CN100542362C - Organic light emitting diode driving device - Google Patents
Organic light emitting diode driving device Download PDFInfo
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- CN100542362C CN100542362C CNB2006101484375A CN200610148437A CN100542362C CN 100542362 C CN100542362 C CN 100542362C CN B2006101484375 A CNB2006101484375 A CN B2006101484375A CN 200610148437 A CN200610148437 A CN 200610148437A CN 100542362 C CN100542362 C CN 100542362C
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- 239000003990 capacitor Substances 0.000 claims abstract description 40
- 230000007246 mechanism Effects 0.000 claims description 34
- 230000008859 change Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 17
- 229910021417 amorphous silicon Inorganic materials 0.000 description 7
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 208000033361 autosomal recessive with axonal neuropathy 2 spinocerebellar ataxia Diseases 0.000 description 3
- 229910044991 metal oxide Inorganic materials 0.000 description 2
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- 229920005591 polysilicon Polymers 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
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- 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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Abstract
The invention discloses an organic light emitting diode driving device, which comprises a first switching transistor, a first transistor, a second switching transistor, a storage capacitor and a second transistor, wherein the first switching transistor is used for receiving a data signal and outputting the data signal through the control of a first scanning signal. The first transistor is used for compensating the critical voltage of the second transistor. The second switch transistor is used for receiving the voltage signal and outputting the voltage signal through the control of the second scanning signal. The storage capacitor is used for storing a data voltage. The second transistor is connected to the second switching transistor through the storage capacitor. The invention can effectively release the charge of the storage capacitor, improve the display effect and change the input voltage potential to adapt to the integrated circuit with different operating voltages.
Description
Technical field
The present invention is relevant for a kind of drive unit, and is particularly to a kind of organic LED driving mechanism.
Background technology
Fig. 1 is the circuit diagram of existing organic LED driving mechanism.The organic LED driving mechanism of Fig. 1 comprises P type MOS (Metal Oxide Semiconductor, metal-oxide semiconductor (MOS)) transistor 101～106, in order to drive Organic Light Emitting Diode 107.The control end of transistor 101 receives first and selects signal S1, and the input of control data signal Vdata, data-signal Vdata inputs to holding capacitor 104 via transistor 102, the grid of the voltage-controlled transistor 105 on the holding capacitor 104 then, therefore, the output of transistor 105 produces the electric current corresponding to this voltage, the grid of transistor 106 is selected signal S2 control by second, and the electric current that transistor 105 produces makes Organic Light Emitting Diode 107 luminous through transistor 106, and the electric charge on the holding capacitor 104 discharges via transistor 103 again.
Fig. 2 is that data-signal Vdata, first selects signal S1 and second to select the oscillogram of the voltage of signal S2 to the time.When time T11～T12, first selects signal S1 to be positioned at electronegative potential, is the replacement period of holding capacitor 104 at this.When the time, T12 was to time T 14, data voltage Vdata was positioned at high potential, and be that holding capacitor 104 is stored data periods this moment.And when time T13～T14, second to select signal S2 be electronegative potential, is luminous period, and this moment, Organic Light Emitting Diode 107 was because the electric current that transistor 105 produces and luminous.
This existing circuit design is the critical voltage (threshold voltage) that uses transistor 102 to come compensation transistor 105, and the critical voltage of transistor 102 and transistor 105 is V
Th-102And V
Th-105, the electric current of the transistor 105 of flowing through is I, k is a proportionality constant, then can obtain following relational expression
Under ideal case, the critical voltage V of transistor 102
Th-102Equate with the critical voltage Vth-102 of transistor 105, then can obtain following relational expression
Thus relational expression as can be known electric current I not influenced by critical voltage, but the shortcoming of this available circuit is in the mechanism of using data-signal Vdata with holding capacitor 104 discharges, if voltage and the data-signal Vdata of node n1
Voltage when close, the electric charge of holding capacitor 104 can't be bled off fully, simultaneously, charging mechanism also can't adapt to the integrated circuit of different size operating voltage.
