CN101714333A - Organic light-emitting diode display and drive circuit thereof - Google Patents
Organic light-emitting diode display and drive circuit thereof Download PDFInfo
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- CN101714333A CN101714333A CN200910259417A CN200910259417A CN101714333A CN 101714333 A CN101714333 A CN 101714333A CN 200910259417 A CN200910259417 A CN 200910259417A CN 200910259417 A CN200910259417 A CN 200910259417A CN 101714333 A CN101714333 A CN 101714333A
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Abstract
The invention discloses an organic light-emitting diode display and a drive circuit thereof. The display comprises a grid electrode drive, a source electrode drive, a drain electrode drive and a plurality of pixels, wherein each pixel comprises an organic light-emitting diode, a first transistor, a second transistor, a third transistor, a fourth transistor and a capacitor; the grid electrode of the first transistor is coupled with a scanning signal, and the drain electrode of the first transistor is coupled with a data voltage; the grid electrode of the second transistor is coupled with the source electrode of the first transistor, and the source electrode of the second transistor is coupled with the organic light-emitting diode; the drain electrode of the third transistor is coupled with a voltage detection circuit, and the source electrode of the third transistor is coupled with the drain electrode of the second transistor; the grid electrode of the fourth transistor is coupled with a control signal, the drain electrode of the fourth transistor is coupled with a supply voltage, and the source electrode of the fourth transistor is coupled with the drain electrode of the second transistor; and both ends of the capacitor are respectively coupled with the drain electrode and the source electrode of the second transistor.
Description
Technical field
The present invention relates to a kind of organic light emitting diode display, the organic light emitting diode display and the driving circuit thereof of the critical voltage difference of outstanding reference and a kind of compensation transistor.
Background technology
Function advanced person's display gradually becomes the valuable feature of consumption electronic product now, Organic Light Emitting Diode (Organic Light Emitting Diodes wherein, OLED) be a kind of photoelectron conversion equipment, more and more receive the industry concern because of having advantages such as the restriction of no visual angle, low cost of manufacture and high briliancy.Organic light emitting diode display can be divided into active-matrix formula organic light emitting diode display according to the type of drive difference, and (Active Matrix Organic Light Emitting Diodes is AMOLED) with passive-matrix (PassiveMatrix) formula organic light emitting diode display.
See also Fig. 1, Fig. 1 be the Organic Light Emitting Diode 28 that illustrates prior art with and the circuit diagram of driving circuit 20.The driving circuit 20 of traditional active-matrix formula organic light emitting diode display comprises transistor 22,24 and electric capacity 26.Transistor 22 is to be used for being responsible for data to write storage switch as switching transistor, and transistor 24 then is responsible for the Control current size as driving transistors.Under the general situation, transistor 24 can continue to operate in the saturation region, therefore can be subjected to critical voltage (threshold voltage) Vth influence.Critical voltage Vth then can be because of the difference of manufacturing process or structure difference to some extent, or because cause the critical voltage of transistor 24 to rise because of the pressurization of electric capacity 26 for a long time.Because the output current Ids of transistor 24 equals (1/2) * K * (Vgs-Vth) 2, wherein K is that a constant and Vgs represent transistor gates-source electrode cross-pressure again.Because the variation of critical voltage Vth can directly have influence on the output current Ids of transistor 24, cause the brightness of Organic Light Emitting Diode 28 to produce uneven phenomenon because of output current Ids difference.For the variable effect that makes critical voltage reduces to minimum, the most rule of doing is to use the interior pixels circuit design to reach compensating action at present, and these interior pixels circuit all need use 5 even more transistor usually, but just comparatively complicated in the relative sequential control.
Summary of the invention
In view of this, the present invention is the driving circuit relevant for a kind of driving one Organic Light Emitting Diode, driving circuit can measure voltage or electric current, and be stored in the storer, via stored information each pixel is done correction, driving transistors in the compensation pixel improves the phenomenon of brightness irregularities because of the critical voltage skew that manufacturing process or catabiosis cause by this.
