CN113871546A - OLED display panel, manufacturing method thereof and light-emitting device - Google Patents
OLED display panel, manufacturing method thereof and light-emitting device Download PDFInfo
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- CN113871546A CN113871546A CN202111086432.5A CN202111086432A CN113871546A CN 113871546 A CN113871546 A CN 113871546A CN 202111086432 A CN202111086432 A CN 202111086432A CN 113871546 A CN113871546 A CN 113871546A
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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
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/126—Shielding, e.g. light-blocking means over the TFTs
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/84—Passivation; Containers; Encapsulations
- H10K50/842—Containers
- H10K50/8426—Peripheral sealing arrangements, e.g. adhesives, sealants
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
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Abstract
An OLED display panel and a manufacturing method thereof are provided, wherein the OLED display panel comprises a substrate, an OLED device, a thin film packaging layer and a cover plate. The OLED panel comprises a substrate, a thin film transistor layer, an OLED device, a thin film packaging layer, a surface adhesive and a cover plate, wherein the substrate is provided with the thin film transistor layer, the OLED device is arranged on the thin film transistor layer, the thin film packaging layer is arranged on the OLED device and packages the OLED device, the surface adhesive is arranged on one side surface of the cover plate, the surface adhesive corresponds to one side surface of the OLED device, and a nano microstructure is arranged on the side surface of the OLED device and is pressed on the substrate and the cover plate, so that the microcavity effect and the total reflection of the OLED panel can be effectively reduced, the light extraction of the panel is improved, and the visual angle of the panel is improved. The invention also provides a light-emitting device.
Description
Technical Field
The invention relates to the field of manufacturing of organic electroluminescent displays, in particular to an OLED display panel applied to top-emitting OLEDs, a manufacturing method of the OLED display panel and a light-emitting device.
Background
The Organic Light-Emitting Diode (OLED) display has the advantages of self-luminescence, no need of a backlight source, high contrast, wide color gamut, thin thickness, high reaction speed, capability of being used for a flexible panel and the like, and particularly, the top-Emitting OLED panel has the advantages of high aperture ratio and the like, so that the OLED display is considered to be a new technology for next-generation flat panel display. However, since the top-emitting OLED panel has a severe microcavity effect and total reflection, the light extraction and viewing angle of the panel are greatly affected.
OLEDs can be classified into three types according to the light emitting direction, i.e., bottom-emitting 0 LEDs, top-emitting OLEDs, and double-sided emitting OLEDs. Bottom-emitting OLEDs refer to OLEDs where light exits the substrate, double-emitting OLEDs refer to 0 LEDs where light exits both the substrate and the top of the device, and top-emitting OLEDs refer to 0 LEDs where light exits the top of the device. The top-emitting OLED is not influenced by whether the substrate is transparent or not, so that the aperture opening ratio of the display panel can be effectively improved, the design of a TFT circuit on the substrate is expanded, the selection of electrode materials is enriched, and the integration of a device and the TFT circuit is facilitated. Because the OLED is very sensitive to water vapor and oxygen, the water vapor and the oxygen permeating into the OLED can corrode an organic functional layer and an electrode material, and the service life of a device is seriously influenced, so that in order to prolong the service life of the device and improve the stability of the device, the OLED needs to be packaged to form an OLED packaging structure, specifically, surface-mounted packaging is a common packaging mode, an upper glass substrate and a lower glass substrate are bonded through surface-mounted glue, the surface-mounted glue is in a semi-flowing state, the surface-mounted glue can be heated and cured after being bonded, and the glue material covers the whole surface of the OLED device. Therefore, there is a need for an encapsulation design that improves the light extraction and viewing angle of existing OLED panels, which is the direction of optimization of the present invention.
Disclosure of Invention
The invention aims to provide an OLED display panel, a manufacturing method thereof and a light-emitting device, wherein a short-range ordered nano microstructure is formed on a surface adhesive, and the micro-cavity effect and total reflection of the OLED panel can be effectively reduced, so that the light extraction of the panel is improved, and the visual angle of the panel is improved.
