CN100353399C - Active organic electroluminescence displaynig unit - Google Patents
Active organic electroluminescence displaynig unit Download PDFInfo
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- CN100353399C CN100353399C CNB031363458A CN03136345A CN100353399C CN 100353399 C CN100353399 C CN 100353399C CN B031363458 A CNB031363458 A CN B031363458A CN 03136345 A CN03136345 A CN 03136345A CN 100353399 C CN100353399 C CN 100353399C
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Abstract
The present invention relates to an organic electroluminescent display unit which comprises an organic light-emitting diode, a first driving transistor, a second driving transistor and a first switching transistor, wherein the first driving transistor is coupled between the anode of the organic light-emitting diode and a first voltage source with first waveform voltage, and the second driving transistor is coupled between the anode of the organic light-emitting diode and a second voltage source with second waveform voltage. In addition, the switching transistor is coupled with the grid electrodes of the first and the second driving transistors in order to enable the first and the second driving transistors to start during conduction, wherein the wave forms of the first and the second waveform voltage are complementary in order to alternately provide drive current for the organic light-emitting diode via the first and the second driving transistors.
Description
Technical field
The present invention relates to a kind of active organic electroluminescent display unit, particularly a kind of active organic electroluminescent display unit that promotes serviceable life.
Background technology
Organic electro-luminescent display (organic electroluminescent devices) is called Organic Light Emitting Diode (organic light emitting diode, OLED) display again.Because it has the characteristic of autoluminescence (selfemission) and can show by array, does not therefore need to be provided with backlight; In addition, organic electro-luminescent display has thin thickness, high contrast, low consumpting power, high resolving power and does not have advantage such as visual angle restriction, therefore is regarded as next flat panel display (flat panel display) from generation to generation.
With a kind of active organic electroluminescent display of the prior art is example, and its principle is luminous by current drives Organic Light Emitting Diode (OLED).At first please refer to Fig. 1, this figure is the electrical block diagram of a display unit (pixel) in the active organic electroluminescent display.As shown in the figure, the primary clustering in the display unit comprises an Organic Light Emitting Diode 1, a switching transistor T1, a driving transistors T2 and an electric capacity 2.Generally speaking, above-mentioned switching transistor T1 and driving transistors T2 can be thin film transistor (TFT) of the prior art (Thin-Film Transistor, form TFT).
Wherein, above-mentioned switching transistor T1 couples a data-signal (Data line) in drain electrode end, and couples one scan signal (Scan line) in gate terminal, by the conducting of this sweep signal controllable switch transistor T 1; In addition, the source electrode of switching transistor T1 couples the grid of aforementioned driving transistors T2, and driving transistors T2 in drain electrode end couple a voltage source V+, and be coupled with the anode of OLED 1 in source terminal.In addition, electric capacity 2 is coupled between the source electrode of the source electrode of aforementioned switches transistor T 1 and driving transistors T2.Wherein, when aforementioned switching transistor T1 conducting, electric capacity 2 can charge and keep a noble potential, and causes driving transistors T2 to form conducting, produce one thus from the flow through electric current of driving transistors T2 of voltage source V+end, and then driving Organic Light Emitting Diode 1 is luminous.
Wherein, active organic electroluminescent display unit circuit structure as shown in Figure 1 needs to produce a bigger working current process driving transistors T2 usually, and is luminous to drive Organic Light Emitting Diode 1.Yet, electric current will be through making the own critical voltage of driving transistors T2 (thresholdvoltage) rise and causing component characteristic to worsen for a long time, therefore along with the accumulation of service time, cause the magnitude of current to reduce gradually easily, produce the problem of the brightness decline of Organic Light Emitting Diode 1, and shorten the serviceable life of product.
