CN109036285A - A kind of pixel-driving circuit and display device - Google Patents
A kind of pixel-driving circuit and display device Download PDFInfo
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- CN109036285A CN109036285A CN201810630290.6A CN201810630290A CN109036285A CN 109036285 A CN109036285 A CN 109036285A CN 201810630290 A CN201810630290 A CN 201810630290A CN 109036285 A CN109036285 A CN 109036285A
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- 239000010409 thin film Substances 0.000 claims abstract description 144
- 239000010408 film Substances 0.000 claims description 40
- 239000003990 capacitor Substances 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 8
- 230000005611 electricity Effects 0.000 claims description 7
- 239000002096 quantum dot Substances 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 6
- 239000013078 crystal Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 101100489584 Solanum lycopersicum TFT1 gene Proteins 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005401 electroluminescence Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
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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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- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Control Of El Displays (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
The invention discloses a kind of pixel-driving circuits, the pixel-driving circuit is on the basis of existing structure, it increases the first end for being connected to electrooptic element and drives the 5th thin film transistor (TFT) between transistor, by the opening and closing for controlling the 5th thin film transistor (TFT) with the first reversed pulse signal of scanning signal；5th thin film transistor (TFT) is closed in compensated stage influence of the electrooptic element to the alternate path end voltage of compensation transistor is isolated, guarantee the reliability of threshold voltage compensation, it is ensured that the driving current size for inputting electrooptic element is unrelated with the driving threshold voltage of transistor；The invention also discloses the display devices including the pixel-driving circuit.
Description
Technical field
The present invention relates to field of display technology more particularly to the pixel-driving circuits and display dress of a kind of current drive-type
It sets.
Background technique
The display technology of maturation is LCD (liquid crystal display) technology on the market at present, and OLED (ORGANIC ELECTROLUMINESCENCE DISPLAYS
Device), QLED (quanta point electroluminescent display), the novel display technology such as Micro-LED (miniature electroluminescent display) with
High contrast brought by self-luminous, high colour gamut, wide viewing angle, low energy consumption, low reaction time and its more frivolous advantage are big
Family is of interest.
LCD uses voltage driving mode, and pixel-driving circuit only has 1 switch TFT (thin film transistor (TFT)), and OLED,
The novel display technology such as QLED, Micro-LED mainly uses current driver mode.By taking OLED display as an example, basic pixel
Driving circuit at least contains 2 TFT1 capacitors (2T1C), including 1 switch TFT and 1 driving TFT, TFT is driven to connect
Connect the anode of Organic Light Emitting Diode OLED.But 2T1C pixel-driving circuit is used, the threshold of driving TFT is caused due to processing procedure
The drift value difference meeting of threshold voltage Vth difference or working condition lower threshold voltages Vth are so that input Organic Light Emitting Diode
The driving current I of OLED anodeiDifference causes the problems such as showing unevenness to influence pixel intensity.
A variety of pixel compensation circuits are had investigated for each family of such problem, compensate the difference of threshold voltage vt h, ancient name for China
A kind of general N-type pixel-driving circuit that 4T1C is described in patent CN102007527B, circuit structure as shown in Figure 1, when
Sequence figure is as shown in Figure 2.The driving principle of the pixel-driving circuit is mainly four-stage: Reset stage, Compensate rank
Section, Date in stage, Emitting stage finally enter electrooptic element by the crawl and compensation to threshold voltage vt h
Driving current IiIt is unrelated with the driving threshold voltage vt h of TFT.
The pixel-driving circuit theoretically can compensate for threshold voltage vt h drift, but not consider in practical work process
The equivalent bulky capacitor that electrooptic element is formed in the off case.As shown in figure 3, being filled since the equivalent bulky capacitor can not be full of
Electric current is very big always, the Reset stage (t1-t3) drive source terminal (end S in Fig. 1) voltage of TFT stuck a steady state value without
Method resets, therefore is unable to complete the compensation to threshold voltage vt h, and technical effect expected from the patent is not achieved.