The present invention is relevant for a kind of display, and it comprises gate drivers, source electrode driver, gate drivers and a plurality of pixel.This gate drivers is used for producing one and scans signal.This source electrode driver is used for producing a data voltage.Each pixel packets contains Organic Light Emitting Diode, the first transistor, transistor seconds, the 3rd transistor, the 4th transistor and electric capacity.Organic Light Emitting Diode is used for producing light according to the electric current of the described Organic Light Emitting Diode of flowing through.The grid of the first transistor is coupled to this and scans signal, and its drain electrode is coupled to this data voltage.The grid of transistor seconds is coupled to the source electrode of this first transistor, and its source electrode is coupled to this Organic Light Emitting Diode.The 3rd transistorized grid is coupled to a control signal, and its drain electrode is coupled to one and detects potential circuit, and its source electrode is coupled to the drain electrode of this transistor seconds.The 4th transistorized grid is coupled to this control signal, and its drain electrode is coupled to a supply voltage, and its source electrode is coupled to the drain electrode of this transistor seconds.The two ends of this electric capacity are respectively coupled to the drain electrode and the source electrode of this transistor seconds.
The present invention is that it comprises the first transistor, transistor seconds, the 3rd transistor, the 4th transistor and electric capacity relevant for a kind of driving circuit of driving one Organic Light Emitting Diode.The grid of the first transistor is coupled to this and scans signal, and its drain electrode is coupled to this data voltage.The grid of transistor seconds is coupled to the source electrode of this first transistor, and its source electrode is coupled to this Organic Light Emitting Diode.The 3rd transistorized grid is coupled to a control signal, and its drain electrode is coupled to one and detects potential circuit, and its source electrode is coupled to the drain electrode of this transistor seconds.The 4th transistorized grid is coupled to this control signal, and its drain electrode is coupled to a supply voltage, and its source electrode is coupled to the drain electrode of this transistor seconds.The two ends of this electric capacity are respectively coupled to the drain electrode and the source electrode of this transistor seconds.
Under detecting pattern, detect transistorized critical voltage value according to the illustrated driving circuit of one embodiment of the invention, and will be stored in storer, and under display mode, drive Organic Light Emitting Diode and emit beam according to data voltage.But data voltage can be done the compensation of appropriateness according to the stored critical voltage of storer, so each pixel received data voltage all is the data voltage behind the transistorized critical voltage of considering in each pixel, so can avoid transistorized critical voltage because the critical voltage skew that causes because of manufacturing process or catabiosis, thereby improve the problem of brightness irregularities.
For foregoing of the present invention can be become apparent, preferred embodiment cited below particularly, and conjunction with figs. are described in detail below:
Description of drawings
Fig. 1 be the Organic Light Emitting Diode that illustrates prior art with and the circuit diagram of driving circuit;
Fig. 2 is the synoptic diagram of organic light emitting diode display of the present invention;
Fig. 3 be driving circuit of the present invention with and the synoptic diagram of the Organic Light Emitting Diode that drives;
Fig. 4 is the sequential chart of each signal under detecting pattern that driving circuit received of Fig. 3.
The main element symbol description:
10 organic light emitting diode display, 26 electric capacity
12 display panels, 14 gate drivers
16 source electrode drivers, 18 pixels
20 driving circuits, 22,24 transistors
40 driving circuits, 50 Organic Light Emitting Diodes
60 controllers, 70 storeies
80 detect potential circuit T1-T4 transistor
C electric capacity VDATA data voltage
VDetect detects voltage Gcomp control signal
Gn scans signal VDD, VSS supply voltage
Embodiment
Please refer to Fig. 2 and Fig. 3, Fig. 2 is the synoptic diagram of organic light emitting diode display 100 of the present invention, Fig. 3 be driving circuit 40 of the present invention with and the synoptic diagram of the Organic Light Emitting Diode 50 that drives.Organic light emitting diode display 10 comprises display panel 12, gate drivers (gate driver) 14, source electrode driver (source driver) 16, detects potential circuit 80, controller 60 and storer 70.Display panel 12 comprises a plurality of pixels 18, and each pixel 18 comprises an one drive circuit 40 and an Organic Light Emitting Diode 50.Driving circuit 40 comprises the first transistor T1, transistor seconds T2, the 3rd transistor T 3, the 4th transistor T 4 and capacitor C.The grid of the first transistor T1 is coupled to gate drivers 14 and scans signal Gn with reception, and its drain electrode is coupled to source electrode driver 16 to receive data voltage V
DATAThe grid of transistor seconds T2 is coupled to the source electrode of the first transistor T1, and its source electrode is coupled to Organic Light Emitting Diode 50.The grid of the 3rd transistor T 3 is coupled to the control signal Gcomp that controller 60 is sent, and its drain electrode is coupled to and detects potential circuit 80 to receive detection voltage Vdetct, and its source electrode is coupled to the drain electrode of transistor seconds T2.The grid of the 4th transistor T 4 is coupled to control signal Gcomp, and its drain electrode is coupled to supply voltage VDD, and its source electrode is coupled to the drain electrode of transistor seconds T2.The two ends of capacitor C are respectively coupled to drain electrode and the source electrode of transistor seconds T2.