As previously mentioned, only use single driving transistors T2 Control current in the active organic electroluminescent display unit of the prior art, luminous with driving machine light emitting diode 1.Therefore, another shortcoming of the circuit structure of prior art is: when above-mentioned driving transistors T2 is in unlatching (turn on) state always, will produces heat energy and make temperature improve by transistorized electric current, and cause transistorized critical voltage to descend simultaneously; Like this, will make the flow through transistorized magnitude of current rise again, and then produce heat energy and improve the temperature of transistor component; This vicious cycle often causes driving transistors T2 finally to collapse damage because of overheated.
In view of the shortcoming of the active organic electroluminescent display unit circuit of above-mentioned prior art, the present invention proposes a kind of active organic electroluminescent display unit, particularly a kind of active organic electroluminescent display unit that promotes serviceable life.
Summary of the invention
A kind of organic electro-luminescence display unit comprises an Organic Light Emitting Diode, one first driving transistors, one second driving transistors and a switching transistor.Wherein, first driving transistors is coupled to the anode of this Organic Light Emitting Diode and has between one first voltage source of one first waveform voltage.And second driving transistors is coupled to the anode of this Organic Light Emitting Diode and have between one second voltage source of one second waveform voltage.In addition, the aforementioned switches transistor couples the grid of above-mentioned first and second driving transistorss, in order to start (enable) above-mentioned first and second driving transistors when the conducting.
Wherein, both the waveform complementations of above-mentioned first and second waveform voltage are alternately to provide electric current to above-mentioned Organic Light Emitting Diode by above-mentioned first and second driving transistorss respectively.
In sum, it is luminous that the present invention drives Organic Light Emitting Diode by first driving transistors and the second driving transistors one after the other, can avoid single driving transistors to cause assembly temperature to raise because of being in unlatching (turnon) state for a long time, the while can be improved Yin Wendu and be caused driving transistors collapse and the shortcoming of damaging easily.In addition, the drive current average load so can effectively be improved because of long-term and use the problem that causes the driving transistors performance to descend, and can significantly promote the life-span of organic electro-luminescence display unit on two driving transistorss.
Description of drawings
Fig. 1 is the interior electrical block diagram of active organic electroluminescent display unit of prior art;
Fig. 2 is an active organic electroluminescent display unit circuit structural representation of the present invention;
Fig. 3 is the synoptic diagram of the first voltage source V a+ and the second voltage source V b+ voltage signal among Fig. 2.
Description of reference numerals:
1～Organic Light Emitting Diode (OLED);
2～electric capacity;
Fa～first waveform voltage;
Fb～second waveform voltage;
T1～switching transistor;
T2～driving transistors;
T2a～first driving transistors;
T2b～second driving transistors;
Va+ first voltage source;
Vb+～second voltage source.
Embodiment
At first please refer to Fig. 2, this figure is the electrical block diagram of active organic electroluminescent display unit of the present invention.As shown in the figure, the primary clustering in this display unit comprises an Organic Light Emitting Diode 1, a switching transistor T1, one first driving transistors T2a, one second driving transistors T2b and an electric capacity 2.Generally speaking, above-mentioned switching transistor T1, the first driving transistors T2a and the second driving transistors T2b can be thin film transistor (TFT) (Thin-Film Transistor, TFT) form of prior art.
Wherein, aforementioned switches transistor T 1 couples a data signals (Data line) in drain electrode end, and couples one scan signal (Scan line) in gate terminal, and the scanning signal by input is with the conducting of gauge tap transistor T 1; In addition, the source electrode of switching transistor T1 couples the grid of the aforementioned first driving transistors T2a, and the aforementioned first driving transistors T2a couples one first voltage source V a+ in drain electrode end, and the anode that is coupled with OLED 1 in source terminal.In addition, electric capacity 2 is coupled between the source electrode of the source electrode of aforementioned switches transistor T 1 and the first driving transistors T2a.
