CN109192142A - OLED pixel driving circuit and driving method - Google Patents
OLED pixel driving circuit and driving method Download PDFInfo
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- CN109192142A CN109192142A CN201811096620.4A CN201811096620A CN109192142A CN 109192142 A CN109192142 A CN 109192142A CN 201811096620 A CN201811096620 A CN 201811096620A CN 109192142 A CN109192142 A CN 109192142A
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000010409 thin film Substances 0.000 claims abstract description 239
- 239000010408 film Substances 0.000 claims description 74
- 239000003990 capacitor Substances 0.000 claims description 19
- 238000004020 luminiscence type Methods 0.000 claims description 12
- 230000005611 electricity Effects 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 5
- 230000003760 hair shine Effects 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 claims 1
- 230000003071 parasitic effect Effects 0.000 abstract description 10
- 239000013078 crystal Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 229920001621 AMOLED Polymers 0.000 description 5
- 239000000126 substance Substances 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 230000003446 memory effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 241001269238 Data Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004643 material aging Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3258—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the voltage across the light-emitting element
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Control Of El Displays (AREA)
Abstract
The present invention provides a kind of OLED pixel driving circuit and driving method.OLED pixel driving circuit of the invention uses the framework of 4T1C, and using a cabling in different phase respectively as data line and sense wire, it arranges in pairs or groups specific control sequential, the threshold voltage of driving thin film transistor (TFT) can be compensated, keep the electric current for flowing through Organic Light Emitting Diode unrelated with the driving threshold voltage of thin film transistor (TFT), improve the uniformity of display, the space of cabling is effectively saved simultaneously, the light-emitting area for being conducive to improve pixel, reduces parasitic capacitance, promotes the quality of product.
Description
Technical field
The present invention relates to field of display technology more particularly to a kind of OLED pixel driving circuits and driving method.
Background technique
Organic Light Emitting Diode (Organic Light Emitting Display, OLED) display device has spontaneous
Light, driving voltage are low, luminous efficiency is high, the response time is short, clarity and contrast are high, nearly 180 ° of visual angles, use temperature ranges
Many advantages, such as wide, achievable Flexible Displays and large area total colouring, is known as being the aobvious of most development potentiality by industry
Showing device.
OLED display according to driving method can be divided into passive matrix OLED (Passive Matrix OLED,
) and active array type OLED (Active Matrix OLED, AMOLED) two major classes, i.e. directly addressing and film crystal PMOLED
Manage two class of (Thin Film Transistor, TFT) matrix addressing.Wherein, AMOLED has the pixel in array arrangement, belongs to
In active display type, the efficiency that shines is high, is typically used as large scale display device high-definition.
AMOLED is current driving apparatus, when there is electric current to flow through Organic Light Emitting Diode, organic light-emitting diode,
And light emission luminance is determined by the electric current for flowing through Organic Light Emitting Diode itself.Most of existing integrated circuit (IC) is all only transmitted
Voltage signal, therefore the task that the pixel-driving circuit of AMOLED needs to complete for voltage signal to be changed into current signal.
Referring to Fig. 1, a kind of existing OLED pixel driving circuit includes first film transistor T10, the second film crystalline substance
The grid of body pipe T20, capacitor C10 and Organic Light Emitting Diode D10, the first film transistor T10 access scanning signal
Gate, source electrode incoming data signal voltage Data, drain electrode are electrically connected the grid of the second thin film transistor (TFT) T20.Described second is thin
The source electrode of film transistor T20 accesses power supply positive voltage OVDD, and drain electrode is electrically connected the anode of organic light emitting diode D10.It is described
The cathode of Organic Light Emitting Diode D1 accesses power supply negative voltage OVSS.It is thin that the both ends of the capacitor C10 are electrically connected second
The grid and source electrode of film transistor T20.First film transistor T10 is switching thin-film transistor, and the second thin film transistor (TFT) T20 is
Drive thin film transistor (TFT).When work, scanning signal Gate controls first film transistor T10 conducting, voltage data signal Data
The grid of the second thin film transistor (TFT) T20 is written and stores to one end of capacitor C10, the second thin film transistor (TFT) T20 is connected, it is organic
Light emitting diode D10 shines.Processing procedure it is unstable etc. due to, in the pixel-driving circuit of OLED display different pixels
It drives the threshold voltage of thin film transistor (TFT) can be variant, after long-time use, drives thin-film-transistor material aging and variation
The threshold voltage that will lead to driving thin film transistor (TFT) generates drift, and the driving film in the pixel-driving circuit of different pixels is brilliant
The threshold voltage shift amount of body pipe is different, causes picture to show non-uniform phenomenon, for this purpose, the prior art can generally drive pixel
The threshold voltage of the driving thin film transistor (TFT) of dynamic circuit compensates.Common compensation way needs respective pixel driving circuit to set
Threshold voltage of the sense wire (sensing line) to drive thin film transistor (TFT) in sensor pixel driving circuit is set, then logarithm
It is adjusted accordingly according to voltage to be compensated to the threshold voltage of driving thin film transistor (TFT), and in existing pixel-driving circuit
It is already provided with the data line (data line) for being used for transmission voltage data signal and the scan line for being used for transmission scanning signal
The setting of (scan line), sense wire increase the quantity of cabling, and the quantity of cabling increases so that the light-emitting area of pixel subtracts
It is small, and parasitic capacitance can be also generated between cabling, influence the input of signal.
