CN1738496A - Method and display device for improving series type organic electro-luminescence element color shift - Google Patents
Method and display device for improving series type organic electro-luminescence element color shift Download PDFInfo
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- CN1738496A CN1738496A CN 200510083225 CN200510083225A CN1738496A CN 1738496 A CN1738496 A CN 1738496A CN 200510083225 CN200510083225 CN 200510083225 CN 200510083225 A CN200510083225 A CN 200510083225A CN 1738496 A CN1738496 A CN 1738496A
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Abstract
Disclosed a series OELD comprise a first OELD, a second OELD and a contiguous layer which connects the first OELD and the second OELD. The method for improving the color deviation of series OELD comprises: detecting the tendency of color deviation of first OELD and second OELD according to the amount of current in them; combining the first OELD and second OELD with different color deviation tendencies according to aforementioned tendency of color deviation; supporting a current to the series OELD to realize the mutual indemnification of the lights between the first OLED and the second OLED in different color deviation tendencies, to attain the light with better purity.
Description
Technical field
The present invention relates to a kind of combined method of series type organic electro-luminescence element, particularly relate to a kind of display unit of improving the method for series type organic electro-luminescence element color shift and adopting this method.
Background technology
Organic electroluminescent element (organic electroluminescence device, OELD), compared to other plane Display Technique, excellent specific property such as have self-luminous, high brightness, wide viewing angle, high contrast, low power consumption, high-speed responsive, operating temperature range is wide, luminous efficiency is high, technology is simple and easy makes its product technology development gazed at by the whole world.
Please refer to Fig. 1, it illustrates a kind of schematic diagram of traditional organic electroluminescent element.Traditional organic electroluminescent element 1 has sandwich construction, mainly is to insert an organic luminous layer 15 between anode (being formed on the substrate 10) 11 and negative electrode 19, to produce electroluminescence (electroluminescence).Between organic luminous layer 15 and anode 11, form a hole transmission layer 13, and also can form a hole injection layer (not shown) between hole transmission layer 13 and the anode 11, between organic luminous layer 15 and negative electrode 19, then form an electron transfer layer 17.This kind sandwich construction can be beneficial to electronics and flow toward anode 11 directions after negative electrode 19 injects.And organic luminous layer 15 can be divided into two kinds according to the use of material, a kind of is that micromolecule light-emitting diode based on dyestuff or pigment is called OLED (organic light-emitting diode) or OEL (organic electroluminescence), and another kind is that the light-emitting diode based on macromolecule is called PLED (polymer light-emitting diode) or LEP (light-emitting polymer).
For the OELD industry, the luminous efficiency of one color product significantly promotes, yet its final goal is still in full-colorization.Full-color OELD be by red (red, R), blue (blue, B), green (green, G) the repetition pixel of primaries is formed, Pixel Dimensions is meticulous more, resolution is also just high more naturally.And the employed full-colorization technology of OELD industry is broadly divided into three kinds at present, and first kind is RGB list type vapour deposition method (RGB side-by-side pattern), makes red bluish-green three primary colors independent luminous; Second kind be on the OELD display panel of white light (white light), add colored filter (color filter, CF); The third then is to use blue light is light emitting source, sees through a slice optical color conversion film and becomes red bluish-green three photochromic photochromic transformation approach.Wherein former again two kinds of technology are the extensive use of dealer institute.
Luminously have luminous efficiency (efficiency) and can reach optimized advantage though red bluish-green three look materials are independent; yet, needs can make technology comparatively complicated except using photomask; manufacturer is proper to must grasping of the photochromic purity of luminescent material and efficient, moreover red bluish-green three pixels need the relatively poor and fineness (resolution) of different driving voltage, color contrast (contrast) to have to be strengthened.Above various shortcoming makes the correlative study of second kind of (white light variegates filter) technology increase day by day.
Second kind of technology is the whole layer of evaporation white light OLED on the TFT substrate, again in OLED light-emitting area applying a slice colored filter, can send when making white light pass colored filter red, blue, green three kinds photochromic, see through different TFT and control red, blue, green glow pixel respectively, make panel present required color.And the second kind of technology that is suitable for volume production has the following advantages: the colored filter that can directly use liquid crystal display cells; Need not use photomask and make its technology comparatively simple, therefore be easy to make the panel of high image quality, fine pixel yet; Moreover do not need contraposition in the technology of evaporation OELD and then can promote productive rate; Color contrast and fineness are all very excellent.White light OELD now, its structure mainly can be divided into two elements (two-element) composition and element (three-element) is formed, purpose is and makes it launch the photochromic of wide spectrum, and then after seeing through colored filter, stays purer indigo plant, green, ruddiness.Though the full-color technology that white light variegates filter has many advantages, its bottleneck is that the photochromic purity control of white luminescent material is difficult for, and makes photochromic and expection generation drop.
