CN109410835A - A kind of novel OLED drive - Google Patents
A kind of novel OLED drive Download PDFInfo
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- CN109410835A CN109410835A CN201811471867.XA CN201811471867A CN109410835A CN 109410835 A CN109410835 A CN 109410835A CN 201811471867 A CN201811471867 A CN 201811471867A CN 109410835 A CN109410835 A CN 109410835A
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- oled
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- film transistor
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- 239000010409 thin film Substances 0.000 claims abstract description 46
- 239000003990 capacitor Substances 0.000 claims abstract description 22
- 230000000694 effects Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 13
- 239000011159 matrix material Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 5
- 229920001621 AMOLED Polymers 0.000 description 4
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003760 hair shine Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
Classifications
-
- 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]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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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)
- Electroluminescent Light Sources (AREA)
Abstract
The present invention relates to a kind of novel OLED drives, including thin film transistor (TFT) T1, T2, T3, T4, T5, capacitor C1 and OLED；The control terminal of the thin film transistor (TFT) T1 is connected to n grades of scanning signals, and source is connected to operating voltage Vdata, and drain terminal is connected to one end of the control terminal of T2, the drain terminal of T5 and capacitor C1；The source of the thin film transistor (TFT) T2 is connected to the drain terminal of T4, and drain terminal is connected to the end B of capacitor C1；The control terminal of the thin film transistor (TFT) T3 is connected to n-1 grades of scanning signals, and source is connected to reference voltage Vref, and drain terminal is connected to the other end of capacitor C1 and the anode of OLED；The control terminal of the thin film transistor (TFT) T4 is connected to control signal Em, and source is connected to operating voltage VDD；The control terminal of the thin film transistor (TFT) T5 is connected to n-1 grades of scanning signals, and source is connected to operating voltage Vin；The minus earth of the OLED.It can overcome simultaneously and cause drive current variations because OLED and TFT electrically degenerates, to reach pixel compensation and the uniform effect of panel luminance.
Description
Technical field
The present invention relates to the technical field of Organic Light Emitting Diode, in particular to a kind of novel OLED drive.
Background technique
Organic Light Emitting Diode (Organic Light Emitting Diode, OLED) can be divided into passively according to driving method
Formula matrix driving (Passive Matrix OLED, PMOLED) and active-matrix driving (Active Matrix OLED,
AMOLED) two kinds.Wherein, PMOLED is not shone when data are not written, is only shone in data address period.This driving
Mode structure is simple, cost is relatively low, is easier to design, and is primarily adapted for use in the display of small-medium size.
Finally, AM represents Active Matrix, it is to refer to each OLED picture for Passive Matrix
The driving method of element.In Passive Matrix, the control of each pixel is realized by a complicated electrode network
, to realize the charge and discharge of some pixel, on the whole, the control mode relative velocity of Passive Matrix is slower, control
Precision processed is also slightly lower.And it is different from Passive Matrix, Active Matrix be then installed additional on each LED TFT and
Capacitor layers, in this way when a certain column of certain a line are powered that pixel for activating intersection, the capacitor layers in pixel can be brushed twice
Charged state is kept between new, is more rapidly controlled with more accurate pixel light emission to realize.
Since the voltage VDD in AMOLED panel links together between each pixel, when driving shines, voltage
Electric current is had on VDD to flow through.In view of VDD metal wire itself has impedance, pressure drop presence is had, the VDD of each pixel is caused
It will appear difference, lead between different pixels that there are current differences.In this way, the electric current for flowing through OLED is different, it is generated bright
Degree is also different, and then AMOLED panel is uneven.In addition, due to the influence of processing procedure, the threshold of the thin film transistor (TFT) in each pixel
Threshold voltage is all different, even if providing the voltage Vdata of identical numerical value, generated electric current still suffers from difference, this also will
Cause panel uneven.In addition, if being compensated using pixel compensation circuit to above-mentioned voltage, the meeting again of most of compensation circuit
It is too short and influence compensation effect to be limited to sweep time.
This mode is solved in small size generally by the way of OLED internal compensation circuit, but benefit typically now
TFT negative sense drift conditions can not be compensated by repaying circuit, and such compensation circuit occurs as soon as limitation.