In addition, the pixel-driving circuit, there is also signal complexity and Ui signal low and high level pressure difference are excessive, signal is supported tired
Difficult problem.The Compensate stage (t3~t4) drives the end the Gate voltage Vg of TFT to meet: Vg=Vdate+Vth+V1-V2；
The luminescent condition of electrooptic element are as follows: Vg-Vs-Vth > 0, i.e. Vdate+V1-V2 > Vs；Drive TFT work in the condition of saturation region
Are as follows: Vds >=Vgs-Vth, i.e. Vdate+V1-V2≤Vd；The Compensate stage (t3~t4) guarantees electrooptic element shutdown
Condition are as follows: Vs-Vcom < Vi.Wherein Vg, Vs, Vd, Vds, Vgs are respectively the grid voltage for driving TFT, source voltage, drain electrode electricity
Pressure, drain-source voltage is poor, gate-source voltage is poor, and Vdate is data voltage, V1, V2 be respectively Ui signal high level voltage and
Low level voltage, Vcom are common voltage, and VDD is supply voltage, ViFirst end and second end when being connected for electrooptic element
Voltage difference.The common voltage of display device is set are as follows: Vcom=-4.5V,
Vi=3V, VDD=4.5V, therefore Vdate, V1, V2 meet: -1.5V < Vdate+V1-V1 < 4.5V and Vdate < -
1.5V.Common Vdate range is -7V~-2V, and the low and high level difference V1-V2 of Ui signal need to be in 6.5V or so, therefore UI signal
It generates and input is difficult.
Summary of the invention
In order to solve the above technical problems, can stablize the invention discloses a kind of pixel-driving circuit to driving transistor
Threshold voltage shift compensate, promote the stability of driving current, and input signal is simple.
Technical solution provided by the invention is as follows:
The invention discloses a kind of pixel-driving circuits, comprising: first film transistor, the second thin film transistor (TFT), third
Thin film transistor (TFT), the 4th thin film transistor (TFT), the 5th thin film transistor (TFT), first capacitor and electrooptic element；
The control terminal of first film transistor inputs the second pulse signal, the first path terminal input of first film transistor
The alternate path end of supply voltage and the first pole plate for connecting first capacitor, first film transistor connects the second thin film transistor (TFT)
Alternate path end and third thin film transistor (TFT) the first path terminal；
The control terminal of second thin film transistor (TFT) inputs scanning signal, the first path terminal connection first of the second thin film transistor (TFT)
Second pole plate of capacitor and the control terminal of third thin film transistor (TFT)；
The alternate path end of third thin film transistor (TFT) connects the first path terminal and the 5th film crystalline substance of the 4th thin film transistor (TFT)
First path terminal of body pipe；
The control terminal of 4th thin film transistor (TFT) inputs scanning signal, the alternate path end input data of the 4th thin film transistor (TFT)
Voltage；
The path terminal of 5th thin film transistor (TFT) inputs the first pulse signal, the alternate path end connection of the 5th thin film transistor (TFT)
The first end of electrooptic element；
The second end of electrooptic element inputs constant pressure low level.
Preferably, the first film transistor, the second thin film transistor (TFT), third thin film transistor (TFT), the 4th film crystal
Pipe and the 5th thin film transistor (TFT) are N-type TFT.
Preferably, the electrooptic element is Organic Light Emitting Diode, light emitting diode with quantum dots, micro- light emitting diode
It is one of.
Preferably, the driving stage of the pixel-driving circuit includes reset phase, compensated stage and light emitting phase；
In reset phase, first pulse signal provides low potential, and scanning signal provides high potential, the second pulse signal
High potential is provided；
In compensated stage, first pulse signal provides low potential, and scanning signal provides high potential, the second pulse signal
Low potential is provided；
In light emitting phase, first pulse signal provides high potential, and scanning signal provides low potential.
Preferably, the light emitting phase includes the first sub-stage and the second sub-stage；
In the first sub-stage, the first pulse signal provides high potential, and scanning signal provides low potential, and the second pulse signal mentions
For low potential；
In the second sub-stage, the first pulse signal provides high potential, and scanning signal provides low potential, and the second pulse signal mentions
For high potential.
