CN102612858A - Organic el panel and method for manufacturing same - Google Patents
Organic el panel and method for manufacturing same Download PDFInfo
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- CN102612858A CN102612858A CN2009801624669A CN200980162466A CN102612858A CN 102612858 A CN102612858 A CN 102612858A CN 2009801624669 A CN2009801624669 A CN 2009801624669A CN 200980162466 A CN200980162466 A CN 200980162466A CN 102612858 A CN102612858 A CN 102612858A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/10—Apparatus or processes specially adapted to the manufacture of electroluminescent light sources
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/17—Passive-matrix OLED displays
- H10K59/173—Passive-matrix OLED displays comprising banks or shadow masks
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K2102/00—Constructional details relating to the organic devices covered by this subclass
- H10K2102/301—Details of OLEDs
- H10K2102/341—Short-circuit prevention
Abstract
The surface of a coat material layer formed on an electrode is planarized, and at the same time, correct patterning is performed so as to uniformly form a film thereon. In an organic EL panel (100), a first electrode (11) is formed on a substrate (10), a pattern (20A) of an insulating wall (20) is formed on the substrate (10) so as to surround the surface to be coated on the first electrode (11), a coat material layer (14) is formed by applying a coat material onto the surface to be coated within the pattern (20A) of the insulating wall (20), an organic layer (13) including a light emitting layer is laminated on the coat material layer (14), and a second electrode (12) is formed on the organic layer (13). The insulating wall (20) has, on the inner surface of the pattern (20A), an overhung section (20B) which suppresses expansion of the coat material layer (14), an insulating wall (20) portion above the coat material layer (14) is deformed by heating and melting the insulating wall (20) after forming the coat material layer (14), and a tilted surface (22) or a curved surface (22A) which ensures continuity of the second electrode (12) is formed.
Description
Technical field
The present invention relates to a kind of organic EL panel and manufacturing approach thereof.
Background technology
Organic EL has the range upon range of structure that comprises the organic layer of luminescent layer between 1 pair of electrode, possesses the insulation system thing of on the structure or electrically dividing organic EL at the organic EL panel that disposes single or a plurality of these organic ELs on the substrate.As the insulation system thing, have to divide to be formed on the dielectric film of the electrode on the substrate or to be used to separate by the next door of the electrode of film forming on organic layer etc. by each pixel.
In this organic EL, become in the organic layer by the surface state of the electrode of film forming face the quality of the characteristics of luminescence is brought very big influence.If electrode surface has concavo-convexly, then become inhomogeneous by the thickness of vapor deposition organic layer on it, be prone in the organic EL produce leak etc. luminous bad.Developed the technology of on coating wet type organic layer (electric conductive polymer etc.) and the organic layer that is being flattened on electrode film forming luminescent layer etc. in order to eliminate this phenomenon.
For example, record the organic EL panel that possesses insulation wall as shown in Figure 1 in the following patent documentation 1.This is in the past in the technology; The 1st electrode J2 corresponding with a plurality of pixels is set on the insulating surface of substrate J1; And insulation wall J3 is set with the mode of surrounding the 1st electrode J2; On insulation wall J3 and the 1st electrode J2, form electric conductive polymer layer J4, on this electric conductive polymer layer J4, form the organic layer J5 that comprises luminescent layer, on this organic layer J5, form the 2nd electrode J6.
Patent documentation 1: the open 2004-145244 communique of Japan Patent
Summary of the invention
Invent problem to be solved
According to this technology in the past; The concavo-convex flattening surface that makes self like the coating material layer filling electrode surface of electric conductive polymer layer; Therefore can realize being laminated in the homogenizing of the film on it, and can realize improving release-resistance etc. and improve luminescent properties or endurance quality.In addition, added acceptor (dopant) in the wet type film forming of film forming on electrode, improve the electric charge injection efficiency thus, thereby can realize low-voltageization.
