CN1708195A - Organic electroluminescent display elements - Google Patents
Organic electroluminescent display elements Download PDFInfo
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- CN1708195A CN1708195A CN 200510070211 CN200510070211A CN1708195A CN 1708195 A CN1708195 A CN 1708195A CN 200510070211 CN200510070211 CN 200510070211 CN 200510070211 A CN200510070211 A CN 200510070211A CN 1708195 A CN1708195 A CN 1708195A
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Abstract
The present invention relates to one kind of organic electroluminescent display device. The device includes one anode, one organic light emitting layer on the anode; one transparent layer on the organic light emitting layer; one protecting layer on the transparent layer; one anti-reflection layer on the protecting layer and one cathode on the anti-reflection layer.
Description
Technical field
The present invention relates to a kind of organic electric-excitation luminescent Display Technique, particularly relate to a kind of organic electroluminescent display device and preparation method thereof with preferable contrast expression (contrast).
Background technology
Organic electric-excitation luminescent shows (Organic Electro-Luminescence display, OELD) element has luminous slim of face, feature in light weight and self luminous high-luminous-efficiency, advantages such as low driving voltage, and according to the material of the organic film material of organic electroluminescent display device, organic electroluminescent display device can be divided into micromolecule element (molecule-based device) and macromolecule element (polymer-based device) two classes, wherein the micromolecule element is called as OLED (organic lightemitting display), be to be material with dye well pigment, and macromolecule element is called as PLED (polymer light emitting display), is to be material with the conjugated polymer.
The structure of existing organic electroluminescent display device, with the OLED element is example, is made up of the retes such as anode conductive layer, hole injection layer, hole transmission layer, luminous organic material layer, electron transfer layer, electron injecting layer and cathode conductive layer that are formed in regular turn on the substrate usually.Wherein, hole injection layer, hole transmission layer and luminous organic material layer are commonly referred to as a luminescent layer.And anode conductive layer adopts indium tin oxide (In usually
2O
3: Sn abbreviates ITO as), it has advantages such as easy etching, low film formation temperature, low resistance.When the OLED element after applying bias, electronics, hole enter in the luminous organic material layer through the electron transfer layer in the luminescent layer, hole transmission layer respectively and are combined into an exciton (exciton), again energy is discharged and get back to ground state (ground state), in the energy that is released at these, can the pattern with different colours light discharge according to the difference of selected luminescent material, for example: ruddiness (R), green glow (G), blue light (B).Generally speaking, photoemissive direction is emitted toward orientation substrate by anode tap.
Yet in order to promote radiative brightness, cathode conductive layer uses highly reflective material usually.Therefore, so the cathode conductive layer of high reflectance has also reflected by anode conductive layer and has entered part external environment light in the OLED element.Yet, under indoor or outdoor high level ambient light irradiation as a large amount of illumination, the light emissive porwer that often surpasses the OLED element for the intensity of the cathode conductive layer institute reflected ambient line that adopts highly reflective material, thereby reduce image contrast by the imaging of OLED element, and can't clearly present actual image.
Summary of the invention
Main purpose of the present invention is to propose a kind of electroluminescent display device, between luminescent layer and cathode conductive layer, provide a reflection to suppress structure, to improve in the organic electroluminescent display device cathode conductive layer for the reflection situation of ambient light, and then improve the contrast of display element, thereby be applicable to complete dark to a large amount of inferior different environments for use of illumination.
In an embodiment, the invention provides a kind of organic electroluminescent display device, comprising:
One anode; One organic luminous layer is positioned on this anode; Part photic zone is positioned on this organic luminous layer; One protective layer is positioned on this part photic zone; One reflection suppresses layer, is positioned on this protective layer; And a negative electrode, be positioned at this reflection and suppress on the layer.
The present invention provides a kind of manufacture method of organic electroluminescent display device in an embodiment, its step comprises:
One substrate is provided; Form an anode on the part of this substrate; Form an organic luminous layer on this anode; Form a part of photic zone on this organic luminous layer; Form a protective layer on this part photic zone; Form a reflection and suppress layer on this protective layer; And form a negative electrode on this reflection inhibition layer, wherein this protective layer has prevented when forming this reflection inhibition layer for the euphotic oxidation of this part.