Fig. 2 A is a kind of spectrum schematic diagram of traditional organic electroluminescent element.The organic luminous layer of supposing the organic electroluminescent element of Fig. 2 A clips a hole barrier layer by a phosphorescent blue light material and a phosphorescent gold-tinted material and is formed.After applying a voltage, can make light-emitting component send white light.Yet the spectrum of white light can be offset to some extent under same electric field not, as Fig. 2 A (cd/m
2Be brill) shown in, what produce when low-voltage or general voltage photochromicly is white light blue partially (deflection short wavelength), and when high voltage, produce photochromicly be white light Huang (being partial to the long wavelength) partially.
And Fig. 2 B is the spectrum schematic diagram of another kind of traditional organic electroluminescent element.The organic luminous layer of supposing the organic electroluminescent element of Fig. 2 B clips a phosphorescent gold-tinted material by two phosphorescent blue light materials and is formed.After applying a voltage, can make light-emitting component send white light, and the spectrum of white light also can be offset to some extent under same electric field not.Shown in Fig. 2 B, what produce when low-voltage or general voltage photochromicly is white light yellow partially (deflection long wavelength), and when high voltage, produce photochromicly be white light indigo plant (being partial to the short wavelength) partially.
No matter be that a kind of colour cast situation shown in Fig. 2 A or Fig. 2 B, all can cause the photochromic and expection generation drop of GTG.Therefore " colour balance " variegates one of major issue very important in the full-color technology of filter for white light.
Summary of the invention
In view of this, purpose of the present invention is providing a kind of series type organic electro-luminescence element (organic electroluminescence device that improves exactly, OELD) method of colour cast, it is comparatively pure basically photochromic that tandem OELD after the combination can be sent.
According to purpose of the present invention, a kind of method of improving tandem OELD colour cast is proposed.Wherein, tandem OELD has one the one OELD, one the 2nd OELD and an articulamentum connects an OELD and the 2nd OELD.Method comprises:
According to the size of current flowing the one OELD and the 2nd OELD, check the colour cast trend of an OELD and the 2nd OELD respectively; And
According to the colour cast trend of an OELD and the 2nd OELD, make up an OELD and the 2nd OELD of different colour cast trend;
Give tandem OELD by applying an electric current, so that the photochromic mutual compensation of an OELD of different colour cast trend and the 2nd OELD, and obtain basically comparatively one pure photochromic.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, following conjunction with figs. and preferred embodiment are to illustrate in greater detail the present invention.
Description of drawings
Fig. 1 illustrates a kind of schematic diagram of traditional organic electroluminescent element.
Fig. 2 A is a kind of spectrum schematic diagram of traditional organic electroluminescent element.
Fig. 2 B is the spectrum schematic diagram of another kind of traditional organic electroluminescent element.
Fig. 3 illustrates the schematic diagram according to the series type organic electro-luminescence element of one embodiment of the present invention.
Fig. 4, it illustrates the method flow diagram that improves tandem OELD colour cast according to one embodiment of the present invention.
The simple symbol explanation
1: traditional organic electroluminescent element (OELD)
10,33: substrate
11,311: anode
13: hole transmission layer
15: organic luminous layer
17: electron transfer layer
19,321: negative electrode
30: series type organic electro-luminescence element
31: the one OELD
312: the first hole transmission layers
315: the first luminescent layers
316: the first electron transfer layers
32: the two OELD
322: the second electron transfer layers
325: the second luminescent layers
326: the second hole transmission layers
35: articulamentum
Embodiment
The present invention proposes a kind of series type organic electro-luminescence element (organicelectroluminescence device that improves, OELD) method of colour cast, the photochromic of at least two OELD of different colour cast trend (also can be referred to as the colour cast degree) among the tandem OELD can be compensated mutually, and obtain basically comparatively one pure photochromic.The method can be applicable in a kind of display unit, to obtain comparatively pure basically white light.
Fig. 3 illustrates the schematic diagram according to the series type organic electro-luminescence element of one embodiment of the present invention.Series type organic electro-luminescence element 30 has one the one OELD31, one the 2nd OELD32 and an articulamentum 35 connects an OELD31 and the 2nd OELD32.