Summary of the invention
The purpose of the present invention is to provide a kind of OLED pixel driving circuits, can be to the threshold value electricity for driving thin film transistor (TFT)
Pressure compensates, while effectively saving the space of cabling, is conducive to the light-emitting area for improving pixel, reduces parasitic capacitance.
Another object of the present invention is to provide a kind of OLED pixel driving methods, can be to the threshold of driving thin film transistor (TFT)
Threshold voltage compensates, and is conducive to improve the light-emitting area of pixel, reduces parasitic capacitance.
To achieve the above object, present invention firstly provides OLED pixel driving circuits, including first film transistor, second
Thin film transistor (TFT), third thin film transistor (TFT), the 4th thin film transistor (TFT), capacitor, Organic Light Emitting Diode, cabling, first switch,
Two switches, source electrode driver and detecting module；
The grid of the first film transistor accesses scanning signal, and drain electrode accesses supply voltage and electric connection second is thin
The drain electrode of film transistor, source electrode are electrically connected the grid of the second thin film transistor (TFT)；The source electrode of second thin film transistor (TFT) is electrical
Connect the source electrode of the 4th thin film transistor (TFT)；The grid of the third thin film transistor (TFT) accesses scanning signal, and source electrode is electrically connected
Line, drain electrode are electrically connected the source electrode of the second thin film transistor (TFT)；The grid of 4th thin film transistor (TFT) accesses luminous signal, drain electrode
It is electrically connected the anode of organic light emitting diode；The second film crystal is electrically connected in the first end and second end of the capacitor
The grid and source electrode of pipe；The cathode of the Organic Light Emitting Diode accesses power supply negative voltage；The first end electricity of the first switch
Property connection cabling, second end be electrically connected source electrode driver；The first end of the second switch is electrically connected cabling, second end electricity
Property connection detecting module；The detecting module is electrically connected the source electrode driver.
The working condition of the OLED pixel driving circuit includes sensing stage and display stage；
The sensing stage includes threshold voltage memory phase and threshold voltage reconnaissance phase；
In threshold voltage memory phase, scanning signal controls first film transistor and the conducting of third thin film transistor (TFT), hair
Optical signal controls the cut-off of the 4th thin film transistor (TFT), first switch closure, and second switch disconnects, and the second film is written in power supply positive voltage
Initialization voltage is written to the source electrode of the second thin film transistor (TFT) in the grid of transistor, source electrode driver, the second thin film transistor (TFT)
Source voltage increases continuously until the difference equal to power supply positive voltage and the second thin film transistor (TFT) threshold voltage；
In threshold voltage reconnaissance phase, scanning signal controls first film transistor and the conducting of third thin film transistor (TFT), hair
Optical signal controls the cut-off of the 4th thin film transistor (TFT), and first switch disconnects, and second switch closure, it is brilliant that detecting module detects the second film
The source voltage of body pipe obtains the second thin film transistor (TFT) threshold voltage data；
The display stage includes voltage data signal memory phase and luminescence display stage；
In voltage data signal memory phase, scanning signal control first film transistor and third thin film transistor (TFT) are led
Logical, luminous signal controls the cut-off of the 4th thin film transistor (TFT), first switch closure, and second switch disconnects, detecting module transmission second
Thin film transistor (TFT) threshold voltage data to source electrode driver, source electrode driver is believed to the source electrode of the second thin film transistor (TFT) write-in data
The difference of number voltage and the second thin film transistor (TFT) threshold voltage；
In the luminescence display stage, scanning signal controls first film transistor and the cut-off of third thin film transistor (TFT), and shine letter
Number control the 4th thin film transistor (TFT) conducting, first switch disconnect, second switch disconnect, organic light-emitting diode.
In threshold voltage memory phase, scanning signal is high potential, and luminous signal is low potential；
In threshold voltage reconnaissance phase, scanning signal is high potential, and luminous signal is low potential；
In voltage data signal memory phase, scanning signal is high potential, and luminous signal is low potential；
In the luminescence display stage, scanning signal is low potential, and luminous signal is high potential.
The cabling includes the first sub- cabling and the second sub- cabling；One end of the first sub- cabling is electrically connected first and opens
The first end of pass, the other end are electrically connected one end of the second sub- cabling；The other end of the second sub- cabling is electrically connected second
The first end of switch；The source electrode of third thin film transistor (TFT) is electrically connected the other end of the first sub- cabling.
The detecting module is analog-digital converter.
The source voltage that the detecting module detects the second thin film transistor (TFT) obtains the second thin film transistor (TFT) threshold voltage number
According to detailed process are as follows: detecting module detect the second thin film transistor (TFT) source voltage simultaneously converted, obtain power supply positive voltage
With the difference data of the second thin film transistor (TFT) threshold voltage, power supply positive voltage then is subtracted using preset power supply positive voltage data
With the difference data of the second thin film transistor (TFT) threshold voltage, the second thin film transistor (TFT) threshold voltage data is obtained.
