CN106683619A - Pixel driving circuit, pixel driving method and display device - Google Patents
Pixel driving circuit, pixel driving method and display device Download PDFInfo
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- CN106683619A CN106683619A CN201710192369.0A CN201710192369A CN106683619A CN 106683619 A CN106683619 A CN 106683619A CN 201710192369 A CN201710192369 A CN 201710192369A CN 106683619 A CN106683619 A CN 106683619A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
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- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention discloses a pixel driving circuit, a pixel driving method and a display device. The pixel driving circuit comprises a driving transistor, a light-emitting device and a threshold value compensation unit, the control electrode, the first electrode and the second electrode of the driving transistor are connected with the threshold value compensation unit, the threshold value compensation unit is connected with a data line, a first power source end and a first end of the light-emitting device and is used for writing control voltage into the control electrode of the driving transistor when the driving transistor drives the light-emitting device to display pixels, and the control voltage is equal to the sum of the threshold value voltage of the driving transistor and data voltage in the data line. By means of the technical scheme, the threshold value compensation unit writes control voltage into the control electrode of the driving transistor, wherein the control voltage is equal to the sum of the data voltage and the threshold value voltage of the driving transistor, so that driving currents generated by the driving transistor are unrelated to the threshold value voltage of the driving transistor, and it is effectively avoided that the driving currents generated by the driving transistor are affected by unevenness and shift of the threshold value voltage.
Description
Technical field
The present invention relates to display technology field, more particularly to a kind of pixel-driving circuit, image element driving method and display dress
Put.
Background technology
Active matrix organic LED panel (Active Matrix Organic Light Emitting
Diode, referred to as：AMOLED application) is more and more extensive.The pixel display device of AMOLED is Organic Light Emitting Diode
(Organic Light-Emitting Diode, abbreviation OLED), AMOLED can light to be existed by driving thin film transistor (TFT)
Driving current is produced under saturation, the driving current drives OLED to light.
Fig. 1 is the structural representation of basic pixel-driving circuit in prior art, as shown in figure 1, existing basic
Pixel-driving circuit adopts 2T1C circuits, the 2T1C circuits to include two thin film transistor (TFT)s (switch transistor T 0 and driving transistors
) and 1 storage capacitance C DTFT.Due in existing low temperature polysilicon process processing procedure, each driving transistor on display base plate
Threshold voltage vt h uniformities between DTFT are poor, and also occur that drift in use, so when grid line Gate is controlled
When switch transistor T processed 0 is turned on to be input into identical data voltage Vdata to each driving transistor DTFT, due to each driving tube DTFT's
Threshold voltage is different to produce different driving currents, so as to cause the uniformity of OLED brightness poor.
The content of the invention
It is contemplated that at least solving one of technical problem present in prior art, it is proposed that a kind of pixel driver electricity
Road, image element driving method and display device.
For achieving the above object, the invention provides a kind of pixel-driving circuit, including：Driving transistor, luminescent device
And threshold compensation unit；
The control pole of the driving transistor, the first pole and second are extremely connected with the threshold compensation unit；
The threshold compensation unit is connected with the first end of data wire, the first power end and luminescent device；
Second end of the luminescent device is connected with second source end；
The driving transistor carries out pixel and shows for driven for emitting lights device；
The threshold compensation unit is used for when the driving transistor driven for emitting lights device carries out pixel display, will control
Voltage is write to the control pole of the driving transistor, and the control voltage is equal to the threshold voltage of the driving transistor and institute
State the data voltage sum in data wire.
Alternatively, the threshold compensation unit includes：Storage capacitance, the first reseting module, charging module and light emitting control
Module；
First reseting module is connected with the second end of the storage capacitance；
The charging module and the data wire, the first pole of the driving transistor, the second of the driving transistor
The second end connection of pole and the storage capacitance；
The light emitting control module and first power end, the first pole of the driving transistor, the driving crystal
Second pole of pipe and the first end connection of the luminescent device；
The first end of the storage capacitance is connected with first power end, the second end and the drive of the storage capacitance
The control pole connection of dynamic transistor；
First reseting module is used to reset the second end of the storage capacitance；
The charging module is used for after the second end of the storage capacitance completes to reset, by the of the storage capacitance
The voltage at two ends charges to the control voltage；
The light emitting control module is used for when the driving transistor driven for emitting lights device carries out pixel display, will be described
First pole of the first power end and the driving transistor turns on, and by the second pole of the driving tube and the luminescent device
First end conducting.