In an OELD31, comprise an anode (being formed on the substrate 33) 311,1 first hole transmission layer 312, one first luminescent layer 315 and one first electron transfer layer 316.Wherein, the anode 311 and first hole transmission layer 312 (or adding into a hole injection layer between the anode 311 and first hole transmission layer 312) are collectively referred to as source, first hole again; And first electron transfer layer 316 (or adding into an electron injecting layer between first electron transfer layer 316 and articulamentum 35) is called first electron source.First luminescent layer 315 is arranged between the source, first hole and first electron source.Can be formed by a R.G.B guest emitter and a host emitter as for first luminescent layer 315, or be formed by the different photochromic or identical substantially photochromic inferior luminescent layers of multilayer.
In like manner, in the 2nd OELD32, comprise a negative electrode 321, one second electron transfer layer 322, one second luminescent layer 325 and one second hole transmission layer 326.Wherein, the negative electrode 321 and second electron transfer layer 322 (or adding into an electron injecting layer between second electron transfer layer 322 and negative electrode 321) are called second electron source again; And second hole transmission layer 326 (or adding into a hole injection layer between second hole transmission layer 326 and articulamentum 35) is collectively referred to as source, second hole.Second luminescent layer 325 is arranged between the source, second hole and second electron source.Also can be formed as for second luminescent layer 325, or be formed by the different photochromic or identical substantially photochromic inferior luminescent layers of multilayer by a R.G.B guest emitter and a host emitter.
Please refer to Fig. 4, it illustrates the method flow diagram that improves tandem OELD colour cast according to one embodiment of the present invention.The structure of tandem OELD please refer to Fig. 3.At first, shown in step 401,, check the colour cast trend of an OELD and the 2nd OELD respectively according to the size of current flowing the one OELD and the 2nd OELD.In step 401, can design an OELD and the 2nd OELD of multiple different structure earlier, measure under the different electric currents OELD of those different structures and the colour cast trend of the 2nd OELD again.
Then, shown in step 402,, make up an OELD and the 2nd OELD of different colour cast trend according to the colour cast trend of an OELD and the 2nd OELD.In step 402, can calculate an OELD and the 2nd OELD issuable chromatic value after connecting of different structure earlier, the chromatic value of selecting the series connection back to be produced again is offset 0.03 with an interior OELD and the 2nd OELD, to make up.The CIE of general white light
XValue and CIE
YValue represents its colour balance good more near (0.33,0.33) more.
Then, shown in step 403, give tandem OELD by applying an electric current so that the photochromic mutual compensation of an OELD of different colour cast trend and the 2nd OELD, and obtain basically comparatively one pure photochromic, photochromic as white light or other.
Certainly, this kind method can apply to also that other is photochromic, similarly be the photochromic colour cast trend of sending red OELD at present, still be partial to the inclined to one side orange of ruddiness, if can be according to the method that the foregoing description proposed, make the photochromic colour cast trend of another OELD and photochromic cooperation of the inclined to one side orange of OELD ruddiness,, just can obtain basically then that comparatively pure red is photochromic in order to mutual compensation.And other color is photochromic as green light, blue light ... etc., also applicable identical method obtains comparatively pure basically green photochromic or blue photochromic, more even the color on other chromatic diagram.
Below propose a practical application example, propose the explanation of an actual practice for method how to improve tandem OELD colour cast.
Application examples
The structure of tandem OELD please refer to Fig. 3.The OELD of multiple different structure at first, is provided.For example: can design and make the white light OELD of multiple different structure, make it can oriented long wavelength under same electric field not or the situation of short wavelength's skew.For example between voltage 3～8V, the CIE of colourity
XValue and CIE
YThe intensity of variation of value surpasses 0.03 respectively.Then, measure the colour cast trend of the OELD of these different structures.For example according to the size of the OELD of these different structures of current flowing, to measure the colour cast trend of OELD.
After measurement, also can the OELD of these different structures be distinguished into a long-wave band OELD group and a short-wave band OELD group according to the colour cast trend of OELD.
After measuring colour cast trend, in the OELD of these different structures optional both, in order to producing all possible a plurality of tandem compound, and calculate the hue error value of all possible those tandem compounds.For example be: optional one from long-wave band OELD group and short-wave band OELD group respectively, in order to producing all possible tandem compound, and obtain the hue error value of all possible tandem compound.
At last, a pure photochromic a string joint group closes to select to produce comparatively basically, with an OELD31 and the 2nd OELD32 as tandem OELD30 among Fig. 3.
