CN1320515C - Organic luminous display - Google Patents
Organic luminous display Download PDFInfo
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- CN1320515C CN1320515C CNB031053386A CN03105338A CN1320515C CN 1320515 C CN1320515 C CN 1320515C CN B031053386 A CNB031053386 A CN B031053386A CN 03105338 A CN03105338 A CN 03105338A CN 1320515 C CN1320515 C CN 1320515C
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Abstract
The present invention relates to an organic luminous display device which divides a power cord into a plurality of groups, and each voltage contact is coupled with a centre point of each group of power cord. All voltage contacts are coupled with a power supplier through a low impedance conducting material, and thus, the state of non-uniform image element brightness caused by voltage drop of each group of power cord is reduced.
Description
Technical field
The invention relates to a kind of organic light emitting display (Organic Light EmittingDisplay, be called for short OLED), and particularly power lead is distinguished into many groups relevant for a kind of, and each voltage contact is coupled to the mid point of each group power lead, and each voltage contact can be coupled to the organic light emitting display of power supply unit via low-impedance conductive material.
Background technology
The human dynamic image that can see the earliest is the film of documentary film kenel.Afterwards, the invention of cathode-ray tube (CRT) (Cathode Ray Tube is called for short CRT) successfully derives business-like televisor, and becomes the electrical home appliances of each family's indispensability.Along with development of science and technology, the application of CRT expands to the desktop monitor in the computer industry again, and makes CRT scene many decades nearly.But the made all types of displays of CRT all face the problem of radiant rays, and because the structure of internal electron rifle, and make that display is bulky and take up space, so be unfavorable for thin type and lightweight.
Since above-mentioned problem, and make the researchist start to develop so-called flat-panel screens (Flat Panel Display).This field comprises LCD (Liquid Crystal Display is called for short LCD), Field Emission Display (Field Emission Display is called for short FED), OLED and plasma display (Plasma Display Panel is called for short PDP).
Wherein, OLED is called organic electro-luminescent display (OrganicElectroluminescence Display is called for short OELD) again, and it is the element of self-luminosity.Because the characteristic of OLED is DC low-voltage driving, high brightness, high-level efficiency, high correlative value and frivolous, and its luminous color and luster is by red (Red, abbreviation R), green (Green, be called for short G) and blue (Blue, being called for short B) three primary colors are to white degree of freedom height, so OLED is called the development priority that next is a novel planar panel from generation to generation.The OLED technology is except having the frivolous and high resolving power of LCD concurrently, and the active illuminating of LED, response speed is fast with advantage such as power saving cold light source outside, multiple advantages such as the visual angle is wide in addition, color contrast is effective and cost is low.Therefore, OLED can be widely used in backlight, mobile phone, digital camera and the PDA(Personal Digital Assistant) etc. of LCD or indication billboard.
From the viewpoint of type of drive, OLED can be divided into passive-matrix type of drive and active matrix drive mode two big kinds.The advantage of passive matrix type OLED is that structure very simply and not needs to use thin film transistor (TFT) (Thin Film Transistor, be called for short TFT) drive, thereby cost is lower, but its shortcoming is the application that is not suitable for the high resolving power image quality, and, can produce that power consumption increases, component life reduces and problem that display performance is good etc. when large size panel develops.And the advantage of active-matrix formula OLED is except the demand that can be applicable to large-sized active matrix drive mode, and its visual angle is wide, high brightness and the fast characteristic of response speed also are very important, but its cost can be slightly higher than passive matrix type OLED.
According to the difference of type of drive, flat-panel screens can be divided into two kinds of voltage driven type and current drive-types again.Voltage driven type is applied in TFT-LCD usually, also just imports different voltage to data line, and reaches different GTGs, to reach full-color purpose.The TFT-LCD of voltage driven type possess skills maturation, stable and cheap advantage.And current drive-type is applied in the display of OLED usually, just imports different electric currents to data line, and reaches different GTGs, to reach full-color purpose.
In active OLED, owing to have the big electric current pel array inside of flowing through, and power lead is formed with very thin metal usually, so its impedance is all quite big, the while also can be caused the rapid drawdown of voltage.And be connected to the virtual voltage size of pixel (pixel), then can have influence on the size of current that flows to OLED, and then also can have influence on the brightness height of this pixel.Therefore the voltage difference that is caused on power lead will cause the uneven situation of pixel intensity.