Alternatively, first reseting module includes：First switch pipe；
The control pole of the first switch pipe is connected with the first signal control line, the first pole of the first switch pipe and the
One signal input line, the second pole of the first switch pipe is connected with the control pole of the driving transistor, first signal
Input line is grid line；
And/or, the charging module includes：Second switch pipe and the 3rd switching tube；
The control pole of the second switch pipe is connected with grid line, the first pole of the second switch pipe and the driving crystal
The second pole connection of pipe, the second pole of the second switch pipe is connected with the control pole of the driving transistor；
The control pole of the 3rd switching tube is connected with the grid line, the first pole of the 3rd switching tube and the data
Line connects, and second pole of the 3rd switching tube is connected with the first pole of the driving transistor；
And/or, the luminous controling unit includes：4th switching tube and the 5th switching tube；
The control pole of the 4th switching tube is connected with secondary signal control line, the first pole of the 4th switching tube and institute
The connection of the first power end is stated, second pole of the 4th switching tube is connected with the first pole of the driving transistor；
The control pole of the 5th switching tube is connected with the secondary signal control line, the first pole of the 5th switching tube
It is connected with the second pole of the driving transistor, the second pole of the 5th switching tube connects with the first end of the luminescent device
Connect.
Alternatively, also include：Second reseting module, second reseting module connects with the first end of the luminescent device
Connect；
Second reseting module is used to reset the first end of the luminescent device.
Alternatively, second reseting module includes：6th switching tube；
The control pole of the 6th switching tube is connected with the first signal control line, the first pole of the 6th switching tube and the
Binary signal input line connects, and the second pole of the 6th switching tube is connected with the first end of the luminescent device.
Alternatively, the secondary signal input line and first signal control line are same signal lead.
Alternatively, also include：Electric current removes module, and the electric current removes module and connects with the control pole of the driving transistor
Connect；
The electric current removes module to be used to remove the aftercurrent in the driving transistor.
Alternatively, the electric current removes module and includes：7th switching tube；
The control pole of the 7th switching tube is connected with the 3rd signal control line, the first pole of the 7th switching tube and the
One power end connects, and the second pole of the 7th switching tube is connected with the control pole in the driving transistor.
For achieving the above object, present invention also offers a kind of display device, including：Pixel-driving circuit described above.
For achieving the above object, present invention also offers a kind of image element driving method, the image element driving method is based on picture
Plain drive circuit, the pixel-driving circuit adopts above-mentioned pixel-driving circuit, the image element driving method to include：
The threshold compensation unit exports control voltage to the control pole of the driving transistor, the control voltage etc.
Data voltage sum in the threshold voltage and data wire of the driving transistor, the driving transistor is in the control electricity
Driven for emitting lights device carries out pixel and shows under the control of pressure.
The invention has the advantages that：
The invention provides a kind of pixel-driving circuit, image element driving method and display device, drive in driving transistor
When luminescent device carries out pixel display, size is equal to by threshold compensation unit for the threshold value electricity of data voltage and driving transistor
The control voltage of pressure sum is write to the control pole of driving transistor, so that the driving current produced by driving transistor and drive
The threshold voltage of dynamic transistor is unrelated, that is, the driving current that effectively prevent driving transistor generation is subject to threshold voltage uneven
With drift impact, so as to effectively lift the brightness uniformity of each luminescent device in display device.
Description of the drawings
Fig. 1 is the structural representation of pixel-driving circuit basic in prior art；
Fig. 2 is a kind of circuit diagram of pixel-driving circuit that the embodiment of the present invention one is provided；
Fig. 3 is a kind of circuit diagram of pixel-driving circuit that the embodiment of the present invention two is provided；
Fig. 4 is the working timing figure of the pixel-driving circuit shown in Fig. 3；
Fig. 5 is a kind of circuit diagram figure of pixel-driving circuit that the embodiment of the present invention three is provided；
Fig. 6 is the working timing figure of the pixel-driving circuit shown in Fig. 5.
Specific embodiment
To make those skilled in the art more fully understand technical scheme, the present invention is carried below in conjunction with the accompanying drawings
For pixel-driving circuit, image element driving method and display device be described in detail.
Embodiment one
Fig. 2 is a kind of circuit diagram of pixel-driving circuit that the embodiment of the present invention one is provided, as described in Figure 2, the picture
Plain drive circuit includes：Driving transistor DTFT, luminescent device OLED and threshold compensation unit, wherein, driving transistor DTFT
Control pole, the first pole and second be extremely connected with threshold compensation unit, threshold compensation unit and data wire Data, the first power supply
The first end of end and luminescent device OLED connects, and second end of luminescent device OLED is connected with second source end.Driving transistor
DTFT carries out pixel and shows for driven for emitting lights device OLED；Threshold compensation unit is used in driving transistor DTFT driven for emitting lights
When device OLED carries out pixel display, control voltage is write to the control pole of driving transistor DTFT, control voltage is equal to drives
Data voltage sum in the threshold voltage and data wire Data of dynamic transistor DTFT.