The present invention also provides a kind of OLED pixel driving methods, include the following steps:
Step S1, OLED pixel driving circuit as described in claim 1 is provided；
Step S2, into threshold voltage memory phase；
Scanning signal controls first film transistor and the conducting of third thin film transistor (TFT), and it is brilliant that luminous signal controls the 4th film
The cut-off of body pipe, first switch closure, second switch disconnect, and the grid of the second thin film transistor (TFT) is written in power supply positive voltage, and source electrode drives
Initialization voltage is written to the source electrode of the second thin film transistor (TFT) in dynamic device, and the source voltage of the second thin film transistor (TFT) increases continuously until
Equal to the difference of power supply positive voltage and the second thin film transistor (TFT) threshold voltage；
Step S3, into threshold voltage reconnaissance phase；
Scanning signal controls first film transistor and the conducting of third thin film transistor (TFT), and it is brilliant that luminous signal controls the 4th film
The cut-off of body pipe, first switch disconnect, and second switch closure, the source voltage that detecting module detects the second thin film transistor (TFT) obtains the
Two thin film transistor (TFT) threshold voltage datas；
Step S4, into voltage data signal memory phase；
Scanning signal controls first film transistor and the conducting of third thin film transistor (TFT), and it is brilliant that luminous signal controls the 4th film
The cut-off of body pipe, first switch closure, second switch disconnect, and detecting module transmits the second thin film transistor (TFT) threshold voltage data to source
Voltage data signal and the second film crystal pipe threshold is written to the source electrode of the second thin film transistor (TFT) in driver, source electrode driver
The difference of voltage；
Step S5, into the luminescence display stage；
Scanning signal controls first film transistor and the cut-off of third thin film transistor (TFT), and it is brilliant that luminous signal controls the 4th film
The conducting of body pipe, first switch disconnect, and second switch disconnects, organic light-emitting diode.
In the step S2, scanning signal is high potential, and luminous signal is low potential；
In the step S3, scanning signal is high potential, and luminous signal is low potential；
In the step S4, scanning signal is high potential, and luminous signal is low potential；
In the step S5, scanning signal is low potential, and luminous signal is high potential.
The cabling includes the first sub- cabling and the second sub- cabling；One end of the first sub- cabling is electrically connected first and opens
The first end of pass, the other end are electrically connected one end of the second sub- cabling；The other end of the second sub- cabling is electrically connected second
The first end of switch；The source electrode of third thin film transistor (TFT) is electrically connected the other end of the first sub- cabling.
The detecting module is analog-digital converter；
In the step S3, the source voltage that the detecting module detects the second thin film transistor (TFT) obtains the second film crystal
The detailed process of pipe threshold voltage data are as follows: detecting module is detected the source voltage of the second thin film transistor (TFT) and converted, and obtains
To the difference data of power supply positive voltage and the second thin film transistor (TFT) threshold voltage, then subtracted using preset power supply positive voltage data
The difference data for removing power supply positive voltage and the second thin film transistor (TFT) threshold voltage obtains the second thin film transistor (TFT) threshold voltage number
According to.
Beneficial effects of the present invention: OLED pixel driving circuit of the invention uses the framework of 4T1C, and walks using one
For line in different moments respectively as data line and sense wire, specific control sequential of arranging in pairs or groups can be to driving thin film transistor (TFT)
Threshold voltage compensates, and keeps the electric current for flowing through Organic Light Emitting Diode unrelated with the driving threshold voltage of thin film transistor (TFT), mentions
The uniformity of height display, while the space of cabling is effectively saved, be conducive to the light-emitting area for improving pixel, reduce parasitic electricity
Hold, promotes the quality of product.OLED pixel driving method of the invention can carry out the threshold voltage of driving thin film transistor (TFT)
Compensation, and be conducive to improve the light-emitting area of pixel, reduce parasitic capacitance.
Detailed description of the invention
For further understanding of the features and technical contents of the present invention, it please refers to below in connection with of the invention detailed
Illustrate and attached drawing, however, the drawings only provide reference and explanation, is not intended to limit the present invention.
In attached drawing,
Fig. 1 is a kind of existing circuit diagram of OLED pixel driving circuit；
Fig. 2 is the circuit diagram of OLED pixel driving circuit of the invention；
Fig. 3 is the timing diagram of OLED pixel driving circuit of the invention；
Fig. 4 is the flow chart of OLED pixel driving method of the invention；
Fig. 5 is the schematic diagram of the step S2 of OLED pixel driving method of the invention；
Fig. 6 is the schematic diagram of the step S3 of OLED pixel driving method of the invention；
Fig. 7 is the schematic diagram of the step S4 of OLED pixel driving method of the invention；
Fig. 8 is the schematic diagram of the step S5 of OLED pixel driving method of the invention.
Specific embodiment
Further to illustrate technological means and its effect adopted by the present invention, below in conjunction with preferred implementation of the invention
Example and its attached drawing are described in detail.
Referring to Fig. 2, the present invention provides a kind of OLED pixel driving circuit, using the framework of 4T1C, including the first film
Transistor T1, the second thin film transistor (TFT) T2, third thin film transistor (TFT) T3, the 4th thin film transistor (TFT) T4, capacitor C1, organic light emission two
Pole pipe D1, cabling 10, first switch K1, second switch K2, source electrode driver 20 and detecting module 30.
The grid of the first film transistor T1 accesses scanning signal Scan, and drain electrode access supply voltage OVDD is simultaneously electrical
The drain electrode of the second thin film transistor (TFT) T2 is connected, source electrode is electrically connected the grid of the second thin film transistor (TFT) T2.Second film is brilliant
The source electrode of body pipe T2 is electrically connected the source electrode of the 4th thin film transistor (TFT) T4.The grid of the third thin film transistor (TFT) T3 accesses scanning
Signal Scan, source electrode are electrically connected cabling 10, and drain electrode is electrically connected the source electrode of the second thin film transistor (TFT) T2.4th film is brilliant
The grid of body pipe T4 accesses luminous signal EM, and drain electrode is electrically connected the anode of organic light emitting diode D1.The of the capacitor C1
The grid and source electrode of the second thin film transistor (TFT) T2 is electrically connected in one end and second end.The yin of the Organic Light Emitting Diode D1
Power supply negative voltage OVSS is accessed in pole.The first end of the first switch K1 is electrically connected cabling 10, and second end is electrically connected source electrode
Driver 20.The first end of the second switch K2 is electrically connected cabling 10, and second end is electrically connected detecting module 30.It is described to detect
It surveys module 30 and is electrically connected the source electrode driver 20.Wherein, the second thin film transistor (TFT) T2 is driving thin film transistor (TFT).