In order to achieve the above objects, the present invention provides an OLED display panel and a method for fabricating the same, wherein the OLED display panel includes a substrate, an OLED device, a thin film encapsulation layer, and a cover plate. The OLED device comprises a substrate, a thin film transistor layer, an OLED device, a thin film packaging layer, a cover plate and a nano-micro structure, wherein the substrate is provided with the thin film transistor layer, the OLED device is arranged on the thin film transistor layer, the thin film packaging layer is arranged on the OLED device and packages the OLED device, a surface adhesive is arranged on one side of the cover plate, which faces the substrate, a nano-micro structure is arranged on one side of the surface adhesive, which corresponds to the OLED device, and the substrate and the cover plate are pressed.
Preferably, the projection length of the nano-microstructure on the substrate is greater than or equal to the projection length of the OLED device on the substrate, the nano-microstructure includes cellulose nanofibers and the cellulose nanofibers are prepared by using one of silicon-based polymers, epoxy resins and polyacrylamide resins.
Preferably, the cellulose nanofibers are distributed on the side surface of the surface adhesive in a plurality of rows of straight lines, uniformly and in short-range order, and the diameter range of the cellulose nanofibers comprises 10 nanometers to 100 nanometers.
Preferably, the surface is adhered with the whole surface and completely covers the film packaging layer.
The invention also provides a manufacturing method of the OLED display panel, which comprises the following steps:
providing a substrate, and manufacturing a thin film transistor layer on the substrate;
forming an OLED device on the thin-film transistor layer;
preparing a thin film packaging layer on the OLED device and packaging the OLED device;
providing a cover plate, and manufacturing surface bonding glue on one side surface of the cover plate;
manufacturing a nano microstructure on one side surface of the surface adhesive corresponding to the OLED device; and
and pressing the substrate and the cover plate.
Preferably, the projection length of the nano-microstructure on the substrate is greater than or equal to the projection length of the OLED device on the substrate, the nano-microstructure includes cellulose nanofibers and the cellulose nanofibers are prepared by using one of silicon-based polymers, epoxy resins and polyacrylamide resins.
Preferably, the cellulose nanofibers are distributed on the side surface of the surface adhesive in a plurality of rows in a straight line, uniformly and in a short-range order, the cellulose nanofibers are sprayed on the side surface of the surface adhesive corresponding to the OLED device by electrostatic spraying or spray air gun, and the diameter range of the cellulose nanofibers includes 10 nm to 100 nm.
Preferably, in the step of laminating the substrate and the cover plate, the substrate and the cover plate are further laminated by vacuum, and the surface adhesive is cured by heating to form the OLED display panel.
Preferably, when the thin film encapsulation layer is prepared, a water-blocking thin film is further manufactured by adopting plasma enhanced chemical vapor deposition or atomic layer deposition to encapsulate the OLED device, and the thin film transistor layer is an indium gallium zinc oxide thin film transistor.
Furthermore, the present invention also provides a display device, such as the OLED display panel according to the above embodiments.
The invention also has the following effects that firstly, the IGZO-TFT is manufactured on one side of the substrate, then the top-emitting OLED device is manufactured, and then the water-resistant thin film packaging layer is manufactured by PECVD or ALD to carry out thin film packaging on the OLED device. Attaching a surface adhesive on one side surface of the cover plate facing the substrate, spraying a nano microstructure (cellulose nanofiber) on the surface adhesive through electrostatic spraying or a spray air gun, attaching the substrate and the cover plate in vacuum, and finally, curing the surface adhesive through heating, thereby completing the packaging of the OLED panel. After vacuum lamination, the nano-micro structure can form short-range ordered cellulose nano-fibers on one side surface of the surface lamination adhesive corresponding to the OLED device, and the fibers can effectively reduce the microcavity effect and the total reflection effect in the OLED panel, so that the light extraction of the panel is improved, and the visual angle of the panel is improved. The method and the structure are simple, the operability is strong, the application range is wide, and the method and the device can be widely used for improving the light extraction of the panel and improving the visual angle of the panel.
Drawings
In order to illustrate the embodiments or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for a person skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic cross-sectional view of an OLED display panel according to the present invention;
FIG. 2 is a block flow diagram of a method for fabricating an OLED display panel according to the present invention; and
fig. 3 to 8 are schematic structural plan views illustrating a method for manufacturing an OLED display panel according to the present invention.