Yet; As shown in Figure 1; If be insulated wall area surrounded formation coating material layer; The surface that then is formed on the coating material layer on the electrode is owing to the surface tension attached to the coating material of insulation wall J3 side becomes uneven, and the thickness that causes being formed film (vapor-deposited film etc.) on it is different at central part and periphery, and generation can't obtain uniform luminous problem being insulated the whole pixel region that wall surrounds.
In addition; If the inboard tiltangle that kind as shown in Figure 1 less (less than the right angle) of the side among the insulation wall J3; Then cause only being formed at the coating material layer that gets final product on the 1st electrode J2 and be formed into the position that need not the coating material layer, the problem of the pattern formation of coating material layer can't be suitably carried out in generation.
The present invention is to address this is that the example as problem.That is, the objective of the invention is to, carry out suitable pattern when making the flattening surface of the coating material layer that is formed on the electrode and form the homogenizing of seeking to be formed film on it, improve the characteristics of luminescence of organic EL etc. thus.
The means of dealing with problems
In order to realize this purpose, possesses following structure at least based on organic EL panel of the present invention and manufacturing approach thereof.
A kind of organic EL panel is characterized in that, possesses: substrate; The 1st electrode directly or through other layers is formed on this substrate; The coating material layer is applied and is formed on said the 1st electrode; Insulation wall, pattern form said coating material layer; Organic layer is laminated on the said coating material layer and comprises luminescent layer; And the 2nd electrode; Be formed on this organic layer; Said insulation wall has the side that contacts with said coating material layer and suppresses the overhang of the diffusion of this coating material layer, and above said coating material layer, has successional inclined plane or the curved surface of guaranteeing said the 2nd electrode.
A kind of manufacturing approach of organic EL panel is characterized in that, has: the operation that on substrate, forms the 1st electrode directly or through other layers; In the operation that forms the pattern of insulation wall on the said substrate with the mode of surrounding the face that is applied on said the 1st electrode; Said being applied in the pattern of said insulation wall is coated with the operation that coating material forms the coating material layer on the face; The operation that comprises the organic layer of luminescent layer in said coating material layer laminated; Reach the operation that on said organic layer, forms the 2nd electrode; Said insulation wall has the overhang of the diffusion that suppresses said coating material layer at the inner face of said pattern; After forming said coating material layer; Make the upper section distortion of the said coating material layer in this insulation wall through this insulation wall of heating and melting, thereby form successional inclined plane or the curved surface of guaranteeing said the 2nd electrode.
Description of drawings
Fig. 1 is technological in the past key diagram.
Fig. 2 is the key diagram (this figure (a) is the X-X sectional view among this figure (b), and this figure (b) is a vertical view) of the structure of the related organic EL panel of an explanation execution mode of the present invention.
Fig. 3 is the key diagram of the manufacturing approach of the related organic EL panel of explanation execution mode of the present invention.
Fig. 4 is the key diagram of the various form examples of expression insulation wall.
Fig. 5 is the key diagram of the various form examples of expression insulation wall.
Fig. 6 is the key diagram of the formation example of the related organic EL panel of expression execution mode of the present invention.
Fig. 7 is the key diagram of the formation example of the related organic EL panel of expression execution mode of the present invention.
Fig. 8 is the key diagram of the formation example of the related organic EL panel of expression execution mode of the present invention.
Fig. 9 is the key diagram of the formation example of the related organic EL panel of expression execution mode of the present invention.
Embodiment
Below, with reference to accompanying drawing execution mode of the present invention is described.Execution mode of the present invention comprises illustrated content, but is not limited to this.Fig. 2 is the key diagram (this figure (a) is the X-X sectional view among this figure (b), and this figure (b) is a vertical view) of the structure of the related organic EL panel of an explanation execution mode of the present invention.The related organic EL panel 100 of execution mode of the present invention is being for to be formed on the range upon range of organic EL panel that the organic EL 1 of the organic layer 13 that comprises luminescent layer is arranged between the 1st electrode 11 and the 2nd electrode 12 on the substrate 10, it possesses substrate 10, directly or through other layers are formed on the 1st electrode 11 on the substrate 10, are applied the coating material layer 14 that is formed on the 1st electrode 11, pattern forms coating material layer 14 insulation wall 20, be laminated on the coating material layer 14 and comprise the organic layer 13 of luminescent layer and be formed on the 2nd electrode 12 on the organic layer 13.In embodiment illustrated, insulation wall 20 is formed along the sidepiece of the 1st electrode 11, and on the 1st electrode 11, forms patterns of openings 20A.The pattern of insulation wall 20 is not limited to this patterns of openings 20A, can form various forms, can coating material layer 14 pattern be become free shape according to the form of this pattern.