In the present invention, the luminescent device is the luminescent device of current drive-type, for example, light emitting diode (Light
Emitting Diode, abbreviation LED), OLED.Illustrate so that luminescent device is as OLED as an example in the present embodiment.
Additionally, the first power end in the present embodiment is used to provide high level voltage, second source end is used to provide low electricity
Ordinary telegram pressure.
Technical scheme, will by carrying out in luminescence process in driving transistor DTFT driven for emitting lights device OLED
The control voltage of the data voltage sum that size is equal in threshold voltage and the data wire Data of driving transistor DTFT write to
The control pole of driving transistor DTFT, so that the driving current produced by driving transistor DTFT and driving transistor DTFT
Threshold voltage is unrelated, so as to eliminate the impact of driving current of the threshold voltage of driving transistor DTFT to generating, Jin Eryou
Effect lifts the brightness uniformity of each luminescent device OLED in display device.
In the present embodiment, specifically, the threshold compensation unit includes：Storage capacitance C1, the first reseting module 1, charging
Module 2 and light emitting control module 3, wherein, the first reseting module 1 is connected with the second end of storage capacitance C1, charging module 2 with number
Connect according to the second end of line Data, the first pole of driving transistor DTFT, the second pole of driving transistor DTFT and storage capacitance C1
Connect, the power end of light emitting control module 3 and first, the first pole of driving transistor DTFT, the second pole of driving transistor DTFT and
The first end connection of luminescent device OLED, the first end of storage capacitance C1 is connected with the first power end, and the second of storage capacitance C1
End is connected with the control pole of driving transistor DTFT.First reseting module 1 is used to reset the second end of storage capacitance C1；
Charging module 2 is used for after the second end of storage capacitance C1 completes to reset, and the voltage at the second end of storage capacitance C1 is charged
To control voltage；Light emitting control module 3 is used for when driving transistor DTFT driven for emitting lights device OLED carries out pixel display, will
First pole of the first power end and driving transistor DTFT turns on, and by the of the second pole of driving tube and luminescent device OLED
One end turns on.
It should be noted that the first power end in the present invention shows for carrying out pixel in driven for emitting lights device OLED
When provide running voltage and maintain storage capacitance C1 first end voltage be in a fixed value.Second source end is used to provide
Ground voltage.
It is capable of achieving control voltage by storage capacitance C1, the first reseting module 1, charging module 2 and light emitting control module 3
Write to the control pole of driving transistor DTFT.
The embodiment of the present invention one provides a kind of pixel-driving circuit, and in driving transistor driven for emitting lights device pixel is carried out
During display, size is equal to by threshold compensation unit for the control voltage of data voltage and the threshold voltage sum of driving transistor
Write to the control pole of driving transistor, so that the driving current produced by driving transistor is electric with the threshold value of driving transistor
Pressure is unrelated, that is, the driving current that effectively prevent driving transistor generation is subject to that threshold voltage is uneven to be affected with drift, from
And effectively lift the brightness uniformity of each luminescent device in display device.
Embodiment two
Fig. 3 is a kind of circuit diagram of pixel-driving circuit that the embodiment of the present invention two is provided, as shown in figure 3, the picture
Element is driven to based on the materialization of pixel-driving circuit shown in Fig. 2, wherein, alternatively, the first reseting module 1 includes：First opens
Pipe T1 is closed, the control pole of first switch pipe T1 is connected with the first signal control line Scan1, first pole of first switch pipe T1 and the
One signal input line Input1, second pole of first switch pipe T1 is connected with the control pole of driving transistor DTFT.
Alternatively, charging module 2 includes：Second switch pipe T2 and the 3rd switch transistor T 3；The control pole of second switch pipe T2
It is connected with grid line Gate, first pole of second switch pipe T2 is connected with the second pole of driving transistor DTFT, second switch pipe T2
The second pole be connected with the control pole of driving transistor DTFT；The control pole of the 3rd switch transistor T 3 is connected with grid line Gate, and the 3rd
First pole of switch transistor T 3 is connected with data wire Data, the second pole of the 3rd switch transistor T 3 and the first pole of driving transistor DTFT
Connection.