Specifically, the detecting module 30 is analog-digital converter ADC.
Preferably, referring to Fig. 2, the cabling 10 includes the first sub- cabling 11 and the second sub- cabling 12.First son
One end of cabling 11 is electrically connected the first end of first switch K1, and the other end is electrically connected one end of the second sub- cabling 12.It is described
The other end of second sub- cabling 12 is electrically connected the first end of second switch K2.The source electrode of third thin film transistor (TFT) T3 is electrically connected
The other end of first sub- cabling 11.
Specifically, incorporated by reference to Fig. 2 and Fig. 3, the working condition of the OLED pixel driving circuit include sensing stage t1 and
Display stage t2.
The sensing stage t1 includes threshold voltage memory phase t11 and threshold voltage reconnaissance phase t12.
Incorporated by reference to Fig. 5, first film transistor T1 and the are controlled in threshold voltage memory phase t11, scanning signal Scan
Three thin film transistor (TFT) T3 conducting, luminous signal EM control the 4th thin film transistor (TFT) T4 cut-off, first switch K1 closure, second switch
K2 is disconnected, and the grid of the second thin film transistor (TFT) T2, source electrode is written in first film transistor T1 of the power supply positive voltage OVDD through being connected
The third thin film transistor (TFT) T3 of the closed first switch K1 of driver 20, cabling 10 and conducting are to the second thin film transistor (TFT) T2's
Source electrode write-in initialization voltage Vref makes at this point, power supply positive voltage OVDD charges to the source electrode of the second thin film transistor (TFT) T2
The source voltage for obtaining the second thin film transistor (TFT) T2 constantly rises, until the source voltage of the second thin film transistor (TFT) T2 is being equal to power supply just
The difference of voltage OVDD and the second thin film transistor (TFT) T2 threshold voltage is simultaneously stored to the second end of capacitor C1.In this stage, due to
4th thin film transistor (TFT) T4 cut-off, Organic Light Emitting Diode D1 do not shine.
Specifically, referring to Fig. 3, in threshold voltage reconnaissance phase t12, scanning signal Scan is that high potential control first is thin
Film transistor T1 and third thin film transistor (TFT) T3 conducting, luminous signal EM are that low potential controls the 4th thin film transistor (TFT) T4 cut-off.
Incorporated by reference to Fig. 6, first film transistor T1 and the are controlled in threshold voltage reconnaissance phase t12, scanning signal Scan
Three thin film transistor (TFT) T3 conducting, luminous signal EM control the 4th thin film transistor (TFT) T4 cut-off, and first switch K1 is disconnected, second switch
The third thin film transistor (TFT) T3 detecting second of K2 closure, the closed second switch K2 of detecting module 30, cabling 10 and conducting is thin
The source voltage of film transistor T2 obtains the second thin film transistor (TFT) T2 threshold voltage data.In this stage, due to the 4th film crystalline substance
Body pipe T4 cut-off, Organic Light Emitting Diode D1 do not shine.
Specifically, the source voltage that the detecting module 30 detects the second thin film transistor (TFT) T2 obtains the second thin film transistor (TFT)
The detailed process of T2 threshold voltage data are as follows: detecting module 30 is detected the source voltage of the second thin film transistor (TFT) T2 and turned
It changes, obtains the difference data of power supply positive voltage OVDD and the second thin film transistor (TFT) T2 threshold voltage, then utilize preset power supply
Positive voltage OVDD data subtract the difference data of power supply positive voltage OVDD and the second thin film transistor (TFT) T2 threshold voltage, obtain second
Thin film transistor (TFT) T2 threshold voltage data.
Specifically, referring to Fig. 3, in threshold voltage memory phase t11, scanning signal Scan is that high potential control first is thin
Film transistor T1 and third thin film transistor (TFT) T3 conducting, luminous signal EM are that low potential controls the 4th thin film transistor (TFT) T4 cut-off.
The display stage t2 includes voltage data signal memory phase t21 and luminescence display stage t22.
Incorporated by reference to Fig. 7, first film transistor T1 is controlled in voltage data signal memory phase t21, scanning signal Scan
And third thin film transistor (TFT) T3 conducting, luminous signal EM control the 4th thin film transistor (TFT) T4 cut-off, and first switch K1 is closed, and second
Switch K2 is disconnected, and detecting module 30 transmits the second thin film transistor (TFT) T2 threshold voltage data to source electrode driver 20, source drive
Source electrode of the third thin film transistor (TFT) T3 of the closed first switch K1 of device 20, cabling 10 and conducting to the second thin film transistor (TFT) T2
And the difference Vdata-Vth of second end the write-in voltage data signal and the second thin film transistor (TFT) T2 threshold voltage of capacitor C1,
And the grid and capacitor C1 of the second thin film transistor (TFT) T2 is written in first film transistor T1 of the power supply positive voltage OVDD through being connected
First end, the gate-source voltage difference namely capacitor C1 voltage difference of the two ends of the second thin film transistor (TFT) T2 is OVDD- (Vdata- at this time
Vth) i.e. OVDD-Vdata+Vth.In this stage, since the 4th thin film transistor (TFT) T4 ends, Organic Light Emitting Diode D1 is not sent out
Light.