Wherein, even during 1 conducting of aforementioned switches transistor T, electric capacity 2 can charge and keep a noble potential, to start (enable) above-mentioned first driving transistors T2a, can produce one thus from the electric current of the first voltage source V a+, and then the Organic Light Emitting Diode 1 below driving is luminous through the above-mentioned first driving transistors T2a.
In addition, in circuit structure of the present invention, the source terminal of aforementioned switches transistor T 1 also is coupled to the grid of the second driving transistors T2b simultaneously, in order to can start (enable) above-mentioned second driving transistors T2b when the conducting.Wherein, the drain electrode end of the above-mentioned second driving transistors T2b couples one second voltage source V b+.Like this, when aforementioned switching transistor T1 conducting, can start (enable) above-mentioned first driving transistors T2a, can produce the electric current of the above-mentioned second driving transistors T2b of flowing through, and then it is luminous to drive the Organic Light Emitting Diode 1 of below by the second voltage source V b+.
In sum, when input one scan signal and data signals make 1 conducting of aforementioned switches transistor T, Organic Light Emitting Diode 1 can be respectively by coupling the first driving transistors T2a of the first voltage source V a+, and the second driving transistors T2b that perhaps couples the second voltage source V b+ drives and luminous.Wherein the brightness of Organic Light Emitting Diode 1 becomes big along with the electric current sum total by two driving transistors T2a, T2b increases.In addition, it is luminous that the present invention can flexibly use the above-mentioned first driving transistors T2a or second driving transistors T2b driving Organic Light Emitting Diode 1 by controlling the first voltage source V a+ and the second voltage source V b+.
Further, please refer to Fig. 3, this figure is the synoptic diagram of the first voltage source V a+ and the second voltage source V b+ voltage signal among Fig. 2.As shown in the figure, the above-mentioned first voltage source V a+ has one first waveform voltage Fa, and the second voltage source V b+ has one second waveform voltage Fb; In addition, the above-mentioned first waveform voltage Fa and the second waveform voltage Fb provide a noble potential in alternately complementary mode, generally speaking Fa equates with the current potential peak value of Fb, can produce a drive current and cause Organic Light Emitting Diode 1 luminous respectively via the aforementioned first driving transistors T2a and the second driving transistors T2b thus.
As shown in Figure 3, the first voltage source V a+ and the second voltage source V b+ are one-period with the time T, and a noble potential is provided alternately; Wherein, the first voltage source V a+ is in an opening during Ta, and provides a driving voltage to the first driving transistors T2a, and this moment, the second voltage source V b+ then was in a high impedance or off state relatively, and driving voltage is not provided.On the contrary, during Tb, then provide a driving voltage to the second driving transistors T2b, and the first voltage source V a+ is in a high impedance or off state relatively, and driving voltage is not provided by the second voltage source V b+.
In sum, sequential configuration by the above-mentioned first voltage source V a+ and the second voltage source V b+, the present invention not only can reach the effect that driving circuit had in the display unit of prior art, also because being used alternatingly of the aforementioned first driving transistors T2a and the second driving transistors T2b, can make the drive current average load on two driving transistors T2a, T2b, can effectively improve like this because of long-term and use the problem that causes the driving transistors performance to descend, and can significantly promote the life-span of organic electro-luminescence display unit.
In addition, it is luminous that the present invention drives Organic Light Emitting Diode 1 by the first driving transistors T2a and the second driving transistors T2b one after the other, can avoid single driving transistors to cause assembly temperature to raise because of being in unlatching (turn on) state for a long time, the while can be improved Yin Wendu and be caused driving transistors collapse and the shortcoming of damaging easily.
Though the present invention discloses as above with preferred embodiment; so it is not in order to limit scope of the present invention; any technician in this area; without departing from the spirit and scope of the present invention; can do suitable change and retouching, so protection scope of the present invention should be as the criterion with the scope that accompanying Claim was defined.