Alternatively, luminous controling unit includes：4th switch transistor T 4 and the 5th switch transistor T 5；The control of the 4th switch transistor T 4
Pole is connected with secondary signal control line Scan2, and the first pole of the 4th switch transistor T 4 is connected with the first power end, the 4th switch transistor T 4
The second pole be connected with the first pole of driving transistor DTFT；The control pole of the 5th switch transistor T 5 and secondary signal control line
Scan2 connects, and the first pole of the 5th switch transistor T 5 is connected with the second pole of driving transistor DTFT, and the second of the 5th switch transistor T 5
Pole is connected with the first end of luminescent device OLED.
Preferably, the first signal input line Input1 is grid line Gate, now without the need for additionally setting in pixel-driving circuit
Put the first signal input line Input1 and corresponding input signal, so as to effectively reduce in pixel-driving circuit holding wire and
The species of signal, reduces the demand to control signal chip.
Alternatively, the pixel-driving circuit also includes：Second reseting module 4, the second reseting module 4 and luminescent device OLED
First end connection；Second reseting module 4 is used to reset the first end of luminescent device OLED.Still optionally further,
Two reseting modules 4 include：6th switch transistor T 6, the control pole of the 6th switch transistor T 6 is connected with the first signal control line Scan1, the
First pole of six switch transistor Ts 6 is connected with secondary signal input line Input2, the second pole of the 6th switch transistor T 6 and luminescent device
The first end connection of OLED.
Preferably, the connection of secondary signal input line Input2 and the first signal control line Scan1 are same signal lead.
Now, secondary signal input line Input2 and corresponding input signal are set without the need for extra in pixel-driving circuit, so as to have
The species for reducing holding wire and signal in pixel-driving circuit of effect, reduces the demand to control signal chip.
In the present embodiment, in the present embodiment driving transistor DTFT, first switch pipe T1, second switch pipe T2,
3rd switch transistor T 3, the 4th switch transistor T 4, the 5th switch transistor T 5, the 6th switch transistor T 6 are respectively and independently selected from polysilicon membrane crystal
One kind in pipe, amorphous silicon film transistor, oxide thin film transistor and OTFT.Relate in the present embodiment
And to " control pole " specifically refer to the grid of transistor, one of " the first pole " and " the second pole " refer to the source of transistor
Pole, another one refers to the drain electrode of transistor.
In the present embodiment, it is preferable that all transistors in pixel-driving circuit are P-type TFT, now may be used
The identical preparation technology for adopting with while prepare above-mentioned transistor, so as to the production cycle of pixel-driving circuit can be shortened.
It should be noted that all transistors in above-mentioned pixel-driving circuit are the situation of P-type TFT, only
For a kind of preferred version of the present embodiment, this can't produce restriction to the technical scheme of the application.
Below in conjunction with accompanying drawing, with pixel-driving circuit in all transistors be P-type TFT, the first signal
It is same letter that input line Input1 is grid line Gate, the connection of secondary signal input line Input2 and the first signal control line Scan1
In case of number cabling, the course of work of the pixel-driving circuit provided the present embodiment is described in detail.
Wherein, the first power end provides running voltage Vdd, and second source end is used to provide ground voltage Vss, grid line Gate
Voltage corresponding to the high level signal of middle input is Vgate_H, the electricity corresponding to low level signal being input in grid line Gate
Press as Vgate_L, data voltage Vdata is provided in data wire Data, the threshold voltage of driving transistor DTFT is Vth.
Fig. 4 is the working timing figure of the pixel-driving circuit shown in Fig. 3, as shown in figure 4, the work of the pixel-driving circuit
Process includes four-stage：First stage~fourth stage, first stage~fourth stage one drive cycle of correspondence.
First stage, the first signal control line Scan1 input low level signals, secondary signal control line Scan2 inputs are high
Level signal, grid line Gate input high level signals.Now, first switch pipe T1 and the 6th switch transistor T 6 are both turned on, and second opens
Close pipe T2, the 3rd switch transistor T 3, the 4th switch transistor T 4 and the 5th switch transistor T 5 to be turned off.
Due to first switch pipe T1 conductings, the then high level signal that the first signal input line Input1 (grid line Gate) is input into
Write by first switch pipe T1 to the second end of storage capacitance C1, resetted with the second end to storage capacitance C1, while
Also the reset of the control pole to driving transistor DTFT is completed, now the voltage at primary nodal point N1 is Vgate_H.
Because the 6th switching tube is turned on, then secondary signal input line Input2 (the first signal control line Scan1) is input into
Low level signal is write to the first end of luminescent device OLED, to reset to the first end to luminescent device OLED.
Second stage, the first signal control line Scan1 input low level signals, secondary signal control line Scan2 inputs are high
Level signal, grid line Gate input low level signals.Now, first switch pipe T1, second switch pipe T2, the and of the 3rd switch transistor T 3
6th switch transistor T 6 is both turned on, and the 4th switch transistor T 4 and the 5th switch transistor T 5 are turned off.
