CN109950419B - OLED device packaging structure, display device and packaging method - Google Patents
OLED device packaging structure, display device and packaging method Download PDFInfo
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Abstract
The invention relates to the field of display, in particular to an OLED device packaging structure, a display device and a packaging method. The packaging structure of the OLED device comprises: a substrate; an OLED device disposed on the substrate; the composite catalyst layer is coated outside the OLED device and used for catalyzing water decomposition; the waterproof and breathable layer is coated outside the composite catalyst layer; and the mixed layer is coated outside the water-blocking breathable layer and is prepared from a mixture of a drying agent, a getter and catalyst type oxygen-removing resin. The packaging structure can effectively prevent or remove water and oxygen, ensure the drying of the electrode or the organic functional layer and prolong the service life of the OLED device.
Description
Technical Field
The invention relates to the field of display, in particular to an OLED device packaging structure, a display device and a packaging method.
Background
Because the OLED (Organic Light-Emitting Diode) has the advantages of simple structure, fast response speed, low power consumption, self-luminescence and the like, a display device manufactured by the OLED has very excellent display performance and has a wide application prospect.
However, one drawback of OLED display devices is their sensitivity to air and humidity. Most organic substances of the OLED light-emitting layer are pollutants in the atmosphere, O2And water vapor is very sensitive, so that the problems of deterioration, low luminous efficiency, abnormal light emission or incapability of emitting light and the like of the organic light-emitting material can be directly caused, and meanwhile, the oxidation and corrosion of the metal electrode can be caused, so that the stability and the service life of the OLED display device are directly influenced by the packaging technology.
Therefore, the research on an encapsulation method for removing water and oxygen in an OLED device system through effective encapsulation and effectively blocking the water and oxygen in the air has very important significance in the aspect of prolonging the service life of the device.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the packaging structure can effectively prevent or remove water and oxygen, ensure the drying of an electrode or an organic functional layer and prolong the service life of the OLED device.
The invention provides an encapsulation structure of an OLED device, which comprises:
a substrate;
an OLED device disposed on the substrate;
the composite catalyst layer is coated outside the OLED device and used for catalyzing water decomposition;
the waterproof and breathable layer is coated outside the composite catalyst layer;
and the mixed layer is coated outside the water-blocking breathable layer and is made of a mixture of a drying agent, a getter and catalyst type oxygen-removing resin.
Preferably, a closed first accommodating cavity is formed between the composite catalyst layer and the OLED device.
Preferably, a closed second accommodating cavity is formed between the water-blocking and air-permeable layer and the mixing layer.
Preferably, the composite catalyst layer is an ultraviolet up-conversion luminescent material doped with titanium dioxide.
Preferably, the ultraviolet up-conversion luminescent material is Er3+：NaYF4、40CdF2·60BaF2·1.6Er2O3、Er3+：Y3Al5O12Or Er3+：Y2O3。
Preferably, the water-blocking breathable layer is formed by blending polyurethane and polyvinylidene fluoride.
Preferably, the catalytic oxygen-removing resin is a strong base anion exchange resin with palladium coated on the surface.
The invention provides a display device which is characterized by comprising the OLED device packaging structure in the technical scheme.
The invention also provides an encapsulation method of the OLED device, which comprises the following steps:
providing a substrate;
forming an OLED device on the substrate;
forming a composite catalyst layer coated outside the OLED device for catalyzing water decomposition;
forming a water-blocking and air-permeable layer coated outside the composite catalyst layer;
and forming a mixed layer coated outside the water-blocking and air-permeable layer, wherein the mixed layer is prepared from a mixture of a drying agent, a getter and catalyst type oxygen-removing resin.
Preferably, when the composite catalyst layer coated outside the OLED device for catalyzing water decomposition is formed, a closed first accommodating cavity is formed between the composite catalyst layer and the OLED device.
Preferably, when a mixed layer coated outside the water-blocking breathable layer is formed, a closed second accommodating cavity is formed between the water-blocking breathable layer and the mixed layer.