According to the produced tandem OELD of said method, OELD that it comprised and the tandem compound of the 2nd OELD can produce pure white light.When applying a low current in tandem OELD, the photochromic of an OELD for example is that white light is blue partially, and the photochromic of the 2nd OELD is that white light is yellow partially, and mixed hue error value preferably is no more than 0.03; When applying a high electric current in tandem OELD, the photochromic of an OELD is that white light is yellow partially, and the photochromic of the 2nd OELD is that white light is blue partially, and mixed hue error value also preferably is no more than 0.03.
Do explanation though comprise two OELD with tandem OELD in the above-described embodiments, but tool knows that usually the knowledgeable is when understanding, also can use three even more OELD to be combined into tandem OELD, as long as can make the photochromic mutual compensation of a plurality of OELD of different colour cast trend after the combination, and obtain basically comparatively one pure photochromicly, also do not take off technical spirit of the present invention.
In sum; though the present invention discloses as above with preferred embodiment; yet it is not in order to limit the present invention; those skilled in the art without departing from the spirit and scope of the present invention; can do a little change and retouching, thus protection scope of the present invention should with accompanying Claim the person of being defined be as the criterion.
Claims (19)
1, a kind of method of improving series type organic electro-luminescence element color shift, this series type organic electro-luminescence element has one first organic electroluminescent element, one second organic electroluminescent element and an articulamentum and connects this first organic electroluminescent element and this second organic electroluminescent element, and this method comprises:
According to the size of this first organic electroluminescent element of current flowing and this second organic electroluminescent element, check the colour cast trend of this first organic electroluminescent element and this second organic electroluminescent element respectively; And
According to the colour cast trend of this first organic electroluminescent element and this second organic electroluminescent element, make up this first organic electroluminescent element and this second organic electroluminescent element of different colour cast trend;
Give this series type organic electro-luminescence element by applying an electric current, so that this first organic electroluminescent element of different colour cast trend and the photochromic mutual compensation of this second organic electroluminescent element, and obtain basically comparatively one pure photochromic.
2, the method for claim 1, wherein, according to the size of this first organic electroluminescent element of current flowing and this second organic electroluminescent element, check the step of the colour cast situation of this first organic electroluminescent element and this second organic electroluminescent element to comprise respectively:
Design this first organic electroluminescent element and this second organic electroluminescent element of multiple different structure; And
Measure under the different electric currents colour cast trend of this of those different structures first organic electroluminescent element and this second organic electroluminescent element.
3, the method for claim 1, wherein, according to the colour cast trend of this first organic electroluminescent element and this second organic electroluminescent element, make up this first organic electroluminescent element of different colour cast trend and the step of this second organic electroluminescent element and comprise:
Calculate this first organic electroluminescent element and this second organic electroluminescent element issuable chromatic value after connecting of different structure; And
The chromatic value of selecting the series connection back to be produced is offset 0.03 with this interior first organic electroluminescent element and this second organic electroluminescent element, in order to make up.
4, the method for claim 1, wherein this pure photochromic be that white light or other are photochromic.
When 5, the method for claim 1, wherein applying this electric current and be a low current, the photochromic of this first organic electroluminescent element is that white light is blue partially, and the photochromic of this second organic electroluminescent element be white light Huang partially.
When 6, the method for claim 1, wherein applying this electric current and be a high electric current, the photochromic of this first organic electroluminescent element is that white light is yellow partially, and the photochromic of this second organic electroluminescent element be white light indigo plant partially.
7, the method for claim 1, wherein, this first organic electroluminescent element and this second organic electroluminescent element comprise source, a hole, an electron source and a luminescent layer, this luminescent layer is arranged between this source, hole and the electron source, and this luminescent layer is made up of a R.G.B guest emitter and a host emitter.
8, the method for claim 1, wherein, this first organic electroluminescent element and this second organic electroluminescent element comprise source, a hole, an electron source and a luminescent layer, this luminescent layer is arranged between this source, hole and the electron source, and this luminescent layer is made up of the different photochromic or identical substantially photochromic inferior luminescent layers of multilayer.
9, a kind of display unit comprises the method for improving series type organic electro-luminescence element color shift as claimed in claim 1, in order to obtain comparatively pure basically white light.
10, a kind of method of improving series type organic electro-luminescence element color shift, this series type organic electro-luminescence element has one first organic electroluminescent element, one second organic electroluminescent element and an articulamentum and connects this first organic electroluminescent element and this second organic electroluminescent element, and this method comprises:
The organic electroluminescent element of multiple different structure is provided, and measures the colour cast trend of the organic electroluminescent element of those different structures;
In the organic electroluminescent element of those different structures optional both producing all possible a plurality of tandem compound, and calculate the hue error value of all possible those tandem compounds;
A pure photochromic a string joint group closes to select to produce comparatively basically, with this first organic electroluminescent element and this second organic electroluminescent element as this series type organic electro-luminescence element.