Because the 3rd switch transistor T 3 is turned on, then the data voltage in data wire Data is write to by the 3rd switch transistor T 3
Two node N2, the voltage at secondary nodal point N2 is Vdata.Again due to first switch pipe T1 conductings, and the letter of grid line Gate inputs
Number it is changed into low level signal, then the voltage now at primary nodal point N1 is changed into Vgate_L.At the same time, second switch pipe T2 leads
Logical, then primary nodal point N1 is charged by second switch pipe T2 to the 3rd node N3, and the voltage at the 3rd node N3 is
Vgate_L。
It should be noted that the voltage (i.e. voltage at primary nodal point N1) of the control pole due to driving transistor DTFT is
Low level voltage (size is equal to Vgate_L), then driving transistor DTFT conducting, and output has corresponding electric current.However, due to
5th switch transistor T 5 is ended, then without going past luminescent device OLED, luminescent device OLED's electric current does not light.
Phase III, the first signal control line Scan1 input high level signals, secondary signal control line Scan2 inputs are high
Level signal, grid line Gate input low level signals.Now, second switch pipe T2 and the 3rd switch transistor T 3 are both turned on, and first opens
Close pipe T1, the 4th switch transistor T 4, the 5th switch transistor T 5 and the 6th switch transistor T 6 to be turned off.
Because the 3rd switch transistor T 3 is turned on, then voltage is maintained Vdata at secondary nodal point N2.Again due to driving transistor
DTFT is both turned on, then secondary nodal point N2 is charged by driving transistor DTFT to the 3rd node N3, the electricity of the 3rd node N3
Pressure is gradually increasing, and at the same time, due to second switch pipe T2 conductings, then the voltage of primary nodal point N1 is with the electricity of the 3rd node N3
Pressure is synchronous to be risen, until the voltage at primary nodal point N1 rises to Vdata+Vth, i.e. control voltage, now, driving transistor
The gate source voltage Vgs of DTFT is Vth, and driving transistor DTFT cut-off, charging terminates.
Fourth stage, the first signal control line Scan1 input high level signals, secondary signal control line Scan2 inputs are low
Level signal, grid line Gate input high level signals.Now, the 4th switch transistor T 4 and the 5th switch transistor T 5 are both turned on, and first opens
Close pipe T1, second switch pipe T2, the 3rd switch transistor T 3 and the 6th switch transistor T 6 to be turned off.
Due to the conducting of the 4th switch transistor T 4T4, then running voltage Vdd that the first power end is provided passes through the 4th switching tube
T4T4 is write to secondary nodal point N2, and the voltage at secondary nodal point N2 is Vdd, and the gate source voltage Vgs of driving transistor DTFT is equal to
Vdata+Vth-Vdd, because data voltage Vdata is less than running voltage Vdd, then Vdata+Vth-Vdd is certainly less than Vth,
That is the gate source voltage Vgs of driving transistor DTFT is less than threshold voltage, and now driving transistor DTFT is turned on again.According to driving
The saturation drive current formula of transistor DTFT can be obtained：
I=K* (Vgs-Vth)2
=K* (Vdata+Vth-Vdd-Vth)2
=K* (Vdata-Vdd)2
Wherein, K (is determined) by a constant by the attribute of driving transistor DTFT.By above formula, crystal is driven
The driving current of pipe DTFT is related to running voltage Vdd and data voltage Vdata that the first power end is provided, and with drive crystal
The threshold voltage of pipe DTFT is unrelated.
In the pixel-driving circuit that the present embodiment two is provided, carry out pixel in driving transistor driven for emitting lights device and show
When, because the driving current of driving transistor and the threshold voltage of driving transistor are unrelated, thus can avoid flowing through luminescent device
Driving current it is uneven by threshold voltage and drift is affected, so as to effectively raise display device in flow through it is each luminous
The uniformity of the driving current of device.
Embodiment three
Fig. 5 be the embodiment of the present invention three provide a kind of pixel-driving circuit circuit diagram, as shown in figure 5, with it is upper
State unlike the pixel-driving circuit of the offer of embodiment two, the pixel-driving circuit that the present embodiment is provided also includes：Electric current goes
Except module 5, electric current removes module 5 and is connected with the control pole of driving transistor DTFT；Electric current removes module 5 to be used to remove driving crystalline substance
Aftercurrent in body pipe DTFT.