Compared with the prior art, the packaging structure of the OLED device comprises:
a substrate;
an OLED device disposed on the substrate;
a composite catalyst layer coating the OLED device, the composite catalyst layer being for catalyzing water decomposition;
the waterproof and breathable layer is coated outside the composite catalyst layer;
and the mixed layer is coated outside the water-blocking breathable layer and is made of a mixture of a drying agent, a getter and catalyst type oxygen-removing resin.
According to the invention, the composite catalyst layer is used for catalyzing water in the OLED device to be decomposed into hydrogen and oxygen, and the generated hydrogen and oxygen reach the mixed layer after passing through the water-blocking and air-permeable layer in a diffusion manner; the catalyst type oxygen-removing resin in the mixed layer has stronger oxygen and hydrogen adsorption force and can catalyze hydrogen and oxygen to regenerate water; the regenerated water is absorbed by the drying agent in the mixed layer, so that the effect of removing water is achieved. Meanwhile, the mixed layer also comprises a getter which can be used for absorbing oxygen introduced in the manufacturing process. The combined use of the composite catalyst layer and the mixed layer can ensure that the water and oxygen removal process is circularly and continuously carried out, not only can remove water and oxygen introduced in the preparation process of the OLED device, but also can avoid the external water and oxygen from entering, thereby ensuring the drying of an electrode or an organic functional layer and prolonging the service life of the OLED device.
Drawings
FIG. 1 is a schematic diagram of an OLED device package structure made according to one embodiment of the present invention;
FIG. 2 is a schematic diagram of an OLED device package structure made according to another embodiment of the present invention;
legends note:
the OLED device comprises a substrate 1, an OLED device 2, a composite catalyst layer 3, a water-blocking and air-permeable layer 4, a mixed layer 5, a first accommodating cavity 6 and a second accommodating cavity 7.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention in conjunction with the following examples, but it will be understood that the description is intended to illustrate the features and advantages of the invention further, and not to limit the invention.
The embodiment of the invention discloses an encapsulation structure of an OLED device, which comprises:
a substrate;
an OLED device disposed on the substrate;
the composite catalyst layer is coated outside the OLED device and used for catalyzing water decomposition;
the waterproof and breathable layer is coated outside the composite catalyst layer;
and the mixed layer is coated outside the water-blocking breathable layer and is made of a mixture of a drying agent, a getter and catalyst type oxygen-removing resin.
According to the invention, the OLED device is packaged by the triple structure, so that water and oxygen in the packaging process are effectively removed, and the water and oxygen in the air are effectively prevented from entering the packaging structure, so that the OLED device has a better effect in the aspect of prolonging the service life of the OLED device.
In the present invention, the substrate may be any substrate used in the art, and for OLED flexible display, the substrate may be a high molecular polymer substrate, an ultra-thin glass substrate, or a metal sheet substrate.
The OLED device is formed by overlapping functional layers.
In the present invention, the method further comprises: and the composite catalyst layer is coated outside the OLED device. The composite catalyst layer is used for catalyzing water decomposition. Preferably, the composite catalyst layer is an ultraviolet up-conversion luminescent material doped with titanium dioxide. The ultraviolet light can improve the activity of the titanium dioxide photocatalyst, and the ultraviolet up-conversion material can absorb the light on the non-light-emitting side of the OLED device and convert the light into the ultraviolet light. Under the irradiation of ultraviolet light, the titanium dioxide can catalyze the water in the OLED device to be decomposed into hydrogen and oxygen. The substrate of the ultraviolet up-conversion luminescent material is preferably fluoride or oxide. More preferably, the ultraviolet up-conversion luminescent material is Er3+：NaYF4、40CdF2·60BaF2·1.6Er2O3、Er3+：Y3Al5O12Or Er3+：Y2O3。
The composite catalyst layer has the following embodiments:
1. ultraviolet upconversion of fluoride substratesAnd (3) mixing the photocatalyst: er3+：NaYF4Composite TiO2Or 40CdF2·60BaF2·1.6Er2O3Composite TiO2。
2. Ultraviolet up-conversion composite photocatalyst of oxide matrix: er3+：Y3Al5O12Composite TiO2Or Er3+：Y2O3Composite TiO2。
Preferably, a closed first accommodating cavity is formed between the composite catalyst layer and the OLED device.