Specifically, referring to Fig. 3, in voltage data signal memory phase t21, scanning signal Scan is high potential control the
One thin film transistor (TFT) T1 and third thin film transistor (TFT) T3 conducting, luminous signal EM are that low potential controls the 4th thin film transistor (TFT) T4 sections
Only.
Incorporated by reference to Fig. 8, in luminescence display stage t22, scanning signal Scan controls first film transistor T1 and third is thin
Film transistor T3 cut-off, luminous signal EM control the 4th thin film transistor (TFT) T4 conducting, and first switch K1 is disconnected, and second switch K2 is disconnected
It opens, due to the memory action of capacitor C1, the second thin film transistor (TFT) T2 gate-source voltage difference keeps OVDD-Vdata+Vth, You Jifa
Optical diode D1 shines.According to the formula for the electric current for flowing through Organic Light Emitting Diode:
I=K (Vgs-Vth)2；
Wherein, I is the electric current for flowing through Organic Light Emitting Diode D1, and K is driving thin film transistor (TFT) namely the second film crystal
The characterisitic parameter of pipe T2, Vgs are to drive the gate-source voltage of thin film transistor (TFT) namely the second thin film transistor (TFT) T2 poor, and at this time the
The source grid voltage difference of two thin film transistor (TFT) T2 is OVDD-Vdata+Vth, therefore I=K (Vgs-Vth)2=K (OVDD-Vdata
+Vth-Vth)2=K (OVDD-Vdata)2, it is seen that Organic Light Emitting Diode D1 flows through the Organic Light Emitting Diode D1 when shining
Electric current it is unrelated with the threshold voltage of the second thin film transistor (TFT) T2, be able to solve and led by driving thin film transistor (TFT) threshold voltage shift
The unstable problem of the electric current for flowing through Organic Light Emitting Diode caused, keeps the light emission luminance of Organic Light Emitting Diode uniform, improves
The uniformity of display.
Specifically, referring to Fig. 3, in luminescence display stage t22, scanning signal Scan is that low potential controls the first film crystalline substance
Body pipe T1 and third thin film transistor (TFT) T3 cut-off, luminous signal EM are that high potential controls the 4th thin film transistor (TFT) T4 conducting.
It should be noted that OLED pixel driving circuit of the invention uses the framework of 4T1C, it can be brilliant to driving film
The threshold voltage of body pipe namely the second thin film transistor (TFT) T2 compensate, and make electric current and the driving of flowing through Organic Light Emitting Diode D1
The threshold voltage of thin film transistor (TFT) is unrelated, improves the uniformity of display, and at the same time, the present invention is by setting cabling 10 in difference
Moment transmits reference voltage Vref, the source voltage of the second thin film transistor (TFT) T2 and voltage data signal and the second film respectively
The difference Vdata-Vth of transistor T2 threshold voltage also carries out data line in existing pixel-driving circuit and sense wire
It shares, to be greatly saved the space of cabling, is conducive to the light-emitting area for improving pixel, reduces parasitic capacitance, promoted and produced
The quality of product.
Referring to Fig. 4, based on the same inventive concept, the present invention also provides a kind of OLED pixel driving methods, including such as
Lower step:
Step S1, above-mentioned OLED pixel driving circuit is provided.No longer the structure of OLED pixel driving circuit is done herein
Repeatability description.
Step S2, referring to Fig. 5, into threshold voltage memory phase t11.
Scanning signal Scan controls first film transistor T1 and third thin film transistor (TFT) T3 conducting, luminous signal EM control
4th thin film transistor (TFT) T4 cut-off, first switch K1 closure, second switch K2 disconnect, power supply positive voltage OVDD through being connected first
The grid of the second thin film transistor (TFT) T2, the closed first switch K1 of source electrode driver 20, cabling 10 is written in thin film transistor (TFT) T1
And initialization voltage Vref is written to the source electrode of the second thin film transistor (TFT) T2 in the third thin film transistor (TFT) T3 of conducting, at this point, power supply
Positive voltage OVDD charges to the source electrode of the second thin film transistor (TFT) T2, so that the source voltage of the second thin film transistor (TFT) T2 is continuous
Rise, until the source voltage of the second thin film transistor (TFT) T2 is equal to power supply positive voltage OVDD and the second thin film transistor (TFT) T2 threshold value electricity
The difference of pressure is simultaneously stored to the second end of capacitor C1.In this stage, since the 4th thin film transistor (TFT) T4 ends, organic light-emitting diodes
Pipe D1 does not shine.
Specifically, referring to Fig. 3, in the step S2, scanning signal Scan is that high potential controls first film transistor
T1 and third thin film transistor (TFT) T3 conducting, luminous signal EM are that low potential controls the 4th thin film transistor (TFT) T4 cut-off.
Step S3, referring to Fig. 6, into threshold voltage reconnaissance phase t12.
Scanning signal Scan controls first film transistor T1 and third thin film transistor (TFT) T3 conducting, luminous signal EM control
4th thin film transistor (TFT) T4 cut-off, first switch K1 are disconnected, second switch K2 closure, the closed second switch of detecting module 30
The source voltage that the third thin film transistor (TFT) T3 of K2, cabling 10 and conducting detect the second thin film transistor (TFT) T2 obtains the second film crystalline substance
Body pipe T2 threshold voltage data.In this stage, since the 4th thin film transistor (TFT) T4 ends, Organic Light Emitting Diode D1 does not shine.