It is well known by those skilled in the art that in pixel-driving circuit driven for emitting lights device OLED luminescence process, front
After one drive cycle terminates, can there is aftercurrent in driving transistor DTFT, the aftercurrent can cause to drive week current
Interim driving transistor DTFT produces hysteresis effect, i.e. driving transistor DTFT response speed is slack-off.Now, image retention etc. can be caused
Display problem, reduces the quality of display picture.
To solve above-mentioned technical problem, in the present embodiment module 5 is removed by arranging electric current in pixel-driving circuit,
To remove the aftercurrent in driving transistor DTFT after previous drive cycle terminates, so as to effectively lift driving transistor
Response speeds of the DTFT in present drive period, and then image retention appearance can be prevented effectively from, improve the quality of display picture.
Alternatively, electric current removes module 5 and includes：7th switch transistor T 7；The control pole of the 7th switch transistor T 7 and the 3rd signal
Control line Scan3 connects, and the first pole of the 7th switch transistor T 1 is connected with the first power end, the second pole and the drive of the 7th switch transistor T 1
Control pole connection in dynamic transistor DTFT.
Below in conjunction with accompanying drawing, so that all transistors in pixel-driving circuit are P-type TFT situation as an example,
The course of work of the pixel-driving circuit provided the present embodiment is described in detail.
Wherein, the first power end provides running voltage Vdd, and second source end is used to provide ground voltage Vss, data wire
There is provided data voltage Vdata in Data, the threshold voltage of driving transistor DTFT is Vth, the first signal input line Input1 and
Secondary signal input line Input2 has been input into initial voltage signal (low level signal), initial voltage signal be constant voltage signal and
Corresponding voltage is Vinit.
Fig. 6 is the working timing figure of the pixel-driving circuit shown in Fig. 5, as shown in fig. 6, the work of the pixel-driving circuit
Process includes four-stage：First stage~fourth stage, first stage~fourth stage one drive cycle of correspondence.
First stage, the first signal control line Scan1 input high level signals, secondary signal control line Scan2 inputs are low
Level signal, the 3rd signal control line Scan3 input low level signals, grid line Gate input high level signals.Now, the 4th open
Close pipe T4, the 5th switch transistor T 5 and the 7th switching tube to be both turned on, first switch pipe T1, second switch pipe T2, the 3rd switch transistor T 3
It is turned off with the 6th switch transistor T 6.
Because the 7th switch transistor T 7 is turned on, then running voltage Vdd that the first power end is provided is write by the 7th switch transistor T 7
Enter to primary nodal point N1, the voltage at secondary nodal point N1 is Vdd, driving transistor DTFT is ended.
In this stage, residuing in the aftercurrent in driving transistor DTFT after a upper drive cycle terminates can pass through
7th switching tube is released, so as to response speed of driving transistor DTFT in present drive period is effectively ensured.
Second stage, the first signal control line Scan1 input low level signals, secondary signal control line Scan2 inputs are high
Level signal, the 3rd signal control line Scan3 input high level signals, grid line Gate input high level signals.Now, first open
Close pipe T1 and the 6th switch transistor T 6 is both turned on, second switch pipe T2, the 3rd switch transistor T 3, the 4th switch transistor T 4, the 5th switching tube
T5 and the 7th switch transistor T 7 are turned off.
Due to first switch pipe T1 conductings, then the initial voltage signal of the first signal input line Input1 inputs is by first
Switch transistor T 1 is write to the second end of storage capacitance C1, is resetted with the second end to storage capacitance C1, while also completing right
The reset of the control pole of driving transistor DTFT, now the voltage at primary nodal point N1 is Vinit.
Due to the conducting of the 6th switching tube, then the initial voltage signal of secondary signal input line Input2 input is write to luminous
The first end of device OLED, to reset to the first end to luminescent device OLED.
Phase III, the first signal control line Scan1 input high level signals, secondary signal control line Scan2 inputs are high
Level signal, the 3rd signal control line Scan3 input high level signals, grid line Gate input low level signals.Now, second open
Close pipe T2 and the 3rd switch transistor T 3 is both turned on, first switch pipe T1, the 4th switch transistor T 4, the 5th switch transistor T 5 and the 6th switching tube
T6 is turned off.
Because the 3rd switch transistor T 3 is turned on, then the data voltage in data wire Data is write to by the 3rd switch transistor T 3
Two node N2, the voltage at secondary nodal point N2 is Vdata.Again due to transistor seconds conducting, then primary nodal point N1 and the 3rd section
Voltage at point N3 is Vinit.