Summary of the invention
Purpose of the present invention is providing a kind of organic LED driving mechanism exactly, can promote the display effect of Organic Light Emitting Diode, effectively discharge holding capacitor electric charge, change the input voltage current potential with the integrated circuit that adapts to the different size operating voltage and be applicable to the low temperature polycrystalline silicon processing procedure and the amorphous silicon processing procedure.
The present invention proposes a kind of organic LED driving mechanism, comprises first switch, the first transistor, second switch, capacitor, transistor seconds.One end of first switch is in order to receive data-signal, and the control by first sweep signal and outputting data signals are to one first end of the first transistor, the control end of the first transistor electrically connects one second end of self and equivalence becomes a virtual diode formula structure, in order to the critical voltage of compensation transistor seconds, second switch is in order to receive voltage signal and to export this voltage signal by the control of second sweep signal.One end of capacitor is electrically connected to second switch, and the other end of capacitor also is connected to second end of the first transistor, in order to the storage data voltage.The control end of transistor seconds is electrically connected to second end of the first transistor and the other end of capacitor, input to the 3rd switch in order to produce a drive current, the 3rd switch is luminous in order to prevent the Organic Light Emitting Diode mistake, and the 3rd switch is output driving current by the control of second sweep signal.
According to the described organic LED driving mechanism of preferred embodiment of the present invention, the 3rd above-mentioned switch is electrically connected to an end of Organic Light Emitting Diode, and the other end of Organic Light Emitting Diode is electrically connected to second reference voltage.First switch, second switch and the 3rd switch are respectively the 3rd transistor, the 4th transistor and the 5th transistor.Organic LED driving mechanism is applicable to low temperature polycrystalline silicon (Low Temperature Poly Silicon) processing procedure, also applicable to amorphous silicon (Amorphous Silicon) processing procedure.
The present invention is directed into the structure of capacitor because of adopting by second switch with voltage signal, so can effectively discharge the electric charge of holding capacitor, the display effect of promoting Organic Light Emitting Diode, change input voltage current potential to adapt to the integrated circuit of different size operating voltage.Circuit design of the present invention is applicable to low temperature polycrystalline silicon processing procedure and amorphous silicon processing procedure.
For above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, preferred embodiment cited below particularly, and conjunction with figs. is described in detail below.
Description of drawings
Fig. 1 is the circuit diagram of existing organic LED driving mechanism.
Fig. 2 is that data-signal Vdata, first selects signal S1 and second to select the oscillogram of the voltage of signal S2 to the time.
Fig. 3 is the circuit diagram of the organic LED driving mechanism of the embodiment of the invention.
Fig. 4 is the oscillogram of the voltage of voltage signal VA1, the first sweep signal SCAN1 and the second sweep signal SCANX1 to the time.
Fig. 5 is the circuit diagram of the organic LED driving mechanism of another embodiment of the present invention.
Embodiment
Fig. 3 is the circuit diagram of the organic LED driving mechanism of the embodiment of the invention.The organic LED driving mechanism of Fig. 3 comprises first switching transistor 301, second switch transistor 302, the 3rd switching transistor 303, P type MOS the first transistor M2 and P type MOS transistor seconds M4, holding capacitor C1 and Organic Light Emitting Diode D1.Data-signal Vdata1 inputs to first switching transistor 301, first switching transistor 301 can be implemented with P type MOS the 3rd transistor M1, one first termination of the 3rd transistor M1 is received data-signal Vdata, and the control end of the 3rd transistor M1 receives the first sweep signal SCAN and controls outputting data signals Vdata.The first transistor M2 is coupled to the other end of transistor M1 to receive data-signal Vdata, the control end of the first transistor M2 and one second end of self electrically connect becomes a virtual diode form, in order to the critical voltage of compensation transistor seconds M4, transistor seconds M4 is in order to output driving current.
