CN102385834A - Structure for adjusting organic light-emitting diode display with standing current and driving method thereof - Google Patents
Structure for adjusting organic light-emitting diode display with standing current and driving method thereof Download PDFInfo
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- CN102385834A CN102385834A CN2010102691006A CN201010269100A CN102385834A CN 102385834 A CN102385834 A CN 102385834A CN 2010102691006 A CN2010102691006 A CN 2010102691006A CN 201010269100 A CN201010269100 A CN 201010269100A CN 102385834 A CN102385834 A CN 102385834A
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Abstract
The invention discloses a structure for adjusting an organic light-emitting diode display with standing current and a driving method thereof. The technical scheme is that a boosting current stabilizer is coupled between a driving voltage wire of a file driver and file power wires, the boosting current stabilizer firstly boosts a driving voltage so as to obtain an output voltage larger than the driving voltage, and then limits the current so as to maintain the current flowing through organic light-emitting diode devices to be at a certain value, thereby solving the problem that the homogeneous degree of displaying of the organic light-emitting diode display differs due to inconformity of the current. Further the boosted output voltage provides sufficient voltage to drive the organic light-emitting diode devices, and the voltage for driving the organic light-emitting diode devices can not be affected by inner resistance value increased by degradation, thereby achieving the aim of reducing the recession in a short time of light-emitting ratio of an organic light-emitting diode panel.
Description
Technical field
The present invention relates to a kind of organic luminuous dipolar object display, be specifically related to the structure that a kind of steady current is regulated organic luminuous dipolar object display.The invention still further relates to a kind of steady current and regulate the driving method of organic luminuous dipolar object display.
Background technology
Organic light emitting diode (Organic Light Emitting Diode; Be called for short OLED) itself be to be a current driving element; Its luminosity is to decide according to the size through electric current; Because the size of control organic light emitting diode drive current can reach the effect that shows different brightness (being called the GTG value again), so the degree of stability of electric current is extremely important.If the organic light emitting diode constant current source can't be provided, then the electric current uniformity problem can take place, and if the defective that integral panels brightness differs will take place uncontrollable proper in the electric current uniformity problem.
As shown in Figure 1, it is general organic luminuous dipolar object display circuit box synoptic diagram.In this circuit block diagram, comprise organic light emitting diode (AMOLED) panel 11, data driver 12 and scanner driver 13.Wherein this organic light emitting diode (AMOLED) panel 11 comprises y * x organic light emitting diode element 111, and wherein y, x are positive integer.This data driver 12 is that y the data electric current I 1～Iy to y of output-stage circuit (figure is last not to be shown) output via inside shows machine light emitting diode element 111.The capable organic light emitting diode element 111 of x is the scanning signal Com1～Comx according to these scanner driver 13 outputs, and coordination information electric current I 1～Iy produces the required image display light source of this organic light emitting diode (AMOLED) panel 11.
Yet in this data driver 12, its current source circuit provides decides electric current I, and via y mirror circuit do multiple mirror with produce data electric current I 1, I2 ... Iy.In the case, data power lead 121 can be drawn very longly usually.Therefore data power lead 121 supply voltage generals who has surrendered long and that length is uneven influence not good important factor of data electric current I 1～Iy uniformity coefficient.
In addition, after this organic light emitting diode (AMOLED) panel 11 was worked a period of times, the organic light emitting diode element 111 in it was understood deteriorations and is increased internal resistance value; Cause driving voltage not enough, and the luminosity factor that this organic light emitting diode (AMOLED) panel 11 takes place (about 2 years) defective of decline easily at short notice is as shown in Figure 2; Be the use curve map of general organic light emitting diode element, the curve among the figure is the experimental verification curve of fiduciary level under the hot and humid environment condition, wherein causes rising and the required energy shortage of this organic light emitting diode element internal resistance; Make luminescence efficiency be linear attenuation, promptly briliancy (Lumdecay) drops to below total briliancy 50% (industrywide standard T50), and shortens the serviceable life of this organic light emitting diode element; The section (running-in period) of arrow indication is for dying because of architectural characteristic is when organic light emitting diode element is initially lighted in the figure; The initial stage briliancy can be progressively just progressively stable toward beginning to the one section running-in time that rises, but because of previous reasons, curve can appear initially up down decays after a period of time again; General industry is for solving the characteristic of running-in period; Common meeting painstakingly with the full-luminous area of organic light emitting diode element light make to break-in after stable again row process product, but its life-span will waste this section running-in time, if the organic light emitting diode element is without this section break-in; And with this product displaying contents; Initial displaying contents will be obvious especially in full display frame, and this existing picture is for being referred to as " ghost ", shows full display frame (count entirely and light) again after for example showing the ABC font at the beginning; Can be again in the picture of lighting entirely of counting the image of residual original ABC, former because light at the beginning form ABC count than other backs luminous count bright especially.