Specifically, in the step S3, the source voltage that the detecting module 30 detects the second thin film transistor (TFT) T2 is obtained
The detailed process of second thin film transistor (TFT) T2 threshold voltage data are as follows: detecting module 30 detects the source electrode of the second thin film transistor (TFT) T2
Voltage is simultaneously converted, and the difference data of power supply positive voltage OVDD and the second thin film transistor (TFT) T2 threshold voltage are obtained, then sharp
The difference of power supply positive voltage OVDD and the second thin film transistor (TFT) T2 threshold voltage are subtracted with preset power supply positive voltage OVDD data
Data obtain the second thin film transistor (TFT) T2 threshold voltage data.
Specifically, referring to Fig. 3, in the step S3, scanning signal Scan is that high potential controls first film transistor
T1 and third thin film transistor (TFT) T3 conducting, luminous signal EM are that low potential controls the 4th thin film transistor (TFT) T4 cut-off.
Step S4, referring to FIG. 7, into voltage data signal memory phase t21.
Scanning signal Scan controls first film transistor T1 and third thin film transistor (TFT) T3 conducting, luminous signal EM control
4th thin film transistor (TFT) T4 cut-off, first switch K1 closure, second switch K2 are disconnected, and detecting module 30 transmits the second film crystal
Pipe T2 threshold voltage data is to source electrode driver 20, the closed first switch K1 of source electrode driver 20, cabling 10 and conducting
Source electrode from third thin film transistor (TFT) T3 to the second thin film transistor (TFT) T2 and capacitor C1 second end write-in voltage data signal with
The difference Vdata-Vth of second thin film transistor (TFT) T2 threshold voltage, and the first film crystal of the power supply positive voltage OVDD through being connected
The grid of the second thin film transistor (TFT) T2 and the first end of capacitor C1 is written in pipe T1, at this time the grid source electrode electricity of the second thin film transistor (TFT) T2
Pressure difference namely capacitor C1 voltage difference of the two ends are OVDD- (Vdata-Vth) i.e. OVDD-Vdata+Vth.In this stage, due to the 4th
Thin film transistor (TFT) T4 cut-off, Organic Light Emitting Diode D1 do not shine.
Specifically, referring to Fig. 3, in the step S4, scanning signal Scan is that high potential controls first film transistor
T1 and third thin film transistor (TFT) T3 conducting, luminous signal EM are that low potential controls the 4th thin film transistor (TFT) T4 cut-off.
Step S5, referring to Fig. 8, into luminescence display stage t22.
Scanning signal Scan controls first film transistor T1 and third thin film transistor (TFT) T3 cut-off, luminous signal EM control
4th thin film transistor (TFT) T4 conducting, first switch K1 are disconnected, and second switch K2 is disconnected, due to the memory action of capacitor C1, second
Thin film transistor (TFT) T2 gate-source voltage difference keeps OVDD-Vdata+Vth, Organic Light Emitting Diode D1 to shine.It is organic according to flowing through
The formula of the electric current of light emitting diode:
I=K (Vgs-Vth)2；
Wherein, I is the electric current for flowing through Organic Light Emitting Diode D1, and K is driving thin film transistor (TFT) namely the second film crystal
The characterisitic parameter of pipe T2, Vgs are to drive the gate-source voltage of thin film transistor (TFT) namely the second thin film transistor (TFT) T2 poor, and at this time the
The source grid voltage difference of two thin film transistor (TFT) T2 is OVDD-Vdata+Vth, therefore I=K (Vgs-Vth)2=K (OVDD-Vdata
+Vth-Vth)2=K (OVDD-Vdata)2, it is seen that Organic Light Emitting Diode D1 flows through the Organic Light Emitting Diode D1 when shining
Electric current it is unrelated with the threshold voltage of the second thin film transistor (TFT) T2, be able to solve and led by driving thin film transistor (TFT) threshold voltage shift
The unstable problem of the electric current for flowing through Organic Light Emitting Diode caused, keeps the light emission luminance of Organic Light Emitting Diode uniform, improves
The uniformity of display.
Specifically, referring to Fig. 3, in the step S5, scanning signal Scan is that low potential controls first film transistor
T1 and third thin film transistor (TFT) T3 cut-off, luminous signal EM are that high potential controls the 4th thin film transistor (TFT) T4 conducting.
It should be noted that OLED pixel driving method of the invention can be to driving thin film transistor (TFT) namely the second film
The threshold voltage of transistor T2 compensates, and makes the threshold value of the electric current for flowing through Organic Light Emitting Diode D1 and driving thin film transistor (TFT)
Voltage is unrelated, improves the uniformity of display, and at the same time, the present invention transmits reference in different moments by the way that cabling 10 is arranged respectively
Voltage Vref, the source voltage of the second thin film transistor (TFT) T2 and voltage data signal and the second thin film transistor (TFT) T2 threshold voltage
Difference Vdata-Vth, also i.e. data line and sense wire in existing pixel-driving circuit are shared, to save significantly
The space for having saved cabling is conducive to the light-emitting area for improving pixel, reduces parasitic capacitance, promote the quality of product.