Because the voltage (i.e. voltage at primary nodal point N1) of the control pole of driving transistor DTFT is that low level voltage is (big
It is little equal to Vinit), then driving transistor DTFT conducting, secondary nodal point N2 entered by driving transistor DTFT to the 3rd node N3
Row charges, and the voltage of the 3rd node N3 is gradually increasing.At the same time, the voltage of primary nodal point N1 is with the voltage of the 3rd node N3
It is synchronous to rise, until the voltage at primary nodal point N1 rises to Vdata+Vth, i.e. control voltage, now, driving transistor DTFT
Gate source voltage Vgs be equal to Vth, the cut-off of driving transistor DTFT, charging terminates.
It should be noted that, although output has corresponding electric current when driving transistor DTFT is in the conduction state, but
Because the 5th switch transistor T 5 is ended, then without going past luminescent device OLED, luminescent device OLED's electric current does not light.
Fourth stage, the first signal control line Scan1 input high level signals, secondary signal control line Scan2 inputs are low
Level signal, the 3rd signal control line Scan3 input high level signals, grid line Gate input high level signals.Now, the 4th open
Close pipe T4 and the 5th switch transistor T 5 is both turned on, first switch pipe T1, second switch pipe T2, the 3rd switch transistor T 3, the 6th switching tube
T6 and the 7th switch transistor T 7 are turned off.
Due to the conducting of the 4th switch transistor T 4T4, then running voltage Vdd that the first power end is provided passes through the 4th switching tube
T4T4 is write to secondary nodal point N2, and the voltage at secondary nodal point N2 is Vdd, and the gate source voltage Vgs of driving transistor DTFT is equal to
Vdata+Vth-Vdd, because data voltage Vdata is less than running voltage Vdd, then Vdata+Vth-Vdd is certainly less than Vth, i.e.,
The gate source voltage Vgs of driving transistor DTFT is less than threshold voltage, and now driving transistor DTFT is turned on again.It is brilliant according to driving
The saturation drive current formula of body pipe DTFT can be obtained：
I=K* (Vgs-Vth)2
=K* (Vdata+Vth-Vdd-Vth)2
=K* (Vdata-Vdd)2
Wherein, K (is determined) by a constant by the attribute of driving transistor DTFT.By above formula, crystal is driven
The driving current of pipe DTFT is related to running voltage Vdd and data voltage Vdata that the first power end is provided, and with drive crystal
The threshold voltage of pipe DTFT is unrelated.
In the pixel-driving circuit that the present embodiment three is provided, carry out pixel in driving transistor driven for emitting lights device and show
When, because the driving current of driving transistor and the threshold voltage of driving transistor are unrelated, thus can avoid flowing through luminescent device
Driving current it is uneven by threshold voltage and drift is affected, so as to effectively raise display device in flow through it is each luminous
The uniformity of the driving current of device.Additionally, electric current removes the setting of module, can effectively lift driving transistor and drive currently
Response speed in cycle, and then image retention appearance can be prevented effectively from, improve the quality of display picture.
Example IV
A kind of image element driving method that the embodiment of the present invention four is provided, the image element driving method is based on pixel-driving circuit,
The pixel-driving circuit adopts the pixel-driving circuit of arbitrary offer in one~embodiment of above-described embodiment three, the pixel driver side
Method includes：
Step S1, threshold compensation unit export control voltage to the control pole of driving transistor, and control voltage is equal to drives
Data voltage sum in the threshold voltage and data wire of dynamic transistor, driving transistor drives under control of a control voltage to be sent out
Optical device carries out pixel and shows.
For the specific descriptions of step S1 can be found in previous embodiment one to the corresponding contents in embodiment three, herein no longer
Repeat.
Embodiment five
The embodiment of the present invention five provides a kind of display device, and the display device includes：Pixel-driving circuit, the pixel is driven
Galvanic electricity road is specifically described and can be found in above-mentioned reality using the pixel-driving circuit of arbitrary offer in one~embodiment of above-described embodiment three
The content in one~embodiment of example three is applied, here is omitted.
It is understood that the embodiment of above principle being intended to be merely illustrative of the present and the exemplary enforcement for adopting
Mode, but the invention is not limited in this.For those skilled in the art, in the essence without departing from the present invention
In the case of god and essence, various modifications and improvement can be made, these modifications and improvement are also considered as protection scope of the present invention.
Claims (10)
1. a kind of pixel-driving circuit, it is characterised in that include：Driving transistor, luminescent device and threshold compensation unit；
The control pole of the driving transistor, the first pole and second are extremely connected with the threshold compensation unit；
The threshold compensation unit is connected with the first end of data wire, the first power end and luminescent device；
Second end of the luminescent device is connected with second source end；
The driving transistor carries out pixel and shows for driven for emitting lights device；
The threshold compensation unit is used for when the driving transistor driven for emitting lights device carries out pixel display, by control voltage
Write to the control pole of the driving transistor, the control voltage is equal to the threshold voltage and the number of the driving transistor
According to the data voltage sum in line.