See also Fig. 4, Fig. 4 is the sequential chart of each signal under detecting pattern that the driving circuit 40 of Fig. 3 is received.The operation of driving circuit 40 is divided into two kinds of patterns, and a kind of is detecting pattern, and another kind is a display mode.Under detecting pattern, driving circuit 40 can detect the critical voltage of transistor T 2, and the critical voltage after will detecting is stored in the storer 70.And under display mode, driving circuit 40 can drive Organic Light Emitting Diode 50, makes Organic Light Emitting Diode 50 according to data voltage V
DATAEmit beam.But data voltage V
DATACan do the compensation of appropriateness according to storer 70 stored critical voltages, so each pixel 18 received data voltage V
DATAAll be the data voltage V that considers behind the critical voltage Vth of the transistor T 2 in each pixel 18
DATACritical voltage Vth for detection transistor T 2 that can be correct, under detecting pattern, at time point t1 during the t2 (phase one), transistor T 4 meeting conductings because control signal Gcomp starts, again because transistor T 1 is in the accurate position of low-voltage, so capacitor C can be promoted to supply voltage VDD with storing current potential., then the capacitor C discharge is closed up to transistor T 2 during the t3 (subordinate phase) at time point t2, at this moment, the current potential that capacitor C stores is V just
DATA+ Vth.After time point t3 (phase III), transistor T 1, T4 are because of scanning signal Gn and be in the accurate position of high voltage and control signal Gcomp is in the accurate not conducting of position of low-voltage, but transistor T 3 is opened conducting, make detect potential circuit 80 can be according to detecting voltage V
DetectDetect the current potential V that capacitor C stores
DATA+ Vth also is stored in the storer 70.
When having arrived display mode, the control signal Gcomp that controller 60 produces is in the accurate position of low-voltage, and transistor T 3 is to close not conducting.Gate drivers 14 makes the transistor T 1 of each row pixel 18 open in regular turn every a fixed intervals output scanning signal Gn simultaneously, the current potential V that source electrode driver 16 meetings are simultaneously noted down according to storer 70
DATA+ Vth calculates and produces corresponding data voltage
V DATA, again with data voltage V
DATABe sent to transistor T 2 via transistor T 1.Because the output current Ids of transistor T 2 equals (1/2) * K * (Vgs-Vth) 2, wherein K is lock-source electrode cross-pressure that a constant and Vgs represent transistor T 2, thus the output current Ids of transistor T 2 be substantially equal to (1/2) * K * (
VDATA-VSS-Vth) 2.That is to say, consider the data voltage of adjusting behind the critical voltage Vth of transistor T 2
V DATACan be so that the output current Ids of transistor T 2 be substantially equal to (1/2) * K * (V
DATA) 2.At this moment, under display mode, the critical voltage Vth of transistor T 2 can influence the variation of output current Ids hardly, so Organic Light Emitting Diode 50 can send the light of different brightness according to the output current Ids that flows through.Storer 70 note that because can store the critical voltage Vth and the data voltage V of the transistor T 2 in each pixel 18
DATAVariation, so data voltage after the compensation of the last output of source electrode driver 16
V DATAAfter the corresponding pixel 18 of input, the difference of the critical voltage Vth of respective transistors T2 can be offseted again, thus light that final Organic Light Emitting Diode 50 is sent and GTG only with raw data voltage V
DATAUnanimity is so the uneven problem of conventional display panels 12 display brightness can be improved.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limiting the present invention, anyly has the knack of this skill person, without departing from the spirit and scope of the present invention; when can doing various changes and modification, thus protection scope of the present invention when with claim the person of being defined be as the criterion.