Next please refer to Fig. 1, it is the synoptic diagram of voltage drop emulation of the power lead design of known a kind of OLED.In Fig. 1, power lead 102 is coupled to voltage Vdd.The electric current of supposing to flow through voltage Vdd power lead 102 being produced is I, and hypothesis power lead 102 is divided into several sections, every section power lead resistance be R.When electric current I flows through power lead 102, article one, the voltage of secondary source line 104 is Vdd, the voltage of second secondary source line 106 is Vdd-IR, article three, the voltage of secondary source line 108 is Vdd-2IR, the rest may be inferred, and the voltage of n (n is a positive integer) bar secondary source line 110 will be reduced to only surplus Vdd-nIR.Therefore, when lower (that is the voltage drop of each pixel is lower) of the voltage drop on the secondary source line, then the voltage between the both positive and negative polarity of the Organic Light Emitting Diode in each pixel also can fall the more, and the electric current of the feasible Organic Light Emitting Diode of flowing through reduces, brightness also can and then reduce, so article one the secondary source line will be mutually far short of what is expected with the brightness of the last item secondary source line, and cause the pixel intensity on the panel inhomogeneous.
In addition, on same panel, can utilize a plurality of voltage contacts to shorten the distance of the power lead that each voltage contact connected, and the secondary source line number of flowing through can less (that is the total current that is flow through on the power lead also can be less), so can be so that the voltage drop on every secondary source line reduces.Next please refer to Fig. 2, it is the synoptic diagram of voltage drop emulation of the power lead design of known another kind of OLED.In Fig. 2, power lead is distinguished into four groups, is respectively first group of power lead 202, second group of power lead 204, the 3rd group of power lead 206 and the 4th group of power lead 208; Each group power lead is coupled to M (M is a positive integer) bar secondary source line and N (N is a positive integer) bar secondary source line; And each group voltage contact that power lead connected is near N bar secondary source line (that is away from M bar secondary source line).The electric current of each the bar secondary source line in the M bar secondary source line of supposing to flow through is I1, the electric current of each the bar secondary source line in the N bar secondary source line of flowing through is I2, then the voltage of M bar secondary source line is Vdd-(M * I1 * R), and the voltage of N bar secondary source line is Vdd-(N * I2 * R).With first group of power lead 202 and second group of power lead 204 is example, the N bar secondary source line that first group of power lead 202 coupled will be mutually far short of what is expected with the voltage of second group of power lead, 204 M bar secondary source lines, so this known method still can cause the pixel intensity on the panel inhomogeneous.
Summary of the invention
In view of this, the present invention proposes a kind of organic light emitting display.The present invention is the mid point that the voltage contact is coupled to each group power lead, and the voltage contact can be coupled to power supply unit via low-impedance conductive material, therefore can reduce owing to the voltage drop on every group of power lead causes the uneven situation of pixel intensity.
For reaching above-mentioned and other purpose, the present invention proposes a kind of organic light emitting display.This organic light emitting display comprises multi-group power line and a plurality of voltage contact.These above-mentioned power leads are spaced from each other, and each group power lead is coupled to many corresponding secondary source lines.And each above-mentioned voltage contact is coupled to the mid point of each group power lead, and these voltage contacts are coupled in order to the power supply unit of voltage to be provided.Wherein, voltage can be organized the pairing secondary source line of power lead via each at the electric current that each group is produced on power lead, and flows among the pairing a plurality of pixels that the exciting light display arranged of each bar secondary source line.
In preferred embodiment of the present invention, these pixel packets are contained among the pel array of organic light emitting display.Each pixel comprises switching transistor, driving transistors, storage capacitors and light-emitting component.Above-mentioned switching transistor has first drain electrode, first grid and first source electrode, and wherein first drain electrode is coupled to data line, and first grid is coupled to sweep trace.Driving transistors has second drain electrode, second grid and second source electrode, and wherein second grid is coupled to first source electrode, and second source ground.Storage capacitors has first end and second end, and wherein first end is coupled to first source electrode and second grid, and the second end ground connection and be coupled to second source electrode.And light-emitting component has positive pole and negative pole, wherein positive pole be coupled to these secondary source lines one of them, and negative pole be coupled to second the drain electrode.Wherein, switching transistor and driving transistors are thin film transistor (TFT).And light-emitting component is Organic Light Emitting Diode or polymer LED.
The present invention also proposes a kind of organic light emitting display.This organic light emitting display comprises multi-group power line and a plurality of voltage contact.These above-mentioned power leads are spaced from each other, and each group power lead is coupled to many corresponding secondary source lines.And each above-mentioned voltage contact is coupled to each group power lead, and those voltage contacts are coupled to via conductive material in order to the power supply unit of voltage to be provided.Wherein, voltage can be organized the pairing secondary source line of power lead via each at the electric current that each group is produced on power lead, and flows among the pairing a plurality of pixels that the exciting light display arranged of each bar secondary source line.