Holding capacitor C1 is in order to the storage data voltage, the end points U1 of holding capacitor C1 is electrically connected to second switch transistor 302, the end points U2 of holding capacitor C1 is electrically connected to the first transistor M2, one end of second switch transistor 302 is in order to receive voltage signal VA1, the control that second switch transistor 302 receives the second sweep signal SCANX1 comes output voltage signal VA1 to holding capacitor C1, and second switch transistor 302 can use P type MOS the 4th transistor M3 to implement.Present embodiment is by introducing the electric charge that voltage signal VA1 can effectively discharge holding capacitor C1, and since processing procedure, temperature etc. become because of, the critical voltage change can have influence on the drive current of transistor seconds M4 output, and the circuit design of present embodiment can increase the stability of circuit by the influence of compensation critical voltage.The control end of transistor seconds M4 receives the data voltage of holding capacitor C1 and output driving current, it is a supply voltage that the end of transistor seconds M4 is electrically connected to the first reference voltage Vdd, the other end is electrically connected to the 3rd switching transistor 303, the 3rd switching transistor 303 is coupled to Organic Light Emitting Diode D1, the second sweep signal SCANX1 controls the 3rd switching transistor 303, decide transistor seconds M4 drive current whether to input to the anode of Organic Light Emitting Diode D1, the negative terminal of Organic Light Emitting Diode D1 and to be electrically connected to the second reference voltage GND be earthed voltage, by the switch motion of the 3rd switching transistor 303, can prevent that Organic Light Emitting Diode D1 mistake is luminous.And the 3rd switching transistor 303 can use P type MOS the 5th transistor M5 to implement.
Fig. 4 is the oscillogram of the voltage of voltage signal VA1, the first sweep signal SCAN1 and the second sweep signal SCAN2 to the time.During time T 41 during to time T 42 is the replacement of holding capacitor C1, the second sweep signal SCANX1 is a low voltage potential, with the 4th transistor M3 conducting, the end points U1 of capacitor C 1 is pulled to low voltage potential, the voltage of the end points U2 of capacitor C 1 has been dragged down the pressure reduction of VA1 from high voltage potential to low voltage potential, drag down the voltage of the end points U2 of capacitor C 1, correctly to write the data value of correct data-signal Vdata in next sequential, can not influence the accuracy of data value because of the electric charge of script on electric capacity.
Time T 42 to time T 43 for during data voltage writes, in during this, the first sweep signal SCAN1 is a low voltage potential, with the 3rd transistor M1 conducting, the second sweep signal SCANX1 is a high voltage potential, the 4th transistor M3 and the 5th transistor M5 are closed, main purpose writes among the holding capacitor C1 for the voltage with data-signal Vdata, and the mode that the control end of the first transistor M2 and the output of self electrically connect, form a connected mode that is equivalent to diode, make that the voltage of the end points U2 have holding capacitor C1 is that Vdata subtracts V
Th-M2(V
Th-M2Critical voltage for transistor M2).Time T 43 is between the light emission period of OLED during to time T 44, the second sweep signal SCANX conducting the 4th transistor M3 and the 5th transistor M5, V
Th-M5Be the critical voltage of the 5th transistor M5, Id is a drive current, as following relational expression
The design principle of present embodiment is the critical voltage V of the first transistor M2
Th-M2Critical voltage V with transistor seconds M4
Th-M4Equate, can obtain the following relationship formula
Therefore the luminosity of Organic Light Emitting Diode D1 can be proportional to Id and irrelevant with the critical voltage variation amount of transistor seconds M4.