Fig. 3 is the key diagram of the manufacturing approach of the related organic EL panel of explanation execution mode of the present invention.The manufacturing approach of organic EL panel 100 has: operation 1 directly or through other layers forms the 1st electrode 11 (with reference to figure 3 (a)) on substrate 10; Operation 2 is at the pattern (with reference to figure 3 (b)) that forms insulation wall 20 on the substrate 10 with the mode of surrounding the face that is applied on the 1st electrode 11; Operation 3, the face that the is applied coating coating material on the 1st electrode 11 in the pattern of insulation wall 20 forms coating material layer 14 (with reference to figure 3 (c)); Operation 4 is carried out heating and melting to insulation wall 20 and is handled (maturation process) (with reference to figure 3 (d)); Operation 5 comprises the organic layer 13 (with reference to figure 3 (e)) of luminescent layer in coating material layer 14 laminated; And operation 6, on organic layer 13, form the 2nd electrode 12 (with reference to figure 3 (f)).In the embodiment illustrated, form insulation wall 20 and on the 1st electrode 11, form patterns of openings 20A at the sidepiece along the 1st electrode 11 on the substrate 10, the face that is applied that is made as coating material in this patterns of openings 20A.
In aforementioned operation 1, for example form conducting film utilizing glass, plastics, surface to be formed with on the substrate 10 of metal etc. of dielectric film, and form the pattern that operation forms the 1st electrode 11 through patterns such as photo-mask processs through vapor deposition, sputter etc.
In aforementioned operation 2, not only form the patterns of openings 20A of insulation wall 20, also form overhang at insulation wall 20.In the insulation wall 20, for example spin coating is had a mind to reduce peeling off of UV transmitance and is used negative type photoresist, and carries out prebake.And the hard chrome mask irradiation UV light through possessing transmissive slit also makes public.At this moment, because the UV light transmission of described photoresist is lower, therefore produce dissolubility poor of relative imaging liquid at depth direction.Therefore, through to substrate 10 spray imaging liquids and poor according to video picture property, form insulation wall 20 with the overhang 20B shown in Fig. 3 (b).In the embodiment illustrated, the vertical sectional shape in the insulation wall 20 is roughly isosceles-trapezium-shaped.
Utilize apparatus for coating 14A coating coating material in the aforementioned operation 3.Comprise spraying in this said coating, divide be coated with, ink-jet, printing etc.The material etc. that comprises low molecular material in macromolecular material, the macromolecular material is suitable as coating material, can utilize the sol-gel film that gathers alkylthrophene derivative, polyaniline derivative, triphenylamine, inorganic compound, comprise lewis acidic organic compound film, electroconductive polymer etc.In this operation 3, be formed overhang 20B, suppressed the diffusion of coating material layer 14 thus, coating material layer 14 general planar ground cambium layer on the 1st electrode 11 at insulation wall 20.
In the aforementioned operation 4, after forming coating material layer 14, the substrate 10 that is formed the 1st electrode 11, insulation wall 20, coating material layer 14 is put into heating tank M, impose heating and melting and handle.Thus, the top of insulation wall 20 (upper section of coating material layer 14) distortion forms inclined plane 22 shown in Figure 2 or the curved surface 22A shown in Fig. 3 (b).Thus, insulation wall 20 has the side 21 that contacts with coating material layer 14 and suppresses the overhang 20B of the diffusion of coating material layer 14, and above coating material layer 14, has successional inclined plane 22 or the curved surface 22B that guarantees the 2nd electrode 12.