The present invention also proposes a kind of organic light emitting display in addition.This organic light emitting display comprises multi-group power line and a plurality of voltage contact.These above-mentioned power leads are spaced from each other, and each group power lead is coupled to many corresponding secondary source lines.And each above-mentioned voltage contact is coupled to the mid point of each group power lead, and those voltage contacts are coupled to via conductive material in order to the power supply unit of voltage to be provided.Wherein, voltage can be organized the pairing secondary source line of power lead via each at the electric current that each group is produced on power lead, and flows among the pairing a plurality of pixels that the exciting light display arranged of each bar secondary source line.
In sum, the present invention is distinguished into many groups with power lead, and each voltage contact is coupled to the mid point of each group power lead, and whole voltage contacts can be coupled to power supply unit via low-impedance conductive material, therefore can reduce owing to the voltage drop on every group of power lead causes the uneven situation of pixel intensity.
Description of drawings
Fig. 1 is the synoptic diagram of voltage drop emulation of the power lead design of known a kind of OLED;
Fig. 2 is the synoptic diagram of voltage drop emulation of the power lead design of known another kind of OLED;
Fig. 3 is the integrated stand composition of the pel array of OLED of the present invention;
Fig. 4 is the circuit diagram of the pixel of OLED of the present invention;
Fig. 5 is the synoptic diagram according to the voltage drop emulation of the power lead design of the OLED of a preferred embodiment of the present invention;
Fig. 6 is the synoptic diagram of the connected mode of the voltage contact of known a kind of OLED and power supply unit; And
Fig. 7 is the synoptic diagram according to the connected mode of the voltage contact of the OLED of a preferred embodiment of the present invention and power supply unit.
102,204,206,208,210,502,504,506,508: power lead
104,106,108,110: the secondary source line
30: pel array
302: pixel
304: data line
306: sweep trace
402: switching transistor
404: driving transistors
406: storage capacitors
408: light-emitting component
510,512,514,516,602,702: the voltage contact
604: plain conductor
606: common joint
608,706: power supply unit
704: conductive material
Embodiment
Organic light emitting display of the present invention (OLED) is active OLED.Next please refer to Fig. 3, it is the integrated stand composition of the pel array 30 of OLED of the present invention.As shown in Figure 3, pel array 30 comprises a plurality of pixels 302, many data lines 304 and multi-strip scanning line 306.And the circuit diagram of the pixel 302 of OLED of the present invention please refer to shown in Figure 4.As shown in Figure 4, pixel 402 comprises switching transistor 402, driving transistors 404, storage capacitors 406 and light-emitting component 408.Above-mentioned switching transistor 402 has drain electrode, grid and source electrode.Above-mentioned driving transistors 404 has drain electrode, grid and source electrode.Storage capacitors 406 has first end and second end.Light-emitting component 408 has positive pole and negative pole.Wherein, the drain electrode of switching transistor 402 is coupled to data line 304, and the grid of switching transistor 402 is coupled to sweep trace 306, and the source electrode of switching transistor 402 is coupled to the grid of driving transistors 404 and first end of storage capacitors 406.The drain electrode of driving transistors 404 is coupled to the negative pole of light-emitting component 408, the source ground of driving transistors 404 and be coupled to second end of storage capacitors 406.The anode of light-emitting component 408 is coupled to the secondary source line, and the secondary source line can be coupled to via power lead in order to the power supply unit of voltage Vdd to be provided.In addition, switching transistor 402 and driving transistors 404 can for example be thin film transistor (TFT)s.And light-emitting component 408 can for example be Organic Light Emitting Diode or polymer LED.Because light-emitting component 408 is the elements that belong to current drives, so must there be electric current to pass through, just can make light-emitting component 408 luminous.Yet, when the voltage on the secondary source line reduces, will have influence on the size of current that flows to light-emitting component 408, and then also can have influence on the brightness height of pixel 302, thus, will cause the pixel intensity on the panel inhomogeneous.