Summary of the invention
Technical matters to be solved by this invention provides the structure that a kind of steady current is regulated organic luminuous dipolar object display, and it can solve the problem that causes the luminous uniformity coefficient inequality of organic luminuous dipolar object display because of electric current is inconsistent.
For solving the problems of the technologies described above, the technical solution that steady current of the present invention is regulated the structure of organic luminuous dipolar object display is:
Comprise: an organic light emitting diode (AMOLED) panel, it has a plurality of organic light emitting diode elements, and respectively this organic light emitting diode element has a negative pole and a positive pole; One data driver, it includes a drive voltage line and plural data power lead, and respectively this data power supply linear system couples the negative pole of this organic light emitting diode element; One scans driver, and it includes plural number scanning RCA, and respectively this scanning signal linear system couples the positive pole of this organic light emitting diode element; One current regulator that boosts; It includes a boosting unit and a current limliting unit, and this boosting unit system couples the drive voltage line of this data driver, boosts in order to the driving voltage to this data driver; To produce an output voltage greater than this driving voltage; This current limliting unary system couples between this boosting unit and each the data power lead, and this output voltage is carried out current limliting, makes to flow through respectively that the electric current of this organic light emitting diode element maintains certain value.
The present invention also provides a kind of steady current to regulate the driving method of organic luminuous dipolar object display, and its technical solution is:
Between the drive voltage line of data driver and each data power lead, couple the current regulator that boosts; This current regulator that boosts boosts driving voltage earlier; To obtain an output voltage greater than this driving voltage; Carry out current limliting subsequently, make and flow through respectively that the electric current of this organic light emitting diode element maintains certain value.
Further; This current regulator that boosts includes a boosting unit and a current limliting unit; This boosting unit system couples the drive voltage line of this data driver; Driving voltage in order to this data driver boosts, and this current limliting unary system couples between this boosting unit and each the data power lead, and this output voltage is carried out current limliting.
The technique effect that the present invention can reach is:
The present invention can provide a stable electrical flow valuve to the organic light emitting diode element, to solve the problem that causes the luminous uniformity coefficient inequality of organic luminuous dipolar object display because of electric current is inconsistent.
The present invention can provide an output voltage greater than driving voltage, with the probability of the decline at short notice that reduces this organic light emitting diode (AMOLED) panel luminosity factor.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is done further detailed explanation:
Fig. 1 is a prior art organic luminuous dipolar object display circuit box synoptic diagram;
Fig. 2 is the use curve map of prior art organic light emitting diode element;
Fig. 3 is a circuit box synoptic diagram of the present invention;
Fig. 4 is the use curve comparison diagram of the present invention and prior art organic light emitting diode element;
Fig. 5 is another embodiment of the present invention circuit box synoptic diagram.
Description of reference numerals among the figure:
Among Fig. 1 to Fig. 2:
11 is organic light emitting diode (AMOLED) panel, and 111 is the organic light emitting diode element,
12 is the data driver, and 121 is the data power lead,
13 is scanner driver;
Among Fig. 3 to Fig. 5:
20 is organic light emitting diode (AMOLED) panel, and 21 is the organic light emitting diode element,
211 is negative pole, and 212 is anodal,
30 is the data driver, and 31 is drive voltage line,
32 is the data power lead, and 40 for scanning driver,
41 are the scanning RCA, and 50 for boosting current regulator,
51 is boosting unit, and 52 is the current limliting unit.
Embodiment
As shown in Figure 3; A kind of steady current that the embodiment of the invention provided is regulated the structure of organic luminuous dipolar object display; This organic luminuous dipolar object display can be a kind of passive array organic luminuous dipolar object display or current-mode active array organic luminuous dipolar object display; This organic luminuous dipolar object display mainly is to scan driver 40 and one 50 of the current regulators that boost by an organic light emitting diode (AMOLED) panel 20, a data driver 30, to form, wherein:
This organic light emitting diode (AMOLED) panel 20; With Fig. 3 is the benchmark of direction definition; Laterally (OK) is defined as x; Vertically (row) are defined as y, and this organic light emitting diode (AMOLED) panel 20 horizontal (x) and vertical (y) have been spaced a plurality of x * y organic light emitting diode elements 21, and respectively this organic light emitting diode element 21 has a negative pole 211 and one anodal 212.