In the aforementioned operation 5, the organic layer 13 that comprises luminescent layer is formed through vacuum evaporation etc.Formation example to being formed at the organic layer 13 on the coating material layer 14 describes.For example, at first film forming NPB (N, N-di (naphtalence)-N is N-dipheneyl-benzidene) as hole transmission layer.This hole transmission layer has the function with the hole transport that is injected into from lower electrode line 2 to luminescent layer.This hole transmission layer can be only range upon range of 1 layer transport layer, also can be range upon range of transport layer more than 2 layers.In addition, hole transmission layer can be formed 1 layer rather than based on the film forming of homogenous material, also can in the higher material of main part of charge transport ability, be supplied with the higher guest materials of (holding) property by the doping electric charge by a plurality of materials.
Then, film forming luminescent layer on hole transmission layer.As an example, also utilize branch to be coated with through the resistance heating vapour deposition method and use mask, redness (R), green (G), blue (B) luminescent layer film forming are become diaphragm area in each.As red (R), employing DCM1 styrene pigments such as (4-(dicyano methylene)-2-methyl-6-(4 '-dimethylamino styryl)-4H-pyrans) etc. sends the organic material of red light.As green (G), utilize quinoline aluminum complex (Alq
3) wait the organic material that sends green light.As blue (B), utilize diphenyl ethylene derivatives, triazole derivative etc. to send the organic material of blue light.Certainly, can utilize other materials, can be the layer structure of main body-object class, and luminous form also can be to utilize the luminous form of fluorescence luminescent material, also can be the luminous form of utilizing phosphorescent light-emitting materials.
About by the electron transfer layer of film forming on luminescent layer,, utilize for example quinoline aluminum complex (Alq through various film build methods such as resistance heating vapour deposition methods
3) wait various materials to carry out film forming.Electron transfer layer has the function with the electric transmission that is injected into from upper electrode line 3 to luminescent layer.This electron transfer layer can have only range upon range of 1 layer structure, also can have range upon range of sandwich construction more than 2 layers.In addition, electron transfer layer can form 1 layer rather than based on the film forming of homogenous material by a plurality of materials, also can be in the higher material of main part of charge transport ability the doping electric charge supply with the higher guest materials of (holding) property and form.
In the aforementioned operation 6, the 2nd electrode 12 is formed through vacuum evaporation etc.A wherein side of the 1st electrode 11 and the 2nd electrode 12 plays a role as anode and the opposing party plays a role as negative electrode.When being made as when substrate-side is taken out the top light emitting mode of light, the 1st electrode 11 adopts nesa coatings such as ITO.Negative electrode can adopt work function to be lower than the material of anode, when utilizing ITO as anode, can utilize magnesium alloys such as aluminium (Al) or Mg-Al as negative electrode.
Fig. 4 and Fig. 5 are the key diagrams of the various form examples of expression insulation wall 20.The overhang 20B that is formed on insulation wall 20 is meant the shape on the end that covers coating material layer 14, is not limited to the shape of side shown in Figure 2 21, can comprise various forms.
In the example shown in Fig. 4 (a), on the side 21 of insulation wall 20, be formed to the side-prominent protuberance 21a of coating material layer 14, the cross sectional shape of the insulation wall 20 before the hot briquetting is roughly T word shape.Insulation wall is the state of heating back (a2) from the preceding state variation of the heating and melting of (a1).(a2) in the state, cover side and the top part of coating material layer 14 in the insulation wall 20 and be formed overhang 20B.And, on coating material layer 14, be formed curved surface 22A.
In the example shown in Fig. 4 (b), be formed in the side 21 of insulation wall 20 to the side-prominent protuberance 21a1 of coating material layer 14, this protuberance 21a1 has the bight.Insulation wall is the state of heating back (b2) from the preceding state variation of the heating and melting of (b1).(b2) in the state, cover side and the top part of coating material layer 14 in the insulation wall 20 and be formed overhang 20B.And, on coating material layer 14, be formed curved surface 22A.