In an embodiment, a kind of display unit of electroluminescent display device comprises:
One display floater, it is provided with at least one organic electroluminescent display device, and a controller, is coupled to this display floater, and to drive this display floater and to present an image according to an input signal, wherein this organic illuminated display element comprises:
One anode; One organic luminous layer is positioned on this anode; Half photic zone is positioned on this organic luminous layer; One protective layer is positioned on this semi-transparent photosphere; One reflection suppresses layer, is positioned on this protective layer; And a negative electrode, be positioned at this reflection and suppress on the layer.
For above and other objects 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. 1～2 are a series of profiles, in order to the structure of explanation according to the organic electroluminescent display device of the preferred embodiments of the present invention;
Fig. 3 is a flow chart, in order to the manufacture method of explanation according to the organic electroluminescent display device of the preferred embodiments of the present invention;
Fig. 4 is a schematic diagram, and in order to the display unit of diagram one embodiment of the invention, it comprises a controller.
The simple symbol explanation
100～substrate;
102～anode conductive layer;
104～luminescent layer;
106～part photic zone;
108,114～protective layer;
110～reflection suppresses layer;
112～cathode conductive layer;
200～display floater;
202～controller;
204～display unit.
Embodiment
The preferred embodiments of the present invention will cooperate Fig. 1 to Fig. 4 do one be described in detail as follows
At first as shown in Figure 1; demonstration is according to a preferred embodiment of organic electroluminescent display device of the present invention; it comprises that the anode conductive layer 102, luminescent layer 104, part photic zone 106, protective layer 108, the reflection that are formed in regular turn on the substrate 100 suppress layer 110, and cathode conductive layer 112.Substrate 100 for example is a transparent glass substrate, can be formed with other active element (as thin-film transistor) or other metallic circuit on substrate 100, this only icon be a smooth substrate.For simplicity of illustration, only illustrating in this luminescent layer 104 is a single rete, and those skilled in the art in fact also comprise retes such as a hole injection layer, hole transmission layer and luminous material layer when understanding luminescent layer 104.The material of luminescent layer 104 for example is an organic material.When being applied to the OLED element, luminescent layer 104 is made up of micromolecular organic material, and when being applied to the PLED element, luminescent layer 104 is made up of macromolecular organic material.In addition, please refer to Fig. 2, can also be provided with another protective layer 114, to avoid the structure of influence reflection inhibition layer when forming cathode conductive layer 112 in cathode conductive layer 112 and 110 on reflection inhibition layer.
Generally speaking, 102 indium tin oxide (In that adopt advantages such as the easy etching of tool, low film formation temperature, low resistance usually of anode conductive layer
2O
3: Sn abbreviates ITO as).But, anode conductive layer also can adopt other material as indium-zinc oxide (IZO).In addition, part photic zone 106 for example is a thin metal layer of aluminum metal, and it has the thickness between 50～150 dusts, and it has approximately the light transmittance between 70～90%, can appropriateness reduce the light quantity that is incident to cathode conductive layer 112.In addition, protective layer 108 and 114 material for example are the organic material of CuPc (CuPc), and its thickness is about the thickness of 50～1000 dusts; And the material of reflection inhibition layer 110 for example is semi-conducting material, zinc oxide, zinc sulphide, calcium boride (CaB through n type doping impurity
6) or nitrogenize lanthanum (LaN), its thickness is about 100～3000 dusts.
Compared to existing organic electroluminescent display device; in Fig. 1 of the present invention and organic electroluminescent display device shown in Figure 2; when ambient light goes into to inject by part photic zone 106; when protective layer 108 and reflection suppress composite film that layer 110 formed; ambient light can reduce its luminous intensity earlier in advance via part photic zone 106; and by suppressing the optical interference effects (optical interference effect) that layer was produced at 110 o'clock by reflection; destruction interference effect for example; be the reflectivity of cathode conductive layer 112 and reduced, therefore promoted the contrast performance of the organic electroluminescent element of present embodiment for ambient light.