The water-blocking and air-permeable layer is coated outside the composite catalyst layer and can allow gas to permeate through, and water is poor in volatility and difficult to pass through. Preferably, the water-blocking breathable layer is formed by blending polyurethane and polyvinylidene fluoride. And hydrogen and oxygen generated by catalysis of the composite catalyst layer are diffused outwards through the water-blocking and air-permeable layer.
The mixed layer is coated outside the water-blocking and air-permeable layer and is made of a mixture of a drying agent, a getter and catalyst type oxygen-removing resin. Preferably, the catalytic oxygen-removing resin is a strong base anion exchange resin with palladium coated on the surface. The drying agent is preferably activated molecular sieve or activated carbon. The getter may be titanium, zirconium, tantalum or thorium. Palladium has a very strong adsorption effect on hydrogen and oxygen and has a very high catalytic activity. The hydrogen and the oxygen diffused through the water-blocking and air-permeable layer are re-synthesized into water at the mixed layer. Water generated in the process is absorbed by the drying agent in the mixed layer, and oxygen introduced in the manufacturing process of the OLED device is absorbed by the getter in the mixed layer, so that the aim of removing the water and the oxygen is fulfilled. In addition, the mixed layer and the water-blocking and air-permeable layer can also prevent external oxygen and water vapor from entering the OLED device.
The waterproof breathable layer and the mixed layer can be closely adjacent, and preferably, a closed second accommodating cavity is formed between the waterproof breathable layer and the mixed layer. In the second containing cavity, hydrogen and oxygen generate water so as to be absorbed by the desiccant in the mixed layer.
In the invention, the composite catalyst layer decomposes water in the packaging structure to generate oxygen and hydrogen, the hydrogen and the oxygen in the mixed layer are regenerated into water and then absorbed, and the excess oxygen can be absorbed; the two film layers act synergistically and can act circularly and continuously to ensure that the OLED device can avoid the erosion of water and oxygen in the whole life cycle.
Due to the existence of the water-blocking breathable layer and the mixed layer, external water can be effectively prevented from entering the OLED device. Even under extreme conditions, for example: the desiccant in the mixed layer absorbs water to be saturated or loses efficacy, and the packaging structure can also ensure that water in the packaging structure is carried out of the water-blocking and air-permeable layer in a gas form after being decomposed by photocatalysis, so that the water in the contact part of the packaging structure and the OLED device is removed. The oxygen removal process inside the packaging structure is not affected, so that oxygen inside the packaging structure can be continuously removed.
The embodiment of the invention discloses a display device which comprises the OLED device packaging structure in the technical scheme.
The display device may be: the display device comprises any product or component with a display function, such as a liquid crystal television, a liquid crystal display, a digital photo frame, a mobile phone, a tablet personal computer and the like, wherein the display device further comprises a flexible circuit board, a printed circuit board and a back plate.
The embodiment of the invention also discloses an encapsulation method of the OLED device, which comprises the following steps:
providing a substrate;
forming an OLED device on the substrate;
forming a composite catalyst layer coated outside the OLED device for catalyzing water decomposition;
forming a water-blocking and air-permeable layer coated outside the composite catalyst layer;
and forming a mixed layer coated outside the water-blocking and air-permeable layer, wherein the mixed layer is prepared from a mixture of a drying agent, a getter and catalyst type oxygen-removing resin.
The packaging method of the OLED device is explained in detail according to the steps;
s1: providing a substrate;
the substrate may be any substrate used in the art, and for OLED flexible displays, the substrate may be a high molecular polymer substrate, an ultra-thin glass substrate, or a metal foil substrate.
S2: forming an OLED device on the substrate;
the OLED device is formed by overlapping functional layers.
S3: forming a composite catalyst layer coated outside the OLED device for catalyzing water decomposition;
preferably, the composite catalyst layer is an ultraviolet up-conversion luminescent material doped with titanium dioxide. The composite catalyst layer is coated outside the OLED device in a coating mode and the like to form a closed structure.
Preferably, a closed first accommodating cavity is formed between the composite catalyst layer and the OLED device.
S4: forming a water-blocking and air-permeable layer coated outside the composite catalyst layer;
the water-blocking breathable layer is preferably formed by blending polyurethane and polyvinylidene fluoride. The waterproof breathable layer is coated outside the composite catalyst layer in a coating mode, a spraying mode and the like.