Preferably, second sub-stage of corresponding n-th frame by n-th frame (n is positive integer) the first sub-stage end
Time duration to the (n+1)th frame reset phase at the beginning of.
The invention also discloses a kind of driving methods of pixel-driving circuit, are applied to pixel described in any of the above embodiments and drive
Dynamic circuit, comprising steps of
Step 1: into reset phase:
First pulse signal provides low potential, and scanning signal provides high potential, and the second pulse signal provides high potential；
The first film transistor, the second thin film transistor (TFT), third thin film transistor (TFT) and the 4th thin film transistor (TFT) are opened,
The shutdown of 5th thin film transistor (TFT)；The control terminal of third thin film transistor (TFT) and the first path terminal charge to supply voltage；
Step 2: into compensated stage:
First pulse signal provides low potential, and scanning signal provides high potential, and the second pulse signal provides high potential；
The first film transistor and the shutdown of the 5th thin film transistor (TFT), the second thin film transistor (TFT), third thin film transistor (TFT)
It is opened with the 4th thin film transistor (TFT)；The control terminal of third thin film transistor (TFT) and the first path terminal are discharged to the first electricity by supply voltage
Pressure, the first voltage are calculated by following formula: V1=Vdate+Vth, wherein V1 is first voltage, and Vdate is data
Voltage, Vth are the threshold voltage of third thin film transistor (TFT)；
Step 3: into light emitting phase:
First pulse signal provides high potential, and scanning signal provides low potential；
Second thin film transistor (TFT) and the shutdown of the 4th thin film transistor (TFT), third thin film transistor (TFT) and the 5th thin film transistor (TFT) are beaten
It opens；
The control terminal voltage of third thin film transistor (TFT) maintains the first voltage；
The alternate path end of third thin film transistor (TFT) is discharged to second voltage, and the second voltage is calculated by following formula
It arrives: V3=VEE+Vi, wherein V3 is second voltage, and VEE is constant pressure low level, ViFirst end and the when for electrooptic element conducting
The voltage difference at two ends.
Preferably, the third step includes:
Into the first sub-stage:
First pulse signal provides high potential, and scanning signal provides low potential, and the second pulse signal provides low potential；
First film transistor, the second thin film transistor (TFT) and the shutdown of the 4th thin film transistor (TFT), third thin film transistor (TFT) and the 5th film are brilliant
Body pipe is opened；
Into the second sub-stage:
First pulse signal provides high potential, and scanning signal provides low potential, and the second pulse signal provides low potential；
Second thin film transistor (TFT) and the shutdown of the 4th thin film transistor (TFT), first film transistor, third thin film transistor (TFT) and the 5th film are brilliant
Body pipe is opened.
Preferably, the reset phase of the (n+1)th frame is entered after second sub-stage of corresponding n-th frame.
The invention also discloses a kind of display devices, are the display device of current drive-type, including any of the above-described institute
The pixel-driving circuit stated.
Compared with prior art, the present invention can bring it is at least one of following the utility model has the advantages that
1, the 5th newly-increased thin film transistor (TFT) is closed in compensated stage electrooptic element is isolated to the of driving transistor
The influence of two-way wire-end voltage guarantees the reliability of threshold voltage compensation, it is ensured that inputs the driving current size of electrooptic element
It is unrelated with the threshold voltage of thin film transistor (TFT)；
2, simplify input signal, the first path terminal of the first pole plate connection first film transistor of first capacitor simultaneously inputs
Second pole plate of supply voltage, first capacitor connects the first path terminal of the second thin film transistor (TFT) and the control of third thin film transistor (TFT)
End processed, without additional input signal；
3, simplify input signal, the control terminal input of the control terminal of the second thin film transistor (TFT) and the 4th thin film transistor (TFT) is identical
Scanning signal；
4, simplify input signal, differ biggish Ui signal without low and high level, each input signal is supported simple.
Detailed description of the invention
Below by clearly understandable mode, preferred embodiment is described with reference to the drawings, the present invention is given furtherly
It is bright.