In conclusion OLED pixel driving circuit of the invention uses the framework of 4T1C, and using a cabling in difference
Moment, specific control sequential of arranging in pairs or groups can be to the threshold voltage of driving thin film transistor (TFT) respectively as data line and sense wire
It compensates, keeps the electric current for flowing through Organic Light Emitting Diode unrelated with the driving threshold voltage of thin film transistor (TFT), improve display
Uniformity, while the space of cabling is effectively saved, be conducive to the light-emitting area for improving pixel, reduce parasitic capacitance, is promoted and produced
The quality of product.OLED pixel driving method of the invention can compensate the threshold voltage of driving thin film transistor (TFT), and have
Conducive to the light-emitting area for improving pixel, parasitic capacitance is reduced.
The above for those of ordinary skill in the art can according to the technique and scheme of the present invention and technology
Other various corresponding changes and modifications are made in design, and all these change and modification all should belong to the claims in the present invention
Protection scope.
Claims (10)
1. a kind of OLED pixel driving circuit, which is characterized in that including first film transistor (T1), the second thin film transistor (TFT)
(T2), third thin film transistor (TFT) (T3), the 4th thin film transistor (TFT) (T4), capacitor (C1), Organic Light Emitting Diode (D1), cabling
(10), first switch (K1), second switch (K2), source electrode driver (20) and detecting module (30)；
The grid of the first film transistor (T1) accesses scanning signal (Scan), drain electrode access supply voltage (OVDD) and electricity
Property connection the second thin film transistor (TFT) (T2) drain electrode, source electrode be electrically connected the second thin film transistor (TFT) (T2) grid；Described second
The source electrode of thin film transistor (TFT) (T2) is electrically connected the source electrode of the 4th thin film transistor (TFT) (T4)；The third thin film transistor (TFT) (T3)
Grid accesses scanning signal (Scan), and source electrode is electrically connected cabling (10), and drain electrode is electrically connected the second thin film transistor (TFT) (T2)
Source electrode；The grid of 4th thin film transistor (TFT) (T4) accesses luminous signal (EM), and drain electrode is electrically connected organic light emitting diode
(D1) anode；The first end and second end of the capacitor (C1) be electrically connected the second thin film transistor (TFT) (T2) grid and
Source electrode；The cathode of the Organic Light Emitting Diode (D1) accesses power supply negative voltage (OVSS)；The first of the first switch (K1)
End is electrically connected cabling (10), and second end is electrically connected source electrode driver (20)；The first end of the second switch (K2) is electrical
It connects cabling (10), second end is electrically connected detecting module (30)；The detecting module (30) is electrically connected the source drive
Device (20).
2. OLED pixel driving circuit as described in claim 1, which is characterized in that the work of the OLED pixel driving circuit
State includes sensing stage (t1) and display stage (t2)；
The sensing stage (t1) includes threshold voltage memory phase (t11) and threshold voltage reconnaissance phase (t12)；
At threshold voltage memory phase (t11), scanning signal (Scan) controls first film transistor (T1) and third film is brilliant
Body pipe (T3) conducting, luminous signal (EM) control the cut-off of the 4th thin film transistor (TFT) (T4), first switch (K1) closure, second switch
(K2) it disconnects, the grid of the second thin film transistor (TFT) (T2) is written in power supply positive voltage (OVDD), and source electrode driver (20) is thin to second
Initialization voltage (Vref) is written in the source electrode of film transistor (T2), and the source voltage of the second thin film transistor (TFT) (T2) constantly rises directly
To equal than the difference of power supply positive voltage (OVDD) and the second thin film transistor (TFT) (T2) threshold voltage；
At threshold voltage reconnaissance phase (t12), scanning signal (Scan) controls first film transistor (T1) and third film is brilliant
Body pipe (T3) conducting, luminous signal (EM) control the cut-off of the 4th thin film transistor (TFT) (T4), and first switch (K1) disconnects, second switch
(K2) it is closed, the source voltage of detecting module (30) detecting the second thin film transistor (TFT) (T2) obtains the second thin film transistor (TFT) (T2) threshold
Threshold voltage data；
The display stage (t2) includes voltage data signal memory phase (t21) and luminescence display stage (t22)；
At voltage data signal memory phase (t21), scanning signal (Scan) controls first film transistor (T1) and third is thin
Film transistor (T3) conducting, luminous signal (EM) control the cut-off of the 4th thin film transistor (TFT) (T4), and first switch (K1) is closed, and second
It switchs (K2) to disconnect, detecting module (30) transmission the second thin film transistor (TFT) (T2) threshold voltage data to source electrode driver (20),
Voltage data signal and the second thin film transistor (TFT) (T2) is written to the source electrode of the second thin film transistor (TFT) (T2) in source electrode driver (20)
The difference (Vdata-Vth) of threshold voltage；
At luminescence display stage (t22), scanning signal (Scan) controls first film transistor (T1) and third thin film transistor (TFT)
(T3) end, luminous signal (EM) controls the conducting of the 4th thin film transistor (TFT) (T4), and first switch (K1) disconnects, second switch (K2)
It disconnects, Organic Light Emitting Diode (D1) shines.
3. OLED pixel driving circuit as described in claim 1, which is characterized in that at threshold voltage memory phase (t11), sweep
Retouching signal (Scan) is high potential, and luminous signal (EM) is low potential；
At threshold voltage reconnaissance phase (t12), scanning signal (Scan) is high potential, and luminous signal (EM) is low potential；
At voltage data signal memory phase (t21), scanning signal (Scan) is high potential, and luminous signal (EM) is low potential；
At luminescence display stage (t22), scanning signal (Scan) is low potential, and luminous signal (EM) is high potential.