Claims (5)
1. an active organic electroluminescent display unit comprises
One Organic Light Emitting Diode;
One first driving transistors is coupled to the anode of this Organic Light Emitting Diode and has between one first voltage source of first waveform voltage;
One second driving transistors is coupled to the anode of this Organic Light Emitting Diode and has between one second voltage source of second waveform voltage;
One switching transistor is coupled to the grid of this first and second driving transistors, in order to start this first and second driving transistors when the conducting;
Wherein, the waveform complementation of this first and second waveform voltage is alternately to provide drive current to this Organic Light Emitting Diode by this first and second driving transistors respectively.
2. active organic electroluminescent display unit as claimed in claim 1, wherein this switching transistor, this first driving transistors and this second driving transistors are thin film transistor (TFT).
3. active organic electroluminescent display unit as claimed in claim 1 also comprises an electric capacity, in order to provide a voltage starting this first and this second driving transistors.
4. active organic electroluminescent display unit as claimed in claim 1, wherein this first waveform voltage and this second waveform voltage are alternately complementary square wave.
5. active organic electroluminescent display unit as claimed in claim 1, wherein this first waveform voltage equates with the voltage peak of this second waveform.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031363458A CN100353399C (en) | 2003-05-29 | 2003-05-29 | Active organic electroluminescence displaynig unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031363458A CN100353399C (en) | 2003-05-29 | 2003-05-29 | Active organic electroluminescence displaynig unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1553421A CN1553421A (en) | 2004-12-08 |
| CN100353399C true CN100353399C (en) | 2007-12-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB031363458A Expired - Lifetime CN100353399C (en) | 2003-05-29 | 2003-05-29 | Active organic electroluminescence displaynig unit |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100452158C (en) * | 2006-10-12 | 2009-01-14 | 友达光电股份有限公司 | Driving controlling device and method for display array |
| CN101937647B (en) * | 2010-09-02 | 2012-09-05 | 上海交通大学 | Complementary driving type pixel circuit |
| CN104021763B (en) * | 2014-06-11 | 2017-12-08 | 合肥鑫晟光电科技有限公司 | The driving method of image element circuit, display device and image element circuit |
| CN106297661B (en) * | 2016-09-08 | 2018-02-27 | 京东方科技集团股份有限公司 | Image element circuit and its driving method, display device |
| CN110853592A (en) * | 2019-11-14 | 2020-02-28 | 深圳市华星光电半导体显示技术有限公司 | Driving circuit and driving method of display panel |
| CN111613178A (en) * | 2020-06-29 | 2020-09-01 | 京东方科技集团股份有限公司 | Pixel circuit, driving method thereof, display substrate and display device |
| CN111986615B (en) * | 2020-08-27 | 2021-08-03 | 武汉华星光电技术有限公司 | Pixel circuit and display panel |
| US11238784B1 (en) | 2020-08-27 | 2022-02-01 | Wuhan China Star Optoelectronics Technology Co., Ltd. | Pixel circuit and display panel |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5576726A (en) * | 1994-11-21 | 1996-11-19 | Motorola | Electro-luminescent display device driven by two opposite phase alternating voltages and method therefor |
| US6229506B1 (en) * | 1997-04-23 | 2001-05-08 | Sarnoff Corporation | Active matrix light emitting diode pixel structure and concomitant method |
| JP2001147659A (en) * | 1999-11-18 | 2001-05-29 | Sony Corp | Display device |
-
2003
- 2003-05-29 CN CNB031363458A patent/CN100353399C/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5576726A (en) * | 1994-11-21 | 1996-11-19 | Motorola | Electro-luminescent display device driven by two opposite phase alternating voltages and method therefor |
| US6229506B1 (en) * | 1997-04-23 | 2001-05-08 | Sarnoff Corporation | Active matrix light emitting diode pixel structure and concomitant method |
| JP2001147659A (en) * | 1999-11-18 | 2001-05-29 | Sony Corp | Display device |
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| CN1553421A (en) | 2004-12-08 |
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