In present embodiment, above-mentioned composite film is in presenting pitch-dark color in appearance substantially and having conductive characteristic.In addition; in manufacture process; part photic zone 106 and reflection suppress between the layer 110 protective layer 108 and optionally reflection suppress layer 110 and 114 of protective layers between the cathode conductive layer 112 can protect part photic zone 106 when subsequent reflection suppresses layer 110 and forms and the protection reflection avoid being subjected to the destruction of the oxidation in the technology when suppressing layer 110 in follow-up cathode conductive layer 112 formation, and then guaranteed the reflection inhibitory action and the component structure of composite film.Therefore, the organic electroluminescent display device of present embodiment has preferred element reliability, and can comparatively prolong its useful life.
Manufacture method as Fig. 1 and organic electroluminescent display device shown in Figure 2 then is illustrated by the flow chart of Fig. 3.Please refer to Fig. 3, at first, provide a substrate, the substrate 100 shown in for example in Fig. 1 and Fig. 2 in shown in the step S1.At this, can be formed with active element or other metallic circuit on substrate 100 substrates as thin-film transistor (TFT).Then, in step S2, then form an anode conductive layer on the substrate of part.Physical vaporous deposition formation one deck anode conducting material of sputtering method is at first passed through as is in the formation of anode conductive layer, it for example is indium tin oxide, and define this anode conducting material by a follow-up photoetching/etching process, on the substrate of part, to form an anode conductive layer.Then, then by evaporation with and/or method such as sputter, and collocation is fit to the use of shielding (shielding mask), forming a part of photic zone, a protective layer and a reflection in regular turn on anode conductive layer suppresses layer, as described in step S3-S5.Then, shown in step S6, can also optionally form another protective layer and suppress on the layer in reflection.At this, the formation method of protective layer is preferably vapour deposition method.At last, a cathode conductive layer that forms as aluminum by the physics device phase depositional mode as sputtering method suppresses on the layer in protective layer or reflection, and then finishes the manufacturing of organic electroluminescent display device of the present invention.
In manufacture method as shown in Figure 3; part photic zone and reflection suppress the protective layer between the layer and optionally be formed at reflection suppress protective layer between layer and the cathode conductive layer have protection part photic zone when subsequent reflection suppresses layer and forms and the protection reflection suppress layer and when follow-up cathode conductive layer forms, avoid being subjected to the destruction of oxidation, and then guaranteed the reflection inhibitory action and the component structure of composite film.Therefore, guaranteed element reliability and useful life by the formed organic electroluminescent display device of above-mentioned technology.
Please refer to the schematic diagram of Fig. 4, an embodiment who has shown the display floater 200 of using above-mentioned organic electroluminescent display device, display floater 200 for example is an organic electric-excitation luminescent displaying panel, and coupling by a controller 202, and form display unit 204, and present an image according to an input signal (not shown).Wherein, display floater 200 can comprise a pair of plate (not shown) of the substrate 100 that relatively is arranged at organic electroluminescent display device.202 of controllers can comprise in order to control display unit 200 and the source electrode that is used for operation display panel 204 with gate driver circuit (not icon).Since in the display floater 200 to adopt aforementioned organic electroluminescent display device, so do not need to use other display element that additionally is used to improve contrast in the display floater as Polarizer with preferred contrast expression.Therefore, can more reduce the manufacturing cost and the process time of display floater 200.
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 can do a little change and retouching without departing from the spirit and scope of the present invention, thus protection scope of the present invention should with accompanying Claim the person of being defined be as the criterion.
Claims (13)
1, a kind of organic electroluminescent display device comprises:
One anode;
One organic luminous layer is positioned on this anode;
Part photic zone is positioned on this organic luminous layer;
One protective layer is positioned on this part photic zone;
One reflection suppresses layer, is positioned on this protective layer; And
One negative electrode is positioned at this reflection and suppresses on the layer.