The cross sectional shape of insulation wall 20 need not left-right symmetric, and overhang 20B can only be formed at a side.Side 21 only has inclined plane 21a2 in a side among Fig. 4 (c).Insulation wall is the state of heating back (c2) from the preceding state variation of the heating and melting of (c1).(c2) in the state, cover side and the top part of coating material layer 14 in the insulation wall 20 and be formed overhang 20B.And, on coating material layer 14, be formed curved surface 22A.
The various cross sectional shapes of the insulation wall 20 before the heating and melting shown in Fig. 5.In the example of this figure (a), 21 a plurality of protuberance 21b1,21b2 have been formed from the side.In the example shown in this figure (b), the outstanding width of the protuberance 21c1 of a side and the protuberance 21c2 of opposition side is different.In the example shown in this figure (c), a side side 21 is formed inclined plane 21d1, the 21d2 of different angles therein, also is formed inclined plane 21d3, the 21d4 of different angles in the opposing party's side 21.In the example shown in this figure (d), only a side side 21 has been formed protuberance 21e therein.In the example shown in this figure (e), only be formed protuberance 21d on a side the side 21 therein, protuberance 21d has the bight.
Fig. 6～Fig. 9 is the key diagram of the formation example of the related organic EL panel of expression execution mode of the present invention.To part additional same-sign and the clipped repeat specification common with above stated specification.
(vertical view of removing the 2nd electrode of this figure (a) expression monomer panel, this figure (b) expression is formed the vertical view of a plurality of panels before cutting apart of large substrate to Fig. 6.) shown in example be the example that the outside of the light-emitting zone 10E on the substrate 10 in the organic EL panel 100 forms the pattern of insulation wall 20.Coating material layer 14 is formed by pattern through this insulation wall 20.The outside of light-emitting zone 10E in substrate 10 has been formed distribution zone 10F, on the 10F of this distribution zone, is formed the distribution 30 that is connected in the 1st electrode 11 or the 2nd electrode 12.In the organic EL panel 100, shown in Fig. 6 (b), can form a plurality of panels through on large substrate, forming a plurality of panels simultaneously and cutting with a series of operation along cut-off rule C1～C4.
Example shown in Fig. 7 (this figure (a) is for removing the vertical view of the 2nd electrode, and this figure (b) is the X-X sectional view of this figure (a) of comprising the 2nd electrode) is the example that the outside of the pixel 1G on the substrate 10 in the organic EL panel 100 forms insulation wall 20.Be formed pixel 1G by aforementioned organic EL 1, be formed insulation wall 20 along the outside of this pixel 1G.The 2nd electrode 12 spreads all over a plurality of pixel 1G and is formed, and the end is connected in distribution 30 through the 12S of contact portion.
(this figure (a) is a vertical view of removing the 2nd electrode to Fig. 8; This figure (b) is the X-X sectional view that comprises this figure (a) of the 2nd electrode) shown in example be that the outside of the pixel 1G on the substrate 10 in the organic EL panel 100 forms insulation wall 20, and form the example in electrode separation next door 30 with the function of separating the 2nd electrode 12 on the top of insulation wall 20.
Fig. 9 representes other form examples of insulation wall 20.The patterns of openings 20A of insulation wall 20 can take various form examples.Therefore insulation wall 20 can pattern become diversified shape, can be made as forms such as the digital fragment that is shown in Fig. 9 or icon.
In the related organic EL panel of this execution mode of the present invention; Through on the 1st electrode 11, forming coating material layer 14; The concavo-convex flattening surface that makes self by coating material layer 14 filling electrode surface; Therefore can realize being laminated in the homogenizing of the organic layer 13 on it, and can realize improving release-resistance etc. and improve luminescent properties or endurance quality.In addition, in the coating material that is applied on electrode, add acceptor (dopant), improve the electric charge injection efficiency thus, thereby can realize low-voltageization.
In addition; Medial surface surrounding coating material layer 14 insulation wall 20 on every side forms overhang 20B; Therefore can when making the flattening surface that is formed on the coating material layer 14 on the 1st electrode 11, carry out suitable pattern and form, and can improve the characteristics of luminescence of organic EL through making the organic layer 13 further homogenizing that are formed on it.Especially, can obtain the uniform characteristics of luminescence in the whole zone in patterns of openings 20A, and can improve the quality of organic EL panel 100.