Fig. 1 is a kind of structural schematic diagram of pixel-driving circuit in the prior art；
Fig. 2 is the time diagram of pixel-driving circuit shown in Fig. 1；
Fig. 3 is the waveform of input signal in pixel-driving circuit shown in Fig. 1, node voltage and equivalent bulky capacitor charging current
Schematic diagram；
Fig. 4 is the structural schematic diagram of present invention pixel driving circuit；
Fig. 5 is the time diagram of pixel-driving circuit shown in Fig. 4；
Fig. 6-8 is the driving stage schematic diagram of pixel-driving circuit shown in Fig. 4
Fig. 9 is the waveform of input signal in pixel-driving circuit shown in Fig. 4, node voltage and equivalent bulky capacitor charging current
Schematic diagram；
Figure 10 is the Vth-I of pixel-driving circuit and basis 2T1C pixel-driving circuit shown in Fig. 4iWaveform diagram.
Specific embodiment
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, Detailed description of the invention will be compareed below
A specific embodiment of the invention.It should be evident that drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing, and obtain other embodiments.
To make simplified form, part related to the present invention is only schematically shown in each figure, they are not represented
Its practical structures as product.In addition, there is identical structure or function in some figures so that simplified form is easy to understand
Component only symbolically depicts one of those, or has only marked one of those.Herein, "one" is not only indicated
" only this ", can also indicate the situation of " more than one ".
As shown in figure 4, pixel-driving circuit of the invention is that electric current drives type, comprising: first film transistor T1, the
Two thin film transistor (TFT) T2, third thin film transistor (TFT) T3, the 4th thin film transistor (TFT) T4, the 5th thin film transistor (TFT) T5, first capacitor C1
And electrooptic element.First film transistor T1, the second thin film transistor (TFT) T2, third thin film transistor (TFT) T3, the 4th film are brilliant
Body pipe T4 and the 5th thin film transistor (TFT) T5 is N-type TFT.Electrooptic element can be Organic Light Emitting Diode, quantum
Point luminescent diode, micro- light emitting diode etc., the luminous intensity of electrooptic element is by flowing through the electric current of its first end and second end
Size determines.
Third thin film transistor (TFT) T3 is driving transistor (Driving TFT), and when opening is generally operational in thin film transistor (TFT)
Saturation region, for control input electrooptic element driving current Ii。
Wherein, the control terminal of first film transistor T1 inputs the second pulse signal EMIT2, first film transistor T1's
First path terminal input supply voltage VDD and the first pole plate for connecting first capacitor C1, the second of first film transistor T1 are logical
Terminal connects the alternate path end of the second thin film transistor (TFT) T2 and the first path terminal of third thin film transistor (TFT) T3.Second film is brilliant
The path terminal of body pipe T2 inputs scanning signal Scan, and the of the first path terminal connection first capacitor C1 of the second thin film transistor (TFT) T2
The control terminal of two pole plates and third thin film transistor (TFT) T3.The alternate path end of third thin film transistor (TFT) T3 connects the 4th film crystal
The first path terminal of pipe T4 and the first path terminal of the 5th thin film transistor (TFT) T5.The control terminal input of 4th thin film transistor (TFT) T4 is swept
Retouch signal Scan, the alternate path end input data voltage Vdate of the 4th thin film transistor (TFT) T4.The control of 5th thin film transistor (TFT) T5
End processed inputs the first end of the alternate path end connection electrooptic element of the first pulse signal EMIT1, the 5th thin film transistor (TFT) T5,
The second end of electrooptic element inputs constant pressure low level VEE.By taking Organic Light Emitting Diode OLED as an example, the first of electrooptic element
End is the anode of Organic Light Emitting Diode OLED, and the second end of electrooptic element is the yin of Organic Light Emitting Diode OLED
Pole.
The driver' s timing of present invention pixel driving circuit is as shown in figure 5, include following three phases:
1. reset phase Reset (t1~t2): the first pulse signal EMIT1 provides low potential, and scanning signal Scan is provided
High potential, the second pulse signal EMIT2 provide high potential；
Comparative diagram 6, first film transistor T1, the second thin film transistor (TFT) T2, third thin film transistor (TFT) T3 and the 4th film
Transistor T4 is opened, the 5th thin film transistor (TFT) T5 shutdown；
The first path terminal voltage Vd of the control terminal voltage Vg and third thin film transistor (TFT) T3 of third thin film transistor (TFT) T3 fill
Electricity charges to data voltage Vdate to supply voltage VDD, the alternate path end voltage Vs of third thin film transistor (TFT) T3.