Summary of the invention
For this reason, it may be necessary to provide a kind of novel OLED drive, solving existing OLED compensation circuit, can not to compensate TFT negative
Caused by deteriorating to drift conditions and because of OLED the problem of curent change.
To achieve the above object, a kind of novel OLED drive is inventor provided, including thin film transistor (TFT) T1, T2,
T3, T4, T5, capacitor C1 and OLED；
The control terminal of the thin film transistor (TFT) T1 is connected to n grades of scanning signals, and source is connected to operating voltage Vdata, leakage
End is connected to one end of the control terminal of T2, the drain terminal of T5 and capacitor C1；
The source of the thin film transistor (TFT) T2 is connected to the drain terminal of T4, and drain terminal is connected to the end B of capacitor C1；
The control terminal of the thin film transistor (TFT) T3 is connected to n-1 grades of scanning signals, and source is connected to reference voltage Vref, leakage
End is connected to the other end of capacitor C1 and the anode of OLED；
The control terminal of the thin film transistor (TFT) T4 is connected to control signal Em, and source is connected to operating voltage VDD；
The control terminal of the thin film transistor (TFT) T5 is connected to n-1 grades of scanning signals, and source is connected to operating voltage Vin；
The minus earth of the OLED.
It advanced optimizes, described thin film transistor (TFT) T1, T2, T3, T4, T5 are N type junction structure.
It is different from the prior art, above-mentioned technical proposal, driving circuit uses the five of thin film transistor (TFT) T1, T2, T3, T4, T5
A switch, a capacitor C1 and an OLED constitute 5T1C framework, so that the time sequences of the driving circuit are once divided into
Reseting stage, compensated stage, data write phase and light emitting phase, and since thin film transistor (TFT) T2 writes in reseting stage and data
Entering the stage is in off state, and OLED can't shine, and extend the service life of OLED.And thin film transistor (TFT) T2 is being sent out
Light is in opening state, and the electric current for flowing through OLED is not only unrelated with the threshold voltage of thin film transistor (TFT) T1, but also and OLED
Device driving voltage (anode voltage) is unrelated, it is thus possible to while overcoming and causing driving electricity because OLED and TFT electrically degenerates
Rheology, to reach pixel compensation and the uniform effect of panel luminance.
Detailed description of the invention
Fig. 1 is a kind of circuit diagram of novel OLED drive described in specific embodiment；
Fig. 2 is the time diagram of novel OLED drive described in specific embodiment；
Fig. 3 is circuit diagram of the novel OLED drive described in specific embodiment in reseting stage t1；
Fig. 4 is circuit diagram of the novel OLED drive described in specific embodiment in compensated stage t2；
Fig. 5 is circuit diagram of the novel OLED drive described in specific embodiment in data write phase t3；
Fig. 6 is circuit diagram of the novel OLED drive described in specific embodiment in light emitting phase t4；
Fig. 7 is the OLED anode voltage variable quantity under the TFT Vth variation of the novel OLED drive of specific embodiment
Schematic diagram.
Specific embodiment
Technology contents, construction feature, the objects and the effects for detailed description technical solution, below in conjunction with specific reality
It applies example and attached drawing is cooperated to be explained in detail.
Referring to Fig. 1, novel OLED drive described in the present embodiment, including thin film transistor (TFT) T1, T2, T3, T4, T5,
Capacitor C1 and OLED；Wherein, described thin film transistor (TFT) T1, T2, T3, T4, T5 are N type junction structure.
The control terminal of the thin film transistor (TFT) T1 is connected to n grades of scanning signals, and source is connected to operating voltage Vdata, leakage
End is connected to one end of the control terminal of T2, the drain terminal of T5 and capacitor C1；
The source of the thin film transistor (TFT) T2 is connected to the drain terminal of T4, and drain terminal is connected to the end B of capacitor C1；
The control terminal of the thin film transistor (TFT) T3 is connected to n-1 grades of scanning signals, and source is connected to reference voltage Vref, leakage
End is connected to the other end of capacitor C1 and the anode of OLED；
The control terminal of the thin film transistor (TFT) T4 is connected to control signal Em, and source is connected to operating voltage VDD；
The control terminal of the thin film transistor (TFT) T5 is connected to n-1 grades of scanning signals, and source is connected to operating voltage Vin；
The minus earth of the OLED.