4. OLED pixel driving circuit as described in claim 1, which is characterized in that the cabling (10) includes the first sub- cabling
(11) and the second sub- cabling (12)；One end of the first sub- cabling (11) is electrically connected the first end of first switch (K1), separately
One end is electrically connected one end of the second sub- cabling (12)；The other end of the second sub- cabling (12) is electrically connected second switch
(K2) first end；The source electrode of third thin film transistor (TFT) (T3) is electrically connected the other end of the first sub- cabling (11).
5. OLED pixel driving circuit as described in claim 1, which is characterized in that the detecting module (30) is analog-to-digital conversion
Device (ADC).
6. OLED pixel driving circuit as described in claim 1, which is characterized in that detecting module (30) detecting second is thin
The source voltage of film transistor (T2) obtains the detailed process of the second thin film transistor (TFT) (T2) threshold voltage data are as follows: detecting module
(30) it detects the source voltage of the second thin film transistor (TFT) (T2) and is converted, obtain power supply positive voltage (OVDD) and the second film
The difference data of transistor (T2) threshold voltage then subtracts power supply positive voltage using preset power supply positive voltage (OVDD) data
(OVDD) with the difference data of the second thin film transistor (TFT) (T2) threshold voltage, the second thin film transistor (TFT) (T2) threshold voltage number is obtained
According to.
7. a kind of OLED pixel driving method, which comprises the steps of:
Step S1, OLED pixel driving circuit as described in claim 1 is provided；
Step S2, into threshold voltage memory phase (t11)；
Scanning signal (Scan) controls first film transistor (T1) and third thin film transistor (TFT) (T3) conducting, luminous signal (EM)
The cut-off of the 4th thin film transistor (TFT) (T4), first switch (K1) closure are controlled, second switch (K2) disconnects, power supply positive voltage (OVDD)
The grid of the second thin film transistor (TFT) (T2) is written, source electrode driver (20) is initial to the write-in of the source electrode of the second thin film transistor (TFT) (T2)
Change voltage (Vref), the source voltage of the second thin film transistor (TFT) (T2) is increased continuously until equal to power supply positive voltage (OVDD) and the
The difference of two thin film transistor (TFT)s (T2) threshold voltage；
Step S3, into threshold voltage reconnaissance phase (t12)；
Scanning signal (Scan) controls first film transistor (T1) and third thin film transistor (TFT) (T3) conducting, luminous signal (EM)
The cut-off of the 4th thin film transistor (TFT) (T4) is controlled, first switch (K1) disconnects, second switch (K2) closure, detecting module (30) detecting
The source voltage of second thin film transistor (TFT) (T2) obtains the second thin film transistor (TFT) (T2) threshold voltage data；
Step S4, into voltage data signal memory phase (t21)；
Scanning signal (Scan) controls first film transistor (T1) and third thin film transistor (TFT) (T3) conducting, luminous signal (EM)
The cut-off of the 4th thin film transistor (TFT) (T4), first switch (K1) closure are controlled, second switch (K2) disconnects, detecting module (30) transmission
Second thin film transistor (TFT) (T2) threshold voltage data is to source electrode driver (20), and source electrode driver (20) is to the second thin film transistor (TFT)
(T2) difference of source electrode write-in voltage data signal and the second thin film transistor (TFT) (T2) threshold voltage；
Step S5, into luminescence display stage (t22)；
Scanning signal (Scan) controls first film transistor (T1) and third thin film transistor (TFT) (T3) cut-off, luminous signal (EM)
The conducting of the 4th thin film transistor (TFT) (T4) is controlled, first switch (K1) disconnects, and second switch (K2) disconnects, Organic Light Emitting Diode
(D1) it shines.
8. OLED pixel driving method as claimed in claim 7, which is characterized in that in the step S2, scanning signal
It (Scan) is high potential, luminous signal (EM) is low potential；
In the step S3, scanning signal (Scan) is high potential, and luminous signal (EM) is low potential；
In the step S4, scanning signal (Scan) is high potential, and luminous signal (EM) is low potential；
In the step S5, scanning signal (Scan) is low potential, and luminous signal (EM) is high potential.
9. OLED pixel driving method as claimed in claim 7, which is characterized in that the cabling (10) includes the first sub- cabling
(11) and the second sub- cabling (12)；One end of the first sub- cabling (11) is electrically connected the first end of first switch (K1), separately
One end is electrically connected one end of the second sub- cabling (12)；The other end of the second sub- cabling (12) is electrically connected second switch
(K2) first end；The source electrode of third thin film transistor (TFT) (T3) is electrically connected the other end of the first sub- cabling (11).
10. OLED pixel driving method as claimed in claim 7, which is characterized in that the detecting module (30) turns for modulus
Parallel operation (ADC)；
In the step S3, the source voltage of detecting module (30) detecting the second thin film transistor (TFT) (T2) obtains the second film
The detailed process of transistor (T2) threshold voltage data are as follows: detecting module (30) detects the source electrode electricity of the second thin film transistor (TFT) (T2)
It presses and is converted, obtain the difference data of power supply positive voltage (OVDD) Yu the second thin film transistor (TFT) (T2) threshold voltage, then
Power supply positive voltage (OVDD) and the second thin film transistor (TFT) (T2) threshold value electricity are subtracted using preset power supply positive voltage (OVDD) data
The difference data of pressure obtains the second thin film transistor (TFT) (T2) threshold voltage data.
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| CN201811096620.4A CN109192142A (en) | 2018-09-19 | 2018-09-19 | OLED pixel driving circuit and driving method |
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