2. compensated stage Compensate+Date in (t2~t3): the first pulse signal EMIT1 provides low potential, scanning
Signal Scan provides high potential, and the second pulse signal EMIT2 is reduced to low potential；
Comparative diagram 7, first film transistor T1 and the 5th thin film transistor (TFT) T5 shutdown, the second thin film transistor (TFT) T2, third
Thin film transistor (TFT) T3 and the 4th thin film transistor (TFT) T4 is opened；
The alternate path end voltage Vs of third thin film transistor (TFT) T3 keeps data voltage Vdate, due to third film crystal
Pipe T3 unlatching makes Vd-Vs=Vth, and the first path terminal of the control terminal of third thin film transistor (TFT) T3 and third thin film transistor (TFT) T3
By the second thin film transistor (TFT) T2 connection of unlatching, therefore the control terminal voltage Vg of third thin film transistor (TFT) T3 and third film are brilliant
The first path terminal voltage Vd of body pipe T3 is discharged to first voltage V1 by supply voltage VDD, and first voltage V1 is by following formula meter
Obtain: V1=Vdate+Vth, wherein V1 is first voltage, and Vdate is data voltage, and Vth is third thin film transistor (TFT) T3's
Threshold voltage.
3. light emitting phase Emitting (t3~next frame t1): including the first sub-stage, within t3~t4 time, first
Pulse signal EMIT1 rises to high potential, and scanning signal Scan is reduced to low potential, and the second pulse signal EMIT2 provides low electricity
Position；It further include the second sub-stage, within t4~next frame t1 time, the first pulse signal EMIT1 provides high potential, scanning letter
Number Scan provides low potential, and the second pulse signal EMIT2 rises to high potential；Enter after the second sub-stage of corresponding n-th frame
The reset phase of (n+1)th frame；
Comparative diagram 8, the second thin film transistor (TFT) T2 and the 4th thin film transistor (TFT) T4 shutdown, third thin film transistor (TFT) T3 and the 5th
Thin film transistor (TFT) T5 is opened；
The control terminal voltage Vg of third thin film transistor (TFT) T3 is maintained at first voltage, in the situation of electrooptic element conducting
Under, the alternate path end of third thin film transistor (TFT) T3 is discharged to second voltage V3, and second voltage V3 is calculated by following formula:
V3=VEE+Vi；Input the driving current I of electrooptic element first endiMeet: Ii∝(Vg-Vs-Vth)2=[(Vdate+
Vth)-(VEE+Vi)-Vth]2=(Vdate-VEE-Vi)2.Wherein V3 is second voltage, and Vdate is data voltage, and VEE is perseverance
Force down level, ViThe voltage difference of first end and second end when being connected for electrooptic element.Therefore driving current IiWith third film
The threshold voltage vt h of transistor T3 is unrelated, and the luminous intensity of Organic Light Emitting Diode is not influenced by threshold voltage Vth shift.
Pixel-driving circuit in pixel-driving circuit comparison patent CN102007527B of the invention, in electrooptic element
First end and third thin film transistor (TFT) T3 (driving TFT) between increase the 5th thin film transistor (TFT) T5, with scanning signal Scan
The first reversed pulse signal EMIT controls the 5th thin film transistor (TFT) and closes in compensated stage.Electrooptic element is in the off case
The equivalent bulky capacitor being connected between constant pressure low level VEE and the 5th transistor T5 is formed, as shown in figure 9, the 5th film crystal
Pipe M5 can isolate influence of the electrooptic element to the alternate path end voltage Vs of third thin film transistor (TFT) T3, prevent electrooptics first
The equivalent bulky capacitor that part is constituted in the off case is not fully filled electricity always and causes the voltage value of Vs stuck, guarantees threshold voltage vt h
The reliability of compensation.As shown in Figure 10, the 2T1C circuit on basis is compared, pixel-driving circuit of the invention largely subtracts
Light threshold voltage vt h drift is to driving circuit IiInfluence.