Detailed Description
Reference in the detailed description to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the same phrases in various places in the specification are not necessarily limited to the same embodiment, but are to be construed as independent or alternative embodiments to other embodiments. In light of the disclosure of the embodiments provided by the present invention, it should be understood by those skilled in the art that the embodiments described in the present invention can have other combinations or variations consistent with the concept of the present invention.
Fig. 1 is a schematic cross-sectional view of an OLED display panel 100 according to the present invention. As shown, the present invention provides an OLED display panel 100 including a substrate 110, an OLED device 130, a thin film encapsulation layer 140, and a cover plate 150. A Thin-film transistor (TFT) layer 120 is disposed on the substrate 110, and in the embodiment shown in fig. 1, the Thin-film transistor layer 120 is preferably an indium gallium zinc oxide (IGZO-TFT). The OLED device 130 is disposed on the thin film transistor layer 120, wherein the thin film encapsulation layer 140 is disposed on the OLED device 130 and encapsulates the OLED device 130, thereby improving the stability of the IGZO-TFT. A surface adhesive 160 is disposed on a side of the cover plate 150 facing the substrate, wherein a side of the surface adhesive 160 corresponding to the OLED device 130 is disposed with a nano-microstructure 170, and the substrate 110 and the cover plate 150 are pressed together, so that the microcavity effect and total reflection of the OLED display panel 100 can be effectively reduced, thereby improving the light extraction of the panel and improving the viewing angle of the panel.
It should be noted that, in the Light emitting manner of this embodiment, the OLED Device 130 is preferably a TOP emitting OLED (TE 0LED), that is, the 0LED Device 130 is manufactured after an opaque total reflection anode electrode (not shown) is covered on the substrate 110, and when a voltage is applied to the OLED Device 130, Light is emitted from a TOP transparent or translucent cathode (not shown). In the display panel 100 based on the top-emitting OLED, the thin film transistor layer 120 driving the OLED device 130 is manufactured below the OLED device 130, so that the light emitting surface is separated from the thin film transistor layer 120, and thus the aperture ratio of the OLED display panel 100 is effectively improved.
In the embodiment shown in fig. 1, the projection length of the nano-micro structure 170 on the substrate 110 is longer than the projection length of the OLED device 130 on the substrate 110, and the whole light emitting surface of the OLED device 130 can be scattered, so that the microcavity effect and the total reflection effect in the OLED display panel 100 can be effectively reduced, the light extraction efficiency of the OLED display panel 100 is further improved, and the viewing angle of the OLED display panel 100 is further improved. However, in other alternative embodiments, the projection length of the nano-micro structure 170 on the substrate 110 may be equal to the projection length of the OLED device 130 on the substrate 110, and the above functions may also be performed. The nano-micro structure 170 includes Cellulose Nanofibers (CNF) and the Cellulose nanofibers are prepared using one of silicon-based polymers, epoxy resins, and polyacrylamide-based resins.
Specifically, after the surface adhesive 160 is adhered to the cover plate 150, the nano-microstructures 170, such as cellulose nanofibers, are sprayed on the surface adhesive 160 by electrostatic spraying or spray air gun spraying, and after vacuum lamination, the cellulose nanofibers form short-range (SRO) cellulose nanofibers on the surface adhesive 160, i.e., on a side surface corresponding to the OLED device 130, and the fibers can effectively reduce the microcavity effect and total reflection of the OLED panel, thereby improving light extraction of the panel and improving the viewing angle of the panel. The diameter range of the cellulose nanofibers includes 10 nanometers (nm) to 100 nm, and the entire surface of the thin film encapsulation layer 140 and the OLED device 130 is completely covered by the surface adhesive 160, so as to prevent moisture and oxygen from penetrating into the OLED device 130.
Referring to fig. 2 to 8, the present invention further provides a method for manufacturing an OLED display panel 100, including the following steps: step S10, providing a substrate 110, and fabricating a thin film transistor layer 120(TFT layer) on the substrate 110; step S20, forming an OLED device 130 on the thin-film transistor layer 120; step S30, preparing a Thin-Film Encapsulation layer 140(TFE) on the OLED device 130 and encapsulating the OLED device 130; step S40, providing a cover plate 150, and forming a surface adhesive 160 on a side surface of the cover plate 150 facing the substrate 110; step S50, fabricating a nano-microstructure 170 on a side surface of the surface adhesive 160 corresponding to the OLED device 130; and step S60, pressing the substrate 110 and the cover plate 150.