Driving circuit uses five switches, a capacitor C1 and an OLED structure of thin film transistor (TFT) T1, T2, T3, T4, T5
At 5T1C framework, so that the time sequences of the driving circuit are once divided into reseting stage, compensated stage, data write phase
And light emitting phase, and since thin film transistor (TFT) T2 in reseting stage and data write phase is in off state, OLED is not
It can shine, extend the service life of OLED.And thin film transistor (TFT) T2 is shining in opening state, flows through the electric current of OLED
It is not only unrelated with the threshold voltage of thin film transistor (TFT) T1 but also unrelated with OLED device driving voltage (anode voltage), thus
It can overcome simultaneously and cause drive current variations because OLED and TFT electrically degenerates, it is equal to reach pixel compensation and panel luminance
Even effect.Concrete principle is as follows:
Fig. 2 gives the time diagram of novel OLED drive described in the present embodiment, by the running of the driving circuit
Timing is once divided into four-stage, is respectively as follows: reseting stage t1, compensated stage t2, data write phase t3 and light emitting phase
t4.With specifically, in reseting stage t1, mainly resetting A and B point voltage；It is main to extract thin film transistor (TFT) T1 in compensated stage t2
VTh；In data write phase t3, mainly write-in data signals；And in light emitting phase t4, when driving OLED device,
The driving voltage (anode voltage) for extracting OLED realizes OLED device compensation.The process in specific each stage is as follows:
Circuit diagram of the novel OLED drive shown in Fig. 3 in reseting stage t1, reseting stage t1:scan (n-1)
Signal is high potential, and thin film transistor (TFT) T3 and T5 is fully open, and A point current potential is Vin at this time, and B point current potential is Vref, wherein
The Vth of Vini-Vref > TFT guarantees that thin film transistor (TFT) T2 can be opened, this stage completes the reset of A point and B point current potential.
Novel OLED drive shown in Fig. 4 compensated stage t2 circuit diagram, compensated stage t2:scan (n) and
Scan (n-1) low potential, Em are high potential, and thin film transistor (TFT) T2 and T4 are opened, and the current potential of A point is Vin, the current potential of B point at this time
It can change, when the voltage differences of A and B point are Vth, thin film transistor (TFT) T2 is closed, and the voltage of B point is Vini-Vth at this time；
At this time it may be noted that the compensation way can simultaneously thin film transistor (TFT) T2 positive and negative shift, such as work as thin film transistor (TFT) T2 Vth=-
When 1V, B point current potential can become Vin+1V at this time, if B, such as the Vth=1V of thin film transistor (TFT) T2, B point current potential is at this time
Vin-1V, the Vth for completing thin film transistor (TFT) T1 at this time are extracted.
Circuit diagram of the novel OLED drive shown in Fig. 5 in data write phase t3, data write phase t3: thin
Film transistor T1 is opened, and A point current potential becomes Vdata at this time, B point potential change be 1/K1* (Vdata-Vin)+Vin-Vth (because
C1 capacitive coupling), K1=C1/ (C1+COLED).
In the circuit diagram of light emitting phase t4, light emitting phase t4:T2 and T4 are beaten novel OLED drive shown in Fig. 6
Open, the potential change of each point is as follows at this time: since OLED is in light emitting phase at this time, B point current potential is OLED driving voltage V_
OLED, i.e. B:V_OLED；Because of capacitive coupling, therefore A point voltage becomes A:Vdata+VOLED- (1/K* (Vdata-Vin)+Vin-
Vth), the above results are to think that A point current potential is by 100% coupling effect of capacitor, i.e. capacitor C is outer without other parasitic capacitances at A point.
There is saturation region current formula Ioled=1/2*k* (VGS_T2-VTh)2It can obtain, the final driving current of OLED device are as follows: Ioled=1/
2K (Vdata-1/K1* (Vdata-Vin)+Vin) ^2 (K is parameter relevant to size, mobility of TFT etc.), IoledOnly
Have that data signals are related to reference voltage Vref, and it is unrelated with Vth_T1 and V_OLED；And then compensate the threshold value electricity of T1 transistor
Press display caused by the variation of elegant and OLED device driving voltage uneven.
The schematic diagram of OLED anode voltage variable quantity under the TFT Vth variation of novel OLED drive shown in Fig. 7, newly
The 5T1C structure that type OLED drive uses is compared with traditional 2T1C, the shadow of the drift of the Vth of TFT to the anode voltage of OLED
Sound is smaller.