Pixel-driving circuit of the invention is also effectively simplified input signal, specifically includes: the first pole of first capacitor C1
Plate connects the first path terminal and input supply voltage VDD of first film transistor T1, the second pole plate connection of first capacitor C1
The first path terminal of second thin film transistor (TFT) T2 and the control terminal of third thin film transistor (TFT) T3, without additional input signal, and
Layout design and manufacturing process are simple；The control terminal of second thin film transistor (TFT) T2 and the control terminal input of the 4th thin film transistor (TFT) T4
Identical scanning signal Scan, simplifies input signal；Biggish UI is differed without low and high level in patent CN102007527B
Signal, each input signal are supported simple.For pixel-driving circuit, the simplification of input signal can be effectively reduced in pixel region
Signal transmit cabling, be conducive to expand pixel aperture ratio and reduce production cost.
The invention also discloses a kind of organic light-emitting display device, which includes: criss-cross
Scan line and data line, are intersected the pixel region limited by scan line and data line at output of pulse signal device, and scan line will scan
Voltage Scan inputs each pixel region, and data voltage Vdate is inputted each pixel region by data line, and output of pulse signal device is by the
One pulse voltage EMIT1 and the second pulse voltage EMIT2 inputs each pixel region, is equipped with above-mentioned pixel in each pixel region and drives
Dynamic circuit.
It should be noted that above-described embodiment can be freely combined as needed.The above is only of the invention preferred
Embodiment, it is noted that for those skilled in the art, in the premise for not departing from the principle of the invention
Under, multiple improvements and modifications can also be made, these modifications and embellishments should also be considered as the scope of protection of the present invention.
Claims (10)
1. a kind of pixel-driving circuit characterized by comprising first film transistor, the second thin film transistor (TFT), third film
Transistor, the 4th thin film transistor (TFT), the 5th thin film transistor (TFT), first capacitor and electrooptic element；
The control terminal of first film transistor inputs the second pulse signal, the first path terminal input power of first film transistor
Voltage and the first pole plate for connecting first capacitor, the alternate path end of first film transistor connect the of the second thin film transistor (TFT)
First path terminal of two path terminals and third thin film transistor (TFT)；
The control terminal of second thin film transistor (TFT) inputs scanning signal, and the first path terminal of the second thin film transistor (TFT) connects first capacitor
The second pole plate and third thin film transistor (TFT) control terminal；
The alternate path end of third thin film transistor (TFT) connects the first path terminal and the 5th thin film transistor (TFT) of the 4th thin film transistor (TFT)
The first path terminal；
The control terminal of 4th thin film transistor (TFT) inputs scanning signal, the alternate path end input data electricity of the 4th thin film transistor (TFT)
Pressure；
The path terminal of 5th thin film transistor (TFT) inputs the first pulse signal, and the alternate path end of the 5th thin film transistor (TFT) connects electric light
Learn the first end of element；
The second end of electrooptic element inputs constant pressure low level.
2. pixel-driving circuit according to claim 1, it is characterised in that:
The first film transistor, the second thin film transistor (TFT), third thin film transistor (TFT), the 4th thin film transistor (TFT) and the 5th film
Transistor is N-type TFT.
3. pixel-driving circuit according to claim 1, it is characterised in that:
The electrooptic element is the one of which of Organic Light Emitting Diode, light emitting diode with quantum dots, micro- light emitting diode.
4. pixel-driving circuit according to claim 1, it is characterised in that:
The driving stage of the pixel-driving circuit includes reset phase, compensated stage and light emitting phase；
In reset phase, first pulse signal provides low potential, and scanning signal provides high potential, and the second pulse signal provides
High potential；
In compensated stage, first pulse signal provides low potential, and scanning signal provides high potential, and the second pulse signal provides
Low potential；
In light emitting phase, first pulse signal provides high potential, and scanning signal provides low potential.