Next please refer to Fig. 5, it is the synoptic diagram according to the voltage drop emulation of the power lead design of the OLED of a preferred embodiment of the present invention.This OLED comprises multi-group power line and a plurality of voltage contact, in this preferred embodiment, for the purpose of the convenience that illustrates, only does explanation with four groups of power leads and four voltage contacts, but those who familiarize themselves with the technology to recognize be, not as limit.As shown in Figure 5, first group of power lead 502, second group of power lead 504, the 3rd group of power lead 506 and the 4th group of power lead 508 are spaced from each other, and each group power lead is coupled to corresponding 2N (N is a positive integer) bar secondary source line.Wherein, the electric current that voltage Vdd is produced on each group power lead can be organized the pairing secondary source line of power lead via each, and flows among the pairing pixel of each bar secondary source line.By Fig. 5 also as can be known, voltage contact 510 is coupled to the mid point that mid point, voltage contact 516 that the mid point of first group of power lead 502, mid point, voltage contact 514 that voltage contact 512 is coupled to second group of power lead 504 be coupled to the 3rd group of power lead 506 are coupled to the 4th group of power lead 508, and each voltage contact can be coupled in order to the power supply unit of voltage Vdd to be provided.In Fig. 5, the electric current of each the bar secondary source line in the N bar secondary source line of supposing to flow through is I, and then the voltage of N bar secondary source line is Vdd-(N * I * R).With first group of power lead 502 and second group of power lead 504 is example, (N * I * R) is so can make the uneven situation of pixel intensity on the panel greatly reduce because the voltage of article one secondary source line 520 that the last item secondary source line 518 that first group of power lead 502 coupled and second group of power lead 504 are coupled is Vdd-.
Next will illustrate that a plurality of voltage contacts connect the mode of external power supply.Please refer to Fig. 6, it is the synoptic diagram of the connected mode of the voltage contact of known a kind of OLED and power supply unit.As shown in Figure 6, a plurality of voltage contacts 602 can be earlier and the plain conductor 604 on the oled panel link to each other, pull out a common joint 606 again and be connected to power supply unit 608.Because it is quite big that the impedance phase of plain conductor 604, is added the electric current of flowing through when big, will cause very big power consumption and voltage drop.And, can strengthen the area of plain conductor 604 usually in order to reduce the impedance of plain conductor 604, will account for the very big area of panel thus.
In order to improve above-mentioned shortcoming, the present invention directly links to each other each voltage contact with low-impedance conductive material, be connected to power supply unit.Please refer to Fig. 7, it is the synoptic diagram according to the connected mode of the voltage contact of the OLED of a preferred embodiment of the present invention and power supply unit.As shown in Figure 7, a plurality of voltage contacts 702 are understood first and external conductive material 704 and are linked to each other, and then are connected to power supply unit 706.Because the impedance phase of conductive material 704 when low, therefore is connected to a plurality of voltage contacts 702 from power supply unit 706, will not have too many voltage drop and power consumption.Moreover, because conductive material 704 is external, so can not account for the area of panel.
In sum, the present invention is distinguished into many groups with power lead, and each voltage contact is coupled to the mid point of each group power lead, and whole voltage contacts can be coupled to power supply unit via low-impedance conductive material, therefore can reduce owing to the voltage drop on every group of power lead causes the uneven situation of pixel intensity.
Claims (12)
1. an organic light emitting display is characterized in that, this display comprises:
The multi-group power line, described every power lead is spaced from each other, and is coupled in its corresponding many secondary source lines; And
A plurality of voltage contacts, the corresponding mid point that is coupled to described every power lead of described each voltage contact, and be coupled in order to a power supply unit of a voltage to be provided;
Wherein, this voltage can produce an electric current at above-mentioned every power lead, and this electric current can be via the described every corresponding described every secondary source line of power lead, and flows among a plurality of pixels of its corresponding described organic light emitting display.
2. organic light emitting display as claimed in claim 1 is characterized in that, described each pixel packets is contained among the pel array of described organic light emitting display.
3. organic light emitting display as claimed in claim 1 is characterized in that, described each pixel comprises:
One switching transistor has one first drain electrode, a first grid and one first source electrode, and wherein this first drain electrode is coupled to a data line, and this first grid is coupled to the one scan line;
One driving transistors has one second drain electrode, a second grid and one second source electrode, and wherein this second grid is coupled to this first source electrode, and this second source ground;
One storage capacitors has one first end and one second end, and wherein this first end is coupled to this first source electrode and this second grid, and this second end ground connection and be coupled to this second source electrode; And
One light-emitting component has an anodal and negative pole, and wherein this positive pole is coupled to one of those secondary source lines, and this negative pole is coupled to this second drain electrode.
4. organic light emitting display as claimed in claim 3 is characterized in that, this switching transistor and this driving transistors are thin film transistor (TFT).
5. organic light emitting display as claimed in claim 3 is characterized in that, this light-emitting component is an Organic Light Emitting Diode.
6. organic light emitting display as claimed in claim 3 is characterized in that, this light-emitting component is a polymer LED.