S5: and forming a mixed layer coated outside the water-blocking and air-permeable layer, wherein the mixed layer is prepared from a mixture of a drying agent, a getter and catalyst type oxygen-removing resin.
Preferably, when a mixed layer coated outside the water-blocking breathable layer is formed, a closed second accommodating cavity is formed between the water-blocking breathable layer and the mixed layer.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (11)
1. An encapsulation structure of an OLED device, comprising:
a substrate;
an OLED device disposed on the substrate;
the composite catalyst layer is coated outside the OLED device and used for catalyzing water decomposition;
the waterproof and breathable layer is coated outside the composite catalyst layer;
and the mixed layer is coated outside the water-blocking breathable layer and is made of a mixture of a drying agent, a getter and catalyst type oxygen-removing resin.
2. The encapsulation structure of claim 1, wherein the composite catalyst layer and the OLED device form a closed first cavity therebetween.
3. The package structure according to claim 1, wherein a second closed accommodating cavity is formed between the water-blocking and air-permeable layer and the mixed layer.
4. The package structure according to any one of claims 1 to 3, wherein the composite catalyst layer is an ultraviolet upconversion luminescent material doped with titanium dioxide.
5. The package structure of claim 4, wherein the UV upconversion luminescent material is Er3+：NaYF4、40CdF2·60BaF2·1.6Er2O3、Er3+：Y3Al5O12Or Er3+：Y2O3。
6. The packaging structure of claim 1, wherein the water-blocking and breathable layer is blended from polyurethane and polyvinylidene fluoride.
7. The package structure according to claim 1, wherein the catalytic oxygen-scavenging resin is a strong base anion exchange resin coated with palladium.
8. A display device, comprising the OLED device package structure of any one of claims 1 to 7.
9. The packaging method of the OLED device is characterized by comprising the following steps:
providing a substrate;
forming an OLED device on the substrate;
forming a composite catalyst layer coated outside the OLED device for catalyzing water decomposition;
forming a water-blocking and air-permeable layer coated outside the composite catalyst layer;
and forming a mixed layer coated outside the water-blocking and air-permeable layer, wherein the mixed layer is prepared from a mixture of a drying agent, a getter and catalyst type oxygen-removing resin.
10. The encapsulation method according to claim 9, wherein when the composite catalyst layer for catalyzing water decomposition is formed to cover the outside of the OLED device, a closed first accommodating chamber is formed between the composite catalyst layer and the OLED device.
11. The packaging method according to claim 9, wherein when a mixed layer is formed to cover the water-blocking and air-permeable layer, a second closed accommodating cavity is formed between the water-blocking and air-permeable layer and the mixed layer.
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| ITMI20012010A1 (en) * | 2001-09-27 | 2003-03-27 | Getters Spa | SYSTEMS FOR THE CONVERSION OF WATER INTO HYDROGEN AND THE ABSORPTION OF HYDROGEN IN ELECTRONIC DEVICES AND PRODUCTION PROCESS |
| JP2006318876A (en) * | 2004-06-29 | 2006-11-24 | Dainippon Printing Co Ltd | Electroluminescent element and manufacturing method thereof |
| WO2008082362A1 (en) * | 2006-12-28 | 2008-07-10 | Agency For Science, Technology And Research | Encapsulated device with integrated gas permeation sensor |
| EP2281420B1 (en) * | 2008-04-09 | 2014-10-15 | Agency for Science, Technology And Research | Multilayer film for encapsulating oxygen and/or moisture sensitive electronic devices |
| CN203218330U (en) * | 2013-04-01 | 2013-09-25 | 中国科学院福建物质结构研究所 | LED water photolysis device |
| CN105742327B (en) * | 2016-02-15 | 2018-12-07 | 京东方科技集团股份有限公司 | A kind of OLED display and preparation method thereof |
| CN108155302B (en) * | 2018-01-31 | 2020-05-08 | 京东方科技集团股份有限公司 | Organic light-emitting display panel and preparation method thereof |
| CN108899436B (en) * | 2018-06-29 | 2020-03-06 | 京东方科技集团股份有限公司 | Packaging structure, display panel, display device and manufacturing method thereof |
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