Claims (10)
1. a display is characterized in that, described display comprises:
Gate drivers is used for producing one and scans signal;
Source electrode driver is used for producing a data voltage; And
A plurality of pixels, each pixel comprises:
Organic Light Emitting Diode is used for producing light according to the electric current of the described Organic Light Emitting Diode of flowing through;
The first transistor, its grid are coupled to the described signal that scans, and its drain electrode is coupled to described data voltage;
Transistor seconds, its grid is coupled to the source electrode of described the first transistor, and its source electrode is coupled to described Organic Light Emitting Diode;
The 3rd transistor, its grid is coupled to a control signal, and its drain electrode is coupled to one and detects potential circuit, and its source electrode is coupled to the drain electrode of described transistor seconds;
The 4th transistor, its grid is coupled to described control signal, and its drain electrode is coupled to a supply voltage, and its source electrode is coupled to the drain electrode of described transistor seconds; With
One electric capacity, its two ends are respectively coupled to described transistor seconds transistor drain and source electrode.
2. display as claimed in claim 1, it is characterized in that, when described display is in a display mode, described the 3rd transistor transistor is closed, described the first transistor transistor is opened, and makes described Organic Light Emitting Diode produce the electric current of the described Organic Light Emitting Diode of flowing through to emit beam according to described data voltage.
3. display as claimed in claim 2, it is characterized in that, when described display is in the phase one of a detection detecting pattern, described the first transistor transistor and the 3rd transistor are closed, described the 4th transistor is opened, described electric capacity stores described supply voltage, when described display is in the subordinate phase of described detection detecting pattern, described the first transistor and described the 3rd transistor are opened, described the 4th transistor is closed, described capacitor discharge to described data voltage and transistorized critical voltage with.
4. display as claimed in claim 2 is characterized in that it comprises a storer in addition, and wherein when described display was in the phase III of described detection detecting pattern, described storer stored described critical voltage via described the 3rd transistor.
5. display as claimed in claim 4 is characterized in that, when described source electrode driver was in described display mode in described display, the described critical voltage of the described memory storage of foundation calculated described data voltage.
6. driving circuit that drives an Organic Light Emitting Diode is characterized in that described driving circuit comprises:
The first transistor, its grid is coupled to one and scans signal, and its drain electrode is coupled to a data voltage;
Transistor seconds, its grid is coupled to the source electrode of described the first transistor, and its source electrode is coupled to described Organic Light Emitting Diode;
The 3rd transistor, its grid is coupled to a control signal, and its drain electrode is coupled to one and detects potential circuit, and its source electrode is coupled to the drain electrode of described transistor seconds;
The 4th transistor, its grid is coupled to described control signal, and its drain electrode is coupled to a supply voltage, and its source electrode is coupled to the drain electrode of described transistor seconds; And
Electric capacity, its two ends are respectively coupled to the drain electrode and the source electrode of described transistor seconds.
7. driving circuit as claimed in claim 6, it is characterized in that, when being in a display mode, described the 3rd transistor is closed, described the first transistor is opened, and makes described Organic Light Emitting Diode produce the electric current of the described Organic Light Emitting Diode of flowing through to emit beam according to described data voltage.
8. as driving circuit as claimed in claim 6, it is characterized in that, when being in the phase one of a detecting pattern, described the first transistor and described the 3rd transistor are closed, described the 4th transistor is opened, described electric capacity stores described supply voltage, when described display is in the subordinate phase of described detecting pattern, described the first transistor and described the 3rd transistor are opened, described the 4th transistor is closed, described capacitor discharge to described data voltage and transistorized critical voltage with.
9. as driving circuit as claimed in claim 7, it is characterized in that, when being in the phase III of described detecting pattern, store described critical voltage to a storer via described the 3rd transistor.