2. pixel-driving circuit according to claim 1, it is characterised in that the threshold compensation unit includes：Storage electricity
Appearance, the first reseting module, charging module and light emitting control module；
First reseting module is connected with the second end of the storage capacitance；
The charging module and the data wire, the first pole of the driving transistor, the second pole of the driving transistor and
The second end connection of the storage capacitance；
The light emitting control module and first power end, the first pole of the driving transistor, the driving transistor
The first end connection of the second pole and the luminescent device；
The first end of the storage capacitance is connected with first power end, and the second end of the storage capacitance drives crystalline substance with described
The control pole connection of body pipe；
First reseting module is used to reset the second end of the storage capacitance；
The charging module is used for after the second end of the storage capacitance completes to reset, by the second end of the storage capacitance
Voltage charge to the control voltage；
The light emitting control module is used for when the driving transistor driven for emitting lights device carries out pixel display, by described first
First pole of power end and the driving transistor turns on, and by the of the second pole of the driving tube and the luminescent device
One end turns on.
3. pixel-driving circuit according to claim 2, it is characterised in that
First reseting module includes：First switch pipe；
The control pole of the first switch pipe is connected with the first signal control line, and the first pole of the first switch pipe is believed with first
Number input line, the second pole of the first switch pipe is connected with the control pole of the driving transistor, first signal input
Line is grid line；
And/or, the charging module includes：Second switch pipe and the 3rd switching tube；
The control pole of the second switch pipe is connected with grid line, the first pole and the driving transistor of the second switch pipe
Second pole connects, and the second pole of the second switch pipe is connected with the control pole of the driving transistor；
The control pole of the 3rd switching tube is connected with the grid line, and the first pole of the 3rd switching tube connects with the data wire
Connect, second pole of the 3rd switching tube is connected with the first pole of the driving transistor；
And/or, the luminous controling unit includes：4th switching tube and the 5th switching tube；
The control pole of the 4th switching tube is connected with secondary signal control line, the first pole of the 4th switching tube and described
One power end connects, and second pole of the 4th switching tube is connected with the first pole of the driving transistor；
The control pole of the 5th switching tube is connected with the secondary signal control line, the first pole of the 5th switching tube and institute
The second pole connection of driving transistor is stated, the second pole of the 5th switching tube is connected with the first end of the luminescent device.
4. pixel-driving circuit according to claim 1, it is characterised in that also include：Second reseting module, described second
Reseting module is connected with the first end of the luminescent device；
Second reseting module is used to reset the first end of the luminescent device.
5. pixel-driving circuit according to claim 4, it is characterised in that second reseting module includes：6th opens
Guan Guan；
The control pole of the 6th switching tube is connected with the first signal control line, and the first pole of the 6th switching tube is believed with second
The connection of number input line, the second pole of the 6th switching tube is connected with the first end of the luminescent device.
6. pixel-driving circuit according to claim 5, it is characterised in that the secondary signal input line and described first
Signal control line is same signal lead.
7. the pixel-driving circuit according to right 1, it is characterised in that also include：Electric current removes module, and the electric current is removed
Module is connected with the control pole of the driving transistor；
The electric current removes module to be used to remove the aftercurrent in the driving transistor.
8. pixel-driving circuit according to claim 7, it is characterised in that the electric current removes module to be included：7th opens
Guan Guan；
The control pole of the 7th switching tube is connected with the 3rd signal control line, and the first pole of the 7th switching tube is electric with first
Source connects, and the second pole of the 7th switching tube is connected with the control pole in the driving transistor.
9. a kind of display device, it is characterised in that include：Pixel-driving circuit as described in arbitrary in above-mentioned claim 1-8.
10. a kind of image element driving method, it is characterised in that the image element driving method is based on pixel-driving circuit, the pixel
Drive circuit is included using arbitrary described pixel-driving circuit in the claims 1-8, the image element driving method：
The threshold compensation unit exports control voltage to the control pole of the driving transistor, and the control voltage is equal to institute
The data voltage sum in the threshold voltage and data wire of driving transistor is stated, the driving transistor is in the control voltage
The lower driven for emitting lights device of control carries out pixel and shows.
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| CN201710192369.0A CN106683619A (en) | 2017-03-28 | 2017-03-28 | Pixel driving circuit, pixel driving method and display device |
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|---|---|---|---|
| CN201710192369.0A CN106683619A (en) | 2017-03-28 | 2017-03-28 | Pixel driving circuit, pixel driving method and display device |
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