5. pixel-driving circuit according to claim 4, it is characterised in that:
The light emitting phase includes the first sub-stage and the second sub-stage；
In the first sub-stage, the first pulse signal provides high potential, and scanning signal provides low potential, and the second pulse signal provides low
Current potential；
In the second sub-stage, the first pulse signal provides high potential, and scanning signal provides low potential, and the second pulse signal provides high
Current potential.
6. pixel-driving circuit according to claim 5, it is characterised in that:
Second sub-stage of corresponding n-th frame extends to the by the end time of the first sub-stage of n-th frame (n is positive integer)
At the beginning of the reset phase of n+1 frame.
7. a kind of driving method of pixel-driving circuit, which is characterized in that be applied to as described in any one of claims 1 to 6
Pixel-driving circuit, comprising steps of
Step 1: into reset phase:
First pulse signal provides low potential, and scanning signal provides high potential, and the second pulse signal provides high potential；
The first film transistor, the second thin film transistor (TFT), third thin film transistor (TFT) and the 4th thin film transistor (TFT) are opened, and the 5th
Thin film transistor (TFT) shutdown；The control terminal of third thin film transistor (TFT) and the first path terminal charge to supply voltage；
Step 2: into compensated stage:
First pulse signal provides low potential, and scanning signal provides high potential, and the second pulse signal provides high potential；
The first film transistor and the shutdown of the 5th thin film transistor (TFT), the second thin film transistor (TFT), third thin film transistor (TFT) and the
Four thin film transistor (TFT)s are opened；The control terminal of third thin film transistor (TFT) and the first path terminal are discharged to first voltage by supply voltage,
The first voltage is calculated by following formula: V1=Vdate+Vth, and wherein V1 is first voltage, and Vdate is data electricity
Pressure, Vth are the threshold voltage of third thin film transistor (TFT)；
Step 3: into light emitting phase:
First pulse signal provides high potential, and scanning signal provides low potential；
Second thin film transistor (TFT) and the shutdown of the 4th thin film transistor (TFT), third thin film transistor (TFT) and the 5th thin film transistor (TFT) are opened；
The control terminal voltage of third thin film transistor (TFT) maintains the first voltage；
The alternate path end of third thin film transistor (TFT) is discharged to second voltage, and the second voltage is calculated by following formula:
V3=VEE+Vi, wherein V3 is second voltage, and VEE is constant pressure low level, ViFirst end and second end when being connected for electrooptic element
Voltage difference.
8. the driving method of pixel-driving circuit according to claim 7, it is characterised in that:
The third step includes:
Into the first sub-stage:
First pulse signal provides high potential, and scanning signal provides low potential, and the second pulse signal provides low potential；First
Thin film transistor (TFT), the second thin film transistor (TFT) and the shutdown of the 4th thin film transistor (TFT), third thin film transistor (TFT) and the 5th thin film transistor (TFT)
It opens；
Into the second sub-stage:
First pulse signal provides high potential, and scanning signal provides low potential, and the second pulse signal provides low potential；Second
Thin film transistor (TFT) and the shutdown of the 4th thin film transistor (TFT), first film transistor, third thin film transistor (TFT) and the 5th thin film transistor (TFT)
It opens.
9. the driving method of pixel-driving circuit according to claim 8, it is characterised in that:
Enter the reset phase of the (n+1)th frame after second sub-stage of corresponding n-th frame.
10. a kind of display device is the display device of current drive-type, it is characterised in that: including such as claim 1~6 times
Pixel-driving circuit described in one.
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| CN201810630290.6A CN109036285B (en) | 2018-06-19 | 2018-06-19 | Pixel driving circuit and display device |
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| CN110428774A (en) * | 2019-07-19 | 2019-11-08 | 深圳市华星光电半导体显示技术有限公司 | Pixel-driving circuit and display panel |
| CN110706641A (en) * | 2019-09-16 | 2020-01-17 | 深圳市华星光电半导体显示技术有限公司 | Pixel driving circuit and display device |
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| CN1664901A (en) * | 2004-03-04 | 2005-09-07 | 精工爱普生株式会社 | Pixel circuit |
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| CN110428774A (en) * | 2019-07-19 | 2019-11-08 | 深圳市华星光电半导体显示技术有限公司 | Pixel-driving circuit and display panel |
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