10. as driving circuit as claimed in claim 9, it is characterized in that when being in described display mode, described Organic Light Emitting Diode calculates described data voltage generation light according to the described critical voltage of described memory storage.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009102594179A CN101714333B (en) | 2009-12-18 | 2009-12-18 | Organic light-emitting diode display and drive circuit thereof |
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| CN2009102594179A CN101714333B (en) | 2009-12-18 | 2009-12-18 | Organic light-emitting diode display and drive circuit thereof |
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| CN101714333A true CN101714333A (en) | 2010-05-26 |
| CN101714333B CN101714333B (en) | 2012-05-23 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102222465A (en) * | 2011-03-17 | 2011-10-19 | 友达光电股份有限公司 | Organic light emitting display device with threshold voltage compensation mechanism and driving method thereof |
| CN103854609A (en) * | 2012-12-04 | 2014-06-11 | 乐金显示有限公司 | Pixel circuit, driving method thereof, and organic light emitting display device using the same |
| CN104835469A (en) * | 2015-02-24 | 2015-08-12 | 友达光电股份有限公司 | Display device and operation method thereof |
| CN108877646A (en) * | 2018-07-26 | 2018-11-23 | 厦门凌阳华芯科技有限公司 | A kind of display circuit and display |
| CN108986738A (en) * | 2018-07-18 | 2018-12-11 | 友达光电股份有限公司 | Pixel structure |
| CN110544455A (en) * | 2019-02-27 | 2019-12-06 | 友达光电股份有限公司 | pixel circuit and driving method thereof |
| CN114333665A (en) * | 2021-09-24 | 2022-04-12 | 友达光电股份有限公司 | Light emitting diode driving circuit |
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| CN1316443C (en) * | 2003-03-24 | 2007-05-16 | 友达光电股份有限公司 | Electric current driver active matrix organic light-emitting diode pixel circuit and driving method |
| CN100346387C (en) * | 2004-09-08 | 2007-10-31 | 友达光电股份有限公司 | Organic light-emitting display and its display unit |
| JP5224702B2 (en) * | 2006-03-13 | 2013-07-03 | キヤノン株式会社 | Pixel circuit and image display device having the pixel circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102222465B (en) * | 2011-03-17 | 2013-03-13 | 友达光电股份有限公司 | Organic light emitting display device with threshold voltage compensation mechanism and driving method thereof |
| CN102222465A (en) * | 2011-03-17 | 2011-10-19 | 友达光电股份有限公司 | Organic light emitting display device with threshold voltage compensation mechanism and driving method thereof |
| CN103854609A (en) * | 2012-12-04 | 2014-06-11 | 乐金显示有限公司 | Pixel circuit, driving method thereof, and organic light emitting display device using the same |
| CN103854609B (en) * | 2012-12-04 | 2016-04-27 | 乐金显示有限公司 | Image element circuit, its driving method and use its organic light-emitting display device |
| US9349318B2 (en) | 2012-12-04 | 2016-05-24 | Lg Display Co., Ltd. | Pixel circuit, driving method for threshold voltage compensation, and organic light emitting display device using the same |
| CN104835469A (en) * | 2015-02-24 | 2015-08-12 | 友达光电股份有限公司 | Display device and operation method thereof |
| CN108986738B (en) * | 2018-07-18 | 2020-06-19 | 友达光电股份有限公司 | Pixel structure |
| CN108986738A (en) * | 2018-07-18 | 2018-12-11 | 友达光电股份有限公司 | Pixel structure |
| CN108877646A (en) * | 2018-07-26 | 2018-11-23 | 厦门凌阳华芯科技有限公司 | A kind of display circuit and display |
| CN108877646B (en) * | 2018-07-26 | 2020-03-06 | 厦门凌阳华芯科技有限公司 | Display circuit and display |
| CN110544455A (en) * | 2019-02-27 | 2019-12-06 | 友达光电股份有限公司 | pixel circuit and driving method thereof |
| CN114333665A (en) * | 2021-09-24 | 2022-04-12 | 友达光电股份有限公司 | Light emitting diode driving circuit |
| CN114333665B (en) * | 2021-09-24 | 2023-05-09 | 友达光电股份有限公司 | Light emitting diode driving circuit |
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| CN101714333B (en) | 2012-05-23 |
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