2, organic electroluminescent display device as claimed in claim 1 also comprises one second protective layer, is arranged at this negative electrode and this reflection and suppresses between the layer.
3, organic electroluminescent display device as claimed in claim 1, wherein this anode comprises indium tin oxide.
4, organic electroluminescent display device as claimed in claim 1, wherein this part photic zone comprises aluminium.
5, organic electroluminescent display device as claimed in claim 1, wherein this protective layer comprises organic material.
6, organic electroluminescent display device as claimed in claim 5, wherein this organic material is a CuPc.
7, organic electroluminescent display device as claimed in claim 1, wherein this reflection inhibition layer comprises semi-conducting material, zinc oxide, zinc sulphide, calcium boride or the nitrogenize lanthanum through n type doping impurity.
8, organic electroluminescent display device as claimed in claim 2, wherein this second protective layer comprises organic material.
9, organic electroluminescent display device as claimed in claim 8, wherein this organic material is a CuPc.
10, organic electroluminescent display device as claimed in claim 1, wherein this part photic zone has the thickness of cardinal principle between 50～150 dusts.
11, organic electroluminescent display device as claimed in claim 1, wherein this protective layer has the thickness of cardinal principle between 50～1000 dusts.
12, organic electroluminescent display device as claimed in claim 1, wherein this reflection inhibition layer has the thickness of cardinal principle between 100～3000 dusts.
13, organic electroluminescent display device as claimed in claim 2, wherein this second protective layer has the thickness of cardinal principle between 50～1000 dusts.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100702113A CN100369288C (en) | 2005-05-11 | 2005-05-11 | Organic electroluminescent display elements |
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|---|---|---|---|
| CNB2005100702113A CN100369288C (en) | 2005-05-11 | 2005-05-11 | Organic electroluminescent display elements |
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| CN1708195A true CN1708195A (en) | 2005-12-14 |
| CN100369288C CN100369288C (en) | 2008-02-13 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104124374A (en) * | 2013-04-24 | 2014-10-29 | 海洋王照明科技股份有限公司 | Organic light-emitting device and preparation method thereof |
| CN104393180A (en) * | 2014-10-17 | 2015-03-04 | 京东方科技集团股份有限公司 | Organic light-emitting diode and preparation method thereof, display substrate, and display apparatus |
| JP2015534230A (en) * | 2012-09-28 | 2015-11-26 | オーシャンズ キング ライティング サイエンスアンドテクノロジー カンパニー リミテッド | Organic electroluminescence device and manufacturing method thereof |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6411019B1 (en) * | 1999-07-27 | 2002-06-25 | Luxell Technologies Inc. | Organic electroluminescent device |
| US6429451B1 (en) * | 2000-05-24 | 2002-08-06 | Eastman Kodak Company | Reduction of ambient-light-reflection in organic light-emitting devices |
| US7071613B2 (en) * | 2001-10-10 | 2006-07-04 | Lg.Philips Lcd Co., Ltd. | Organic electroluminescent device |
| CN1280925C (en) * | 2003-01-17 | 2006-10-18 | 友达光电股份有限公司 | Organic light-emitting dipolar body fer lowering external light reflection and its manufacturing process |
-
2005
- 2005-05-11 CN CNB2005100702113A patent/CN100369288C/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015534230A (en) * | 2012-09-28 | 2015-11-26 | オーシャンズ キング ライティング サイエンスアンドテクノロジー カンパニー リミテッド | Organic electroluminescence device and manufacturing method thereof |
| CN104124374A (en) * | 2013-04-24 | 2014-10-29 | 海洋王照明科技股份有限公司 | Organic light-emitting device and preparation method thereof |
| CN104393180A (en) * | 2014-10-17 | 2015-03-04 | 京东方科技集团股份有限公司 | Organic light-emitting diode and preparation method thereof, display substrate, and display apparatus |
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| Publication number | Publication date |
|---|---|
| CN100369288C (en) | 2008-02-13 |
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