Fig. 5 describes the circuit diagram of the organic LED driving mechanism of another embodiment of the present invention.Adopt full P type mos transistor structure with Fig. 3, the organic LED driving mechanism of present embodiment comprises first switching transistor 501, second switch transistor 502, the 4th switching transistor 503, N type MOS the first transistor M7, N type MOS transistor seconds M9, holding capacitor C2 and Organic Light Emitting Diode D2 thereof, and form a full N type mos transistor structure, wherein first switching transistor 501, second switch transistor 502, the 4th switching transistor 503 comprise the 3rd transistor M6, the 4th transistor M8, the 6th transistor M10 respectively.The switch motion of the first transistor M7 is determined that by the first sweep signal SCAN2 the second sweep signal SCANX2 controls the 6th transistor M10 and circulates in the improper time to prevent drive current, and causes the luminous situation of Organic Light Emitting Diode D2 mistake.It is an earthed voltage that transistor seconds M9 is coupled to reference voltage GND, one end of the 4th switching transistor 503 is electrically connected to second end of transistor seconds M9, the 4th switching transistor 503 is exported the drive current that produced by transistor seconds M9 to Organic Light Emitting Diode D2 by the control of the second sweep signal SCANX2, wherein the other end of the 4th switching transistor 503 is electrically connected to the negative terminal of Organic Light Emitting Diode D2, and it is a supply voltage that the anode of Organic Light Emitting Diode D2 is electrically connected to the 3rd reference voltage VDD.The 4th transistor M8 controls by the second sweep signal SCANX2 and imports voltage VA2 to holding capacitor C2, in order to carry out the replacement action of holding capacitor C2.The first sweep signal SCAN2 and the second sweep signal SCANX2 are anti-phase with the first sweep signal SCAN1 and the second sweep signal SCANX1 of last embodiment respectively.
Organic LED driving mechanism in the foregoing description, transistor can use thin-film transistor to implement, and are applicable to low temperature polycrystalline silicon (Low Temperature Poly Silicon) processing procedure and amorphous silicon (AmorphousSilicon) processing procedure.The transistor of above-mentioned organic LED driving mechanism can use full P type MOS processing procedure or full N type MOS processing procedure, moreover, the processing procedure that the generation device of first sweep signal, second sweep signal, voltage signal can be combined with OLED is full P type MOS processing procedure or full N type MOS processing procedure, can reach save cost, processing procedure unified, promote yield, and reduce variation.
In sum, at organic LED driving mechanism of the present invention, owing to adopt voltage signal to see through the structure that switch comes control capacitor, therefore can promote the display effect of Organic Light Emitting Diode, effectively discharge holding capacitor electric charge, change the input voltage current potential with the integrated circuit that adapts to the different size operating voltage and be applicable to the low temperature polycrystalline silicon processing procedure and the amorphous silicon processing procedure.
Though the present invention discloses as above with preferred embodiment; right its is not in order to qualification the present invention, any those of ordinary skills, without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is when with being as the criterion that claim was defined.
Claims (14)
1. organic LED driving mechanism comprises:
One first switch, an end of this first switch is in order to receive a data-signal, and the other end of this first switch is in order to export this data-signal by the control of one first sweep signal;
One the first transistor, one first end of this first transistor is electrically connected to the other end of this first switch, and a control end of this first transistor self is electrically connected to one second end of this first transistor self;
One second switch, an end of this second switch is in order to receive a voltage signal, and the other end of this second switch is in order to export this voltage signal by the control of one second sweep signal;
One capacitor, an end of this capacitor is electrically connected to the other end of this second switch, and the other end of this capacitor is electrically connected to second end of this first transistor; And
One transistor seconds, the control end of this transistor seconds electrically connects second end of this first transistor and the other end of capacitor, one first end of this transistor seconds is electrically connected to one first reference voltage, and one second end of this transistor seconds inputs to an Organic Light Emitting Diode in order to produce a drive current.
2. organic LED driving mechanism as claimed in claim 1 is characterized in that, this first reference voltage is a supply voltage.
3. organic LED driving mechanism as claimed in claim 1, it is characterized in that, further comprise one the 3rd switch, one end of the 3rd switch is electrically connected to second end of this transistor seconds, the 3rd switch is exported the drive current that produced by this transistor seconds to this Organic Light Emitting Diode by the control of this second sweep signal, wherein the other end of the 3rd switch is electrically connected to the anode of this Organic Light Emitting Diode, and the negative terminal of this Organic Light Emitting Diode is electrically connected to one second reference voltage.
4. organic LED driving mechanism as claimed in claim 3 is characterized in that, this second reference voltage is an earthed voltage.
5. organic LED driving mechanism as claimed in claim 3 is characterized in that, the 3rd switch is one the 5th transistor.
6. organic LED driving mechanism as claimed in claim 5 is characterized in that, the 5th transistor is a P type MOS transistor.