7. an organic light emitting display is characterized in that, this display comprises:
The multi-group power line, described every power lead is spaced from each other, and is coupled in its corresponding many secondary source lines; And
A plurality of voltage contacts, the corresponding mid point that is coupled to described every power lead of above-mentioned each voltage contact, and be coupled in order to a power supply unit of a voltage to be provided via a conductive material;
Wherein, this voltage can produce an electric current at described each power lead, and this electric current can be via the described every corresponding described every secondary source line of power lead, and flows among a plurality of pixels of its corresponding described organic light emitting display.
8. organic light emitting display as claimed in claim 7 is characterized in that, described each pixel packets is contained among the pel array of described this organic light emitting display.
9. organic light emitting display as claimed in claim 7 is characterized in that, described each pixel comprises:
One switching transistor has one first drain electrode, a first grid and one first source electrode, and wherein this first drain electrode is coupled to a data line, and this first grid is coupled to the one scan line;
One driving transistors has one second drain electrode, a second grid and one second source electrode, and wherein this second grid is coupled to this first source electrode, and this second source ground;
One storage capacitors has one first end and one second end, and wherein this first end is coupled to this first source electrode and this second grid, and this second end ground connection and be coupled to this second source electrode; And
One light-emitting component has an anodal and negative pole, and wherein this positive pole is coupled to one of those secondary source lines, and this negative pole is coupled to this second drain electrode.
10. organic light emitting display as claimed in claim 9 is characterized in that, this switching transistor and this driving transistors are thin film transistor (TFT).
11. organic light emitting display as claimed in claim 9 is characterized in that, this light-emitting component is an Organic Light Emitting Diode.
12. organic light emitting display as claimed in claim 9 is characterized in that, this light-emitting component is a polymer LED.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031053386A CN1320515C (en) | 2003-02-24 | 2003-02-24 | Organic luminous display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031053386A CN1320515C (en) | 2003-02-24 | 2003-02-24 | Organic luminous display |
Publications (2)
| Publication Number | Publication Date |
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| CN1525426A CN1525426A (en) | 2004-09-01 |
| CN1320515C true CN1320515C (en) | 2007-06-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB031053386A Expired - Lifetime CN1320515C (en) | 2003-02-24 | 2003-02-24 | Organic luminous display |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100583139B1 (en) * | 2004-10-08 | 2006-05-23 | 삼성에스디아이 주식회사 | Light emitting display |
| US20070126728A1 (en) * | 2005-12-05 | 2007-06-07 | Toppoly Optoelectronics Corp. | Power circuit for display and fabrication method thereof |
| JP5146090B2 (en) * | 2008-05-08 | 2013-02-20 | ソニー株式会社 | EL display panel, electronic device, and driving method of EL display panel |
| CN112639946A (en) * | 2018-12-24 | 2021-04-09 | 深圳市柔宇科技股份有限公司 | Display panel, preparation method thereof and display device |
| CN111862891B (en) * | 2019-04-25 | 2021-10-01 | 上海和辉光电股份有限公司 | Organic light emitting display |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0968695A (en) * | 1995-09-01 | 1997-03-11 | Hitachi Ltd | Gradation voltage generating circuit and liquid crystal display device |
| CN1216135A (en) * | 1997-01-28 | 1999-05-05 | 卡西欧计算机株式会社 | Electroluminescent display device and driving method thereof |
| US20010043168A1 (en) * | 2000-05-12 | 2001-11-22 | Semiconductor Energy Laboratory Co., Ltd. | Display device |
| CN1329368A (en) * | 2000-06-13 | 2002-01-02 | 株式会社半导体能源研究所 | Display device |
| CN1360350A (en) * | 2000-12-21 | 2002-07-24 | 株式会社半导体能源研究所 | Luminous apparatus and method for mfg. same |
-
2003
- 2003-02-24 CN CNB031053386A patent/CN1320515C/en not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0968695A (en) * | 1995-09-01 | 1997-03-11 | Hitachi Ltd | Gradation voltage generating circuit and liquid crystal display device |
| CN1216135A (en) * | 1997-01-28 | 1999-05-05 | 卡西欧计算机株式会社 | Electroluminescent display device and driving method thereof |
| US20010043168A1 (en) * | 2000-05-12 | 2001-11-22 | Semiconductor Energy Laboratory Co., Ltd. | Display device |
| CN1329368A (en) * | 2000-06-13 | 2002-01-02 | 株式会社半导体能源研究所 | Display device |
| CN1360350A (en) * | 2000-12-21 | 2002-07-24 | 株式会社半导体能源研究所 | Luminous apparatus and method for mfg. same |
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| CN1525426A (en) | 2004-09-01 |
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