In step S10, the thin film transistor layer 120 is preferably an indium gallium zinc oxide (IGZO-TFT). In step S30, when the thin film encapsulation layer 140(TFE) is prepared, the water-blocking thin film encapsulation layer 140 is further prepared by plasma-enhanced chemical vapor deposition (RPECVD) or Atomic Layer Deposition (ALD) to encapsulate the OLED device 130.
In step S50, the projection length of the nano-micro structure 170 on the substrate 110 is longer than the projection length of the OLED device 130 on the substrate 110, and the whole light emitting surface of the OLED device 130 can be scattered, so that the microcavity effect and the total reflection effect in the OLED display panel 100 can be effectively reduced, the light extraction efficiency of the OLED display panel 100 is improved, and the viewing angle of the OLED display panel 100 is improved. However, in other alternative embodiments, the projection length of the nano-micro structure 170 on the substrate 110 may be equal to the projection length of the OLED device 130 on the substrate 110, and the above functions may also be performed.
The nano-micro structure 170 includes cellulose nanofibers and the cellulose nanofibers are prepared using one of silicon-based polymers, epoxy resins, and polyacrylamide resins. Cellulose nanofiber is multirow straight line, even and is the distribution of short-range order (SRO) and is in face laminating glue 160 on the side, fibre nanofiber is in through electrostatic spraying or spraying air gun spraying face laminating glue corresponds on a side of OLED device, fibre nanofiber is in through electrostatic spraying or spraying air gun spraying face laminating glue 160 corresponds on a side of OLED device 130, cellulose nanofiber's diameter range includes 10 nanometers to 100 nanometers.
In step S60, in the step of laminating the substrate 110 and the cover plate 150, the substrate 110 and the cover plate 150 are further laminated by vacuum, and the surface adhesive 160 is cured by heating to form the OLED display panel 100.
Specifically, in this embodiment, an IGZO-TFT120 is first fabricated on one side of a substrate 110, then a top-emitting OLED device 130 is fabricated, and then a water-blocking thin film encapsulation layer 140 is fabricated by PECVD or ALD to perform thin film encapsulation on the OLED device 130. A surface-bonding adhesive 160 is attached to one side of the cover plate 150 facing the substrate 110, a nano-microstructure 170 (cellulose nanofiber) is sprayed on the surface-bonding adhesive 160 by electrostatic spraying or a spray air gun, and then the substrate 110 and the cover plate 150 are vacuum-bonded. Finally, the surface mount adhesive 160 is cured by heating, thereby completing the encapsulation of the OLED panel 100. After vacuum lamination, the nano-microstructures 170 can form short-range ordered cellulose nanofibers on a side of the surface adhesive 160 corresponding to the OLED device 130, and the fibers can effectively reduce the microcavity effect and the total reflection effect in the OLED panel 100, thereby improving the light extraction of the panel and improving the viewing angle of the panel. The method and the structure are simple, the operability is strong, the application range is wide, and the method and the device can be widely used for improving the light extraction of the panel and improving the visual angle of the panel.
Furthermore, the present embodiment further provides a light emitting device, which includes the OLED display panel 100 of the foregoing embodiment. For the detailed structure, function and manufacturing method of the OLED display panel 100, please refer to the above embodiments, which are not described herein again.
In view of the foregoing, while the present invention has been described in conjunction with specific embodiments thereof, it is to be understood that many alternatives, modifications, and variations will be apparent to those skilled in the art. Accordingly, it is intended to embrace all such alternatives, modifications, and variations that fall within the scope of the included claims.
Claims (10)
1. An OLED display panel, comprising:
a substrate on which a thin film transistor layer is disposed;
the OLED device is arranged on the thin film transistor layer;
the thin film packaging layer is arranged on the OLED device and packages the OLED; and
and a cover plate, wherein a surface adhesive is arranged on one side surface of the cover plate facing the substrate, a nano-microstructure is arranged on one side surface of the surface adhesive corresponding to the OLED device, and the substrate and the cover plate are pressed.