It should be noted that being not intended to limit although the various embodiments described above have been described herein
Scope of patent protection of the invention.Therefore, it based on innovative idea of the invention, change that embodiment described herein is carried out and is repaired
Change, or using equivalent structure or equivalent flow shift made by description of the invention and accompanying drawing content, it directly or indirectly will be with
Upper technical solution is used in other related technical areas, is included within the scope of protection of the patent of the present invention.
Claims (2)
1. a kind of novel OLED drive, which is characterized in that including thin film transistor (TFT) T1, T2, T3, T4, T5, capacitor C1 and
OLED；
The control terminal of the thin film transistor (TFT) T1 is connected to n grades of scanning signals, and source is connected to operating voltage Vdata, and drain terminal connects
It is connected to one end of the control terminal of T2, the drain terminal of T5 and capacitor C1；
The source of the thin film transistor (TFT) T2 is connected to the drain terminal of T4, and drain terminal is connected to the end B of capacitor C1；
The control terminal of the thin film transistor (TFT) T3 is connected to n-1 grades of scanning signals, and source is connected to reference voltage Vref, and drain terminal connects
It is connected to the other end of capacitor C1 and the anode of OLED；
The control terminal of the thin film transistor (TFT) T4 is connected to control signal Em, and source is connected to operating voltage VDD；
The control terminal of the thin film transistor (TFT) T5 is connected to n-1 grades of scanning signals, and source is connected to operating voltage Vin；
The minus earth of the OLED.
2. novel OLED drive according to claim 1, which is characterized in that the thin film transistor (TFT) T1, T2, T3, T4,
T5 is N type junction structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811471867.XA CN109410835B (en) | 2018-12-04 | 2018-12-04 | Novel OLED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811471867.XA CN109410835B (en) | 2018-12-04 | 2018-12-04 | Novel OLED drive circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109410835A true CN109410835A (en) | 2019-03-01 |
| CN109410835B CN109410835B (en) | 2024-05-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811471867.XA Active CN109410835B (en) | 2018-12-04 | 2018-12-04 | Novel OLED drive circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110189705A (en) * | 2019-06-19 | 2019-08-30 | 京东方科技集团股份有限公司 | Pixel circuit, display panel and display equipment |
| CN110379369A (en) * | 2019-05-27 | 2019-10-25 | 福建华佳彩有限公司 | A kind of pixel compensation circuit and driving method |
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| CN102930822A (en) * | 2012-11-12 | 2013-02-13 | 京东方科技集团股份有限公司 | Pixel circuit and display device and driving method of pixel circuit |
| CN107731168A (en) * | 2017-11-06 | 2018-02-23 | 深圳市华星光电半导体显示技术有限公司 | OLED pixel drive circuit, OLED display panel and driving method |
| CN209133200U (en) * | 2018-12-04 | 2019-07-19 | 福建华佳彩有限公司 | A kind of novel OLED drive |
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2018
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Patent Citations (4)
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| KR20060113334A (en) * | 2005-04-29 | 2006-11-02 | 재단법인서울대학교산학협력재단 | Pixel structure using voltage programming-type for active matrix organic light emitting device |
| CN102930822A (en) * | 2012-11-12 | 2013-02-13 | 京东方科技集团股份有限公司 | Pixel circuit and display device and driving method of pixel circuit |
| CN107731168A (en) * | 2017-11-06 | 2018-02-23 | 深圳市华星光电半导体显示技术有限公司 | OLED pixel drive circuit, OLED display panel and driving method |
| CN209133200U (en) * | 2018-12-04 | 2019-07-19 | 福建华佳彩有限公司 | A kind of novel OLED drive |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110379369A (en) * | 2019-05-27 | 2019-10-25 | 福建华佳彩有限公司 | A kind of pixel compensation circuit and driving method |
| CN110189705A (en) * | 2019-06-19 | 2019-08-30 | 京东方科技集团股份有限公司 | Pixel circuit, display panel and display equipment |
| CN110189705B (en) * | 2019-06-19 | 2021-02-05 | 京东方科技集团股份有限公司 | Pixel circuit, display panel and display device |
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| CN109410835B (en) | 2024-05-10 |
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