This data driver 30, it includes a drive voltage line 31 and plural data power lead 32, and this drive voltage line 31 is output one driving voltage, and respectively this data power lead 32 is to couple to be the vertically negative pole 211 of this organic light emitting diode element 21 of (y) arrangement.
This scans driver 40; It includes plural number scanning RCA 41; Respectively this scanning signal line 41 is to couple the positive pole 212 that is this organic light emitting diode element 20 that laterally (x) arrange, so that the whether scanning signal Com1～Comx of start of this organic light emitting diode element 21 to be provided.
This current regulator 50 that boosts; Be to lift to be arranged to be example outside this data driver in the present embodiment; This current regulator 50 that boosts includes a boosting unit 51 and a current limliting unit 52, and this boosting unit 51 is the drive voltage line 31 that couples this data driver 30, boosts in order to the driving voltage to this data driver 30; To produce an output voltage greater than this driving voltage; Certainly, this output voltage after boosting ties up in the withstand voltage voltage range of this this organic light emitting diode element 21, and this current limliting unit 52 is to couple between this boosting unit 51 and each the data power lead 32; This output voltage is carried out current limliting, make and flow through respectively that the data electric current I 1～Iy of this organic light emitting diode element 21 maintains certain value.
What be worth explanation is; Be coupled to the drive voltage line 31 of this data driver 30 and the current regulator 50 that boosts between each data power lead 32; Wherein these current limliting unit 52 main systems utilize a comparer to detect the electric current that flows through, and as comparing with the benchmark of setting electric current, control the conducting resistance of an electric crystal again; With effective output one stable electrical flow valuve; Let and flow through respectively that the data electric current I 1～In of this organic light emitting diode element 21 maintains certain value, because to reach the circuit of this current limliting unit 52 be prior art and can reach the function of current limliting for multiple configuration, therefore; With the circuit of this current limliting unit 52 impartial variations, all should belong in the scope that patent of the present invention contains.Same, the circuit of this boosting unit 51 is prior art and can reaches the function of boosting for multiple configuration, therefore, with the circuit of these boosting unit 51 equalization variations, also belongs in the scope that patent of the present invention contains.
The above is the structure and the configuration explanation thereof of each main member of the embodiment of the invention.
In view of the above; Because the present invention is coupled with this current regulator 50 that boosts between the drive voltage line 31 of this data driver 30 and each data power lead 32; And this current regulator 50 that boosts boosts by the driving voltage of the boosting unit in it 51 with this data driver 30; And the value of the output voltage after boosting system drives the product of the maximum conducting resistance of required minimum current value and this data power lead 32 greater than this organic light emitting diode element 11; And the output voltage after boosting reaches this current limliting unit 52 and carries out current limliting output, to provide a stable electrical flow valuve to this organic light emitting diode element 21, therefore; Drive the required electric current of these organic light emitting diode element 21 starts; Can not receive that the long or length of this data power lead 32 is uneven to be caused supply voltage to fall institute to influence, and be able to provide a stable electrical flow valuve, can solve the problem of electric current uniformity really to this organic light emitting diode element 21 respectively.
Secondly; After this organic light emitting diode (AMOLED) panel 20 is worked a period of times; Organic light emitting diode element 21 in it can deteriorations and when increasing internal resistance value; Because the present invention is boosted by the boosting unit 51 of this current regulator 50 that the boosts driving voltage with this data driver 30, to produce an output voltage greater than this driving voltage, therefore; This output voltage still provides the voltage of an abundance to drive this organic light emitting diode element 21; Can not influence and drive the required voltage of this organic light emitting diode element 21, use and reach the purpose of decline at short notice that reduces these organic light emitting diode (AMOLED) panel 20 luminosity factors, promptly prolong the serviceable life of this organic light emitting diode (AMOLED) panel 20 because of the internal resistance value that deterioration increased.