7. organic LED driving mechanism as claimed in claim 1 is characterized in that, this first switch, this second switch are respectively one the 3rd transistor, one the 4th transistor.
8. organic LED driving mechanism as claimed in claim 1 is characterized in that, this first transistor, this transistor seconds, this first switch and this second switch are all P type MOS transistor.
9. organic LED driving mechanism as claimed in claim 1 is characterized in that, this first reference voltage is an earthed voltage.
10. organic LED driving mechanism as claimed in claim 1, it is characterized in that, further comprise one the 4th switch, one end of the 4th switch is electrically connected to second end of this transistor seconds, the 4th switch is exported the drive current that produced by this transistor seconds to this Organic Light Emitting Diode by the control of this second sweep signal, wherein the other end of the 4th switch is electrically connected to the negative terminal of this Organic Light Emitting Diode, and the anode of this Organic Light Emitting Diode is electrically connected to one the 3rd reference voltage.
11. organic LED driving mechanism as claimed in claim 10 is characterized in that, the 3rd reference voltage is a supply voltage.
12. organic LED driving mechanism as claimed in claim 10 is characterized in that, the 4th switch is one the 6th transistor.
13. organic LED driving mechanism as claimed in claim 10 is characterized in that, the 6th transistor is a N type MOS transistor.
14. organic LED driving mechanism as claimed in claim 10 is characterized in that, this first transistor, this transistor seconds, this first switch and this second switch are all N type MOS transistor.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006101484375A CN100542362C (en) | 2006-11-09 | 2006-11-09 | Organic light emitting diode driving device |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006101484375A CN100542362C (en) | 2006-11-09 | 2006-11-09 | Organic light emitting diode driving device |
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| CN101179881A CN101179881A (en) | 2008-05-14 |
| CN100542362C true CN100542362C (en) | 2009-09-16 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101826301B (en) * | 2010-04-28 | 2012-06-27 | 友达光电股份有限公司 | Light-emitting diode driving circuit and its driving method and display device |
| TWI780844B (en) * | 2021-07-29 | 2022-10-11 | 友達光電股份有限公司 | Driving circuit |
| CN114360433A (en) * | 2022-01-05 | 2022-04-15 | 深圳市华星光电半导体显示技术有限公司 | Pixel circuit and display panel |
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| CN1534568A (en) * | 2003-04-01 | 2004-10-06 | ����Sdi��ʽ���� | Light-emitting display, display screen and driving method thereof |
| US20050243076A1 (en) * | 2004-04-30 | 2005-11-03 | Kim Byeong K | Organic light-emitting device |
| CN1804977A (en) * | 2005-01-14 | 2006-07-19 | 三星电子株式会社 | Display device and driving method therefor |
| EP1220191B1 (en) * | 2000-12-29 | 2006-12-20 | Samsung SDI Co., Ltd. | Organic electroluminescent display, driving method and pixel circuit thereof |
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2006
- 2006-11-09 CN CNB2006101484375A patent/CN100542362C/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1516090A (en) * | 1998-03-18 | 2004-07-28 | ������������ʽ���� | Transistor circuits, display panels and electronic devices |
| EP1220191B1 (en) * | 2000-12-29 | 2006-12-20 | Samsung SDI Co., Ltd. | Organic electroluminescent display, driving method and pixel circuit thereof |
| JP2004126526A (en) * | 2002-07-31 | 2004-04-22 | Seiko Epson Corp | Electronic circuit, method of driving electronic circuit, electro-optical device, method of driving electro-optical device, and electronic apparatus |
| CN1510652A (en) * | 2002-09-25 | 2004-07-07 | ���ǵ�����ʽ���� | Organic light emitting display device and manufacturing method thereof |
| CN1534568A (en) * | 2003-04-01 | 2004-10-06 | ����Sdi��ʽ���� | Light-emitting display, display screen and driving method thereof |
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| CN1804977A (en) * | 2005-01-14 | 2006-07-19 | 三星电子株式会社 | Display device and driving method therefor |
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