2. The OLED display panel of claim 1, wherein the nano-microstructures have a projected length on the substrate that is greater than or equal to a projected length of the OLED device on the substrate, the nano-microstructures comprise cellulose nanofibers and the cellulose nanofibers are fabricated using one of silicon-based polymers, epoxies, and polyacrylamide-based resins.
3. The OLED display panel as claimed in claim 2, wherein the cellulose nanofibers are distributed on the side surface of the surface adhesive in a plurality of rows of straight lines, uniformly and in short range, and the diameter of the cellulose nanofibers is in a range from 10 nm to 100 nm.
4. The OLED display panel of claim 1, wherein said face-mount adhesive covers the entire face of said thin film encapsulation layer in an integral manner.
5. A manufacturing method of an OLED display panel comprises the following steps:
providing a substrate, and manufacturing a thin film transistor layer on the substrate;
forming an OLED device on the thin-film transistor layer;
preparing a thin film packaging layer on the OLED device and packaging the OLED device;
providing a cover plate, and manufacturing surface bonding glue on one side surface of the cover plate;
manufacturing a nano microstructure on one side surface of the surface adhesive corresponding to the OLED device; and
and pressing the substrate and the cover plate.
6. The method of claim 5, wherein the nano-microstructures have a projected length on the substrate that is greater than or equal to a projected length of the OLED device on the substrate, the nano-microstructures comprise cellulose nanofibers, and the cellulose nanofibers are prepared using one of silicon-based polymers, epoxy resins, and polyacrylamide resins.
7. The method of claim 6, wherein the cellulose nanofibers are distributed in a plurality of rows in a straight line, uniformly and in a short-range order on the side surface of the surface-mount adhesive, the cellulose nanofibers are sprayed on the side surface of the surface-mount adhesive corresponding to the OLED device by electrostatic spraying or spray air gun, and the diameter of the cellulose nanofibers is in a range from 10 nm to 100 nm.
8. The method of claim 5, wherein in the step of laminating the substrate and the cover plate, the substrate and the cover plate are further laminated by vacuum, and the surface-mount adhesive is cured by heating to form the OLED display panel.
9. The method for fabricating the OLED display panel as claimed in claim 5, wherein the OLED device is further encapsulated by fabricating a water-blocking thin film by plasma enhanced chemical vapor deposition or atomic layer deposition during the fabricating of the thin film encapsulation layer, wherein the thin film transistor layer is an InGaZn thin film transistor.
10. A light emitting device, the OLED display panel of any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111086432.5A CN113871546A (en) | 2021-09-16 | 2021-09-16 | OLED display panel, manufacturing method thereof and light-emitting device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111086432.5A CN113871546A (en) | 2021-09-16 | 2021-09-16 | OLED display panel, manufacturing method thereof and light-emitting device |
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| CN112259693A (en) * | 2020-10-14 | 2021-01-22 | 深圳市华星光电半导体显示技术有限公司 | Display panel and manufacturing method thereof |
| CN113097410A (en) * | 2021-03-19 | 2021-07-09 | 深圳市华星光电半导体显示技术有限公司 | Display panel, manufacturing method thereof and display device |
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2021
- 2021-09-16 CN CN202111086432.5A patent/CN113871546A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101019250A (en) * | 2004-07-23 | 2007-08-15 | 诺瓦莱德公开股份有限公司 | Top-emitting, electroluminescent component having at least one organic layer |
| US20070114925A1 (en) * | 2005-11-18 | 2007-05-24 | Eastman Kodak Company | OLED device having improved light output |
| CN108091774A (en) * | 2017-12-26 | 2018-05-29 | 深圳市华星光电技术有限公司 | The encapsulating structure and preparation method of organic luminescent device |
| CN112259693A (en) * | 2020-10-14 | 2021-01-22 | 深圳市华星光电半导体显示技术有限公司 | Display panel and manufacturing method thereof |
| CN113097410A (en) * | 2021-03-19 | 2021-07-09 | 深圳市华星光电半导体显示技术有限公司 | Display panel, manufacturing method thereof and display device |
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