driving transistor
It is connected, the first pole of the 4th transistor is extremely connected with the second of the first driving transistor, the 4th transistor
Second pole is connected with the anode of the light-emitting component, the control electrode of the control electrode of the third transistor and the 4th transistor
It is connected with first control terminal, wherein the control electrode phase of the other end of the storage capacitance and the first driving transistor
Even.
6. pixel-driving circuit according to claim 4, which is characterized in that
The second write-in compensating unit includes the 5th transistor and the 6th transistor, the first pole of the 5th transistor and institute
Data terminal to be stated to be connected, the second pole of the 5th transistor is extremely connected with the first of the first driving transistor, and the described 6th
First pole of transistor second is extremely connected with the first driving transistor, the second pole of the 6th transistor and described the
The control electrode of one driving transistor is connected, the control electrode of the control electrode of the 5th transistor and the 6th transistor with it is described
Second control terminal is connected；
Second drive control unit includes the 7th transistor and the 8th transistor, the first pole of the 7th transistor and the
One power supply is connected with one end of storage capacitance, the first pole of the second pole of the 7th transistor and the second driving transistor
It is connected, the first pole of the 8th transistor is extremely connected with the second of the second driving transistor, the 8th transistor
Second pole is connected with the anode of the light-emitting component, the control electrode of the 7th transistor and the control electrode of the 8th transistor
It is connected with second control terminal, wherein the control electrode phase of the other end of the storage capacitance and the second driving transistor
Even.
7. pixel-driving circuit according to claim 1, which is characterized in that further include:
Initialization module, the initialization module and initialization end, reference voltage provide the control at end, the first driving transistor
Pole processed, the second driving transistor control electrode be connected with the anode of the light-emitting component, the initialization module for
Under the control of the initializing signal at the initialization end, reference voltage that end provides is provided to described the according to the reference voltage
The anode of the control electrode of one driving transistor, the control electrode of the second driving transistor and the light-emitting component carries out initial
Change.
8. pixel-driving circuit according to claim 7, which is characterized in that the initialization module includes:
The control electrode and described second of 9th transistor, the first pole of the 9th transistor and the first driving transistor is driven
The control electrode of dynamic transistor is connected, and the second pole of the 9th transistor provides end with the reference voltage and is connected, and the described 9th
The control electrode of transistor is connected with the initialization end；
First pole of the tenth transistor, the tenth transistor is connected with the anode of the light-emitting component, the tenth transistor
The second pole and the reference voltage end be provided be connected, the control electrode of the tenth transistor is connected with the initialization end.
9. a kind of display panel, which is characterized in that including pixel-driving circuit according to claim 1 to 8.
10. a kind of control method of pixel-driving circuit, which comprises the following steps:
Control the first driving transistor and the second driving transistor driven light-emitting component hair in the pixel-driving circuit
Light；
When described first drives light-emitting component described in transistor driving, controls the second driving transistor and carry out threshold voltage
Compensation；And
When described second drives light-emitting component described in transistor driving, controls the first driving transistor and carry out threshold voltage
Compensation.
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