11, method as claimed in claim 10 wherein at the organic electroluminescent element that multiple different structure is provided and after measuring the step of colour cast trend of organic electroluminescent element of those different structures, also comprises:
According to the colour cast trend of the organic electroluminescent element of those different structures, the colour cast trend of those organic electroluminescent elements is distinguished into a long-wave band organic electroluminescent element group and a short-wave band organic electroluminescent element group.
12, method as claimed in claim 11, wherein in colour cast trend according to the organic electroluminescent element of those different structures, after the colour cast trend of those organic electroluminescent elements is distinguished into a long-wave band organic electroluminescent element group and a short-wave band organic electroluminescent element group's step, also comprise:
Choose one wantonly to produce all possible tandem compound, to obtain the hue error value of all possible tandem compound from this long-wave band organic electroluminescent element group and this short-wave band organic electroluminescent element group respectively.
13, method as claimed in claim 10 wherein selects hue error value to be no more than this tandem compound of 0.03, with this first organic electroluminescent element and this second organic electroluminescent element as this series type organic electro-luminescence element.
14, method as claimed in claim 10, wherein this pure photochromic be that white light or other are photochromic.
15, method as claimed in claim 10 is wherein according to the size of the organic electroluminescent element of those different structures of current flowing, with the colour cast trend of the organic electroluminescent element of measuring those different structures.
16, method as claimed in claim 15, wherein, when applying this electric current and being a low current, the photochromic of this first organic electroluminescent element is that white light is blue partially, the photochromic of this second organic electroluminescent element be white light Huang partially.
17, method as claimed in claim 15, wherein, when applying this electric current and be a high electric current, the photochromic of this first organic electroluminescent element is that white light is yellow partially, the photochromic of this second organic electroluminescent element be white light indigo plant partially.
18, the method for claim 1, wherein, this first organic electroluminescent element and this second organic electroluminescent element comprise source, a hole, an electron source and a luminescent layer, this luminescent layer is arranged between this source, hole and the electron source, and this luminescent layer is made up of a R.G.B guest emitter and a host emitter.
19, the method for claim 1, wherein, this first organic electroluminescent element and this second organic electroluminescent element comprise source, a hole, an electron source and a luminescent layer, this luminescent layer is arranged between this source, hole and the electron source, and this luminescent layer by multilayer different photochromic or substantially identical photochromic inferior luminescent layer formed.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100456450C (en) * | 2006-06-27 | 2009-01-28 | 友达光电股份有限公司 | Tandem type organic light emitting component, and forming method, and method for forming faceplate |
| CN109473047A (en) * | 2017-09-07 | 2019-03-15 | 英属开曼群岛商錼创科技股份有限公司 | Micro-led display panel and its driving method |
| CN111180601A (en) * | 2020-01-03 | 2020-05-19 | 京东方科技集团股份有限公司 | OLED display device, display substrate and preparation method thereof |
| US10777123B2 (en) | 2017-09-07 | 2020-09-15 | PlayNitride Inc. | Micro light emitting diode display panel and driving method thereof |
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| JP2003036973A (en) * | 2001-07-19 | 2003-02-07 | Pioneer Electronic Corp | Color display panel |
| SG113443A1 (en) * | 2001-12-05 | 2005-08-29 | Semiconductor Energy Laboratao | Organic semiconductor element |
| CN1275337C (en) * | 2003-09-17 | 2006-09-13 | 北京工大智源科技发展有限公司 | High-efficiency high-brightness multiple active district tunnel reclaimed white light light emitting diodes |
| JP4431379B2 (en) * | 2003-12-19 | 2010-03-10 | 東北パイオニア株式会社 | Organic EL device and method for forming the same |
| JP2005190768A (en) * | 2003-12-25 | 2005-07-14 | Toyota Industries Corp | Lighting apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100456450C (en) * | 2006-06-27 | 2009-01-28 | 友达光电股份有限公司 | Tandem type organic light emitting component, and forming method, and method for forming faceplate |
| CN109473047A (en) * | 2017-09-07 | 2019-03-15 | 英属开曼群岛商錼创科技股份有限公司 | Micro-led display panel and its driving method |
| US10777123B2 (en) | 2017-09-07 | 2020-09-15 | PlayNitride Inc. | Micro light emitting diode display panel and driving method thereof |
| CN111180601A (en) * | 2020-01-03 | 2020-05-19 | 京东方科技集团股份有限公司 | OLED display device, display substrate and preparation method thereof |
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| CN100426938C (en) | 2008-10-15 |
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