And; In the insulation wall 20; The upper section of coating material layer 14 becomes successional inclined plane 22 or the curved surface 22A that guarantees the 2nd electrode 12; Therefore at coating material layer 14 laminated organic layer 13 and above that during film forming the 2nd electrode 12, can form the 2nd electrode 12 that does not have broken string, and can access the higher organic EL panel of reliability 100.
More than, with reference to accompanying drawing execution mode of the present invention is described in detail, but concrete structure is not limited to these execution modes, even if design alteration of the scope that does not break away from aim of the present invention etc. is arranged, also be contained among the present invention.And above-mentioned each execution mode just can flow the technology of using each other and make up as long as its purpose and structure etc. do not have special contradiction or problem.
Claims (8)
1. organic EL panel is characterized in that possessing:
Substrate;
The 1st electrode directly or through other layers is formed on this substrate;
The coating material layer is applied and is formed on said the 1st electrode;
Insulation wall, pattern form said coating material layer;
Organic layer is laminated on the said coating material layer and comprises luminescent layer; And
The 2nd electrode is formed on this organic layer,
Said insulation wall has the side that contacts with said coating material layer and suppresses the overhang of the diffusion of this coating material layer, and above said coating material layer, has successional inclined plane or the curved surface of guaranteeing said the 2nd electrode.
2. organic EL panel as claimed in claim 1 is characterized in that,
Said overhang is the inclined plane to said coating material layer tilt.
3. according to claim 1 or claim 2 organic EL panel is characterized in that,
Said insulation wall covers the side of said coating material layer and a top part.
4. like each described organic EL panel in the claim 1 to 3, it is characterized in that,
Said insulation wall is along the outside of the light-emitting zone of panel and be formed.
5. like each described organic EL panel in the claim 1 to 3, it is characterized in that,
Said insulation wall is along the outside of panel pixel and be formed.
6. organic EL panel as claimed in claim 5 is characterized in that,
Electrode separation next door with the function of separating said the 2nd electrode is formed at the top at said insulation wall.
7. the manufacturing approach of an organic EL panel is characterized in that, has:
On substrate, form the operation of the 1st electrode directly or through other layers;
In the operation that forms the pattern of insulation wall on the said substrate with the mode of surrounding the face that is applied on said the 1st electrode;
Said being applied in the pattern of said insulation wall is coated with the operation that coating material forms the coating material layer on the face;
The operation that comprises the organic layer of luminescent layer in said coating material layer laminated;
On said organic layer, form the operation of the 2nd electrode,
Said insulation wall has the overhang of the diffusion that suppresses said coating material layer at the inner face of said pattern; After forming said coating material layer; Make the upper section distortion of the said coating material layer in this insulation wall through this insulation wall of heating and melting, thereby form successional inclined plane or the curved surface of guaranteeing said the 2nd electrode.
8. the manufacturing approach of organic EL panel as claimed in claim 7 is characterized in that,
The cross sectional shape of said insulation wall before distortion is for roughly falling trapezoidal shape or T word shape roughly.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| PCT/JP2009/070774 WO2011070681A1 (en) | 2009-12-11 | 2009-12-11 | Organic el panel and method for manufacturing same |
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| CN102612858A true CN102612858A (en) | 2012-07-25 |
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| CN104882466A (en) * | 2015-05-27 | 2015-09-02 | 深圳市华星光电技术有限公司 | Organic luminescence display device |
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| CN108305891A (en) * | 2018-02-12 | 2018-07-20 | 上海天马微电子有限公司 | A kind of display panel and its manufacturing method, display device |
| US10581011B2 (en) | 2018-06-01 | 2020-03-03 | Int Tech Co., Ltd. | Light emitting device with different light emitting material overlapping width |
| TWI689117B (en) * | 2018-06-01 | 2020-03-21 | 創王光電股份有限公司 | Light emitting device |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2011070681A1 (en) | 2011-06-16 |
| JPWO2011070681A1 (en) | 2013-04-22 |
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