As shown in Figure 4; Be the use curve comparison diagram of the present invention with general organic light emitting diode element; Each curve among the figure is the experimental verification curve of fiduciary level under the hot and humid environment condition; Wherein curve A is the use curve of general organic light emitting diode element; Curve B is a use curve of the present invention; Because of improving (first booster tension) with its energy requirement in advance, the present invention again input steady current behind the current limitation is supplied with the organic light emitting diode element; Because of inflow current is so that steady current mechanism supply organic light emitting diode element institute energy requirement is fixing need not go through running-in period (initial stage organic light emitting diode element break-in characteristic is upwards by the current limliting nip); And can solid its Acceptable life of problem that ghost was effectively used and also can be solved to this section period can be prolonged, in addition, the present invention still can effectively provide steady current to make the organic light emitting diode element luminous under the condition of high briliancy and can keep the long-acting life-span and treat most to its organic material consumption of organic light emitting diode element because of getting institute's energy requirement ready organic light emitting diode element then long-term the use earlier under the situation about hindering within essential deterioration produces down; So the present invention has life-saving, the advantage of no ghost.
In addition; A kind of steady current provided by the present invention is regulated the driving method of organic luminuous dipolar object display; It mainly couples the current regulator that boosts between the drive voltage line of data driver and each data power lead, this current regulator that boosts boosts driving voltage earlier, to obtain an output voltage greater than this driving voltage; Carry out current limliting subsequently, make and flow through respectively that the electric current of this organic light emitting diode element maintains certain value.Further; This current regulator that boosts includes a boosting unit and a current limliting unit; This boosting unit system couples the drive voltage line of this data driver; Driving voltage in order to this data driver boosts, and this current limliting unary system couples between this boosting unit and each the data power lead, and this output voltage is carried out current limliting.
At last; This boosts current regulator 50 except the outside of being located at this data driver 30, and is as shown in Figure 5, and this current regulator 50 that boosts also can directly be located within this data driver 30; This current regulator 50 that boosts includes a boosting unit 51 and a current limliting unit 52 equally; This boosting unit 51 is the drive voltage line 31 that couples this data driver 30, boosts in order to the driving voltage to this data driver 30 equally, and this current limliting unit 52 is to couple between this boosting unit 51 and each the data power lead 32; Equally this output voltage is carried out current limliting, use the state that another can be implemented of reaching.
In sum, this embodiment and diagram are merely the present invention's preferred embodiment, when can not with the scope of qualification the present invention enforcement, the equalization of promptly doing according to claim of the present invention generally changes and modifies, and all should belong in the scope that patent of the present invention contains.
Claims (3)
1. the structure that steady current is regulated organic luminuous dipolar object display is characterized in that, comprising:
One organic light emitting diode (AMOLED) panel, it has a plurality of organic light emitting diode elements, and respectively this organic light emitting diode element has a negative pole and a positive pole;
One data driver, it includes a drive voltage line and plural data power lead, and respectively this data power supply linear system couples the negative pole of this organic light emitting diode element;
One scans driver, and it includes plural number scanning RCA, and respectively this scanning signal linear system couples the positive pole of this organic light emitting diode element;
One current regulator that boosts; It includes a boosting unit and a current limliting unit, and this boosting unit system couples the drive voltage line of this data driver, boosts in order to the driving voltage to this data driver; To produce an output voltage greater than this driving voltage; This current limliting unary system couples between this boosting unit and each the data power lead, and this output voltage is carried out current limliting, makes to flow through respectively that the electric current of this organic light emitting diode element maintains certain value.
2. a steady current is regulated the driving method of organic luminuous dipolar object display; It is characterized in that: between the drive voltage line of data driver and each data power lead, couple the current regulator that boosts; The said current regulator that boosts boosts driving voltage earlier; To obtain an output voltage greater than this driving voltage, carry out current limliting subsequently, make and flow through respectively that the electric current of this organic light emitting diode element maintains certain value.
3. steady current according to claim 2 is regulated the driving method of organic luminuous dipolar object display; It is characterized in that: the said current regulator that boosts includes a boosting unit and a current limliting unit; This boosting unit system couples the drive voltage line of this data driver; Driving voltage in order to this data driver boosts, and this current limliting unary system couples between this boosting unit and each the data power lead, and this output voltage is carried out current limliting.
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| CN2010102691006A CN102385834A (en) | 2010-09-01 | 2010-09-01 | Structure for adjusting organic light-emitting diode display with standing current and driving method thereof |
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| CN108022964A (en) * | 2017-12-27 | 2018-05-11 | 武汉华星光电半导体显示技术有限公司 | Oled display panel and oled display |
| US10360848B2 (en) | 2015-07-24 | 2019-07-23 | Everdisplay Optronics (Shanghai) Limited | Pixel compensating circuit |
| US10699641B2 (en) | 2017-12-27 | 2020-06-30 | Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | OLED display panel and OLED display device |
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Application publication date: 20120321 |