CN113178528B - Display panel and display device - Google Patents
Display panel and display device Download PDFInfo
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- CN113178528B CN113178528B CN202110371082.0A CN202110371082A CN113178528B CN 113178528 B CN113178528 B CN 113178528B CN 202110371082 A CN202110371082 A CN 202110371082A CN 113178528 B CN113178528 B CN 113178528B
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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
- H10K50/85—Arrangements for extracting light from the devices
- H10K50/854—Arrangements for extracting light from the devices comprising scattering means
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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
- H10K50/85—Arrangements for extracting light from the devices
- H10K50/858—Arrangements for extracting light from the devices comprising refractive means, e.g. lenses
Abstract
The application discloses a display panel and a display device, which comprise an OLED functional layer; the scattering layer is arranged on the OLED functional layer; and the packaging structure is arranged on the scattering layer. This application through OLED functional layer with set up between the packaging structure the scattering layer is solved OLED functional layer with the unmatched problem of refracting index between the packaging structure has improved the light-emitting efficiency of OLED device.
Description
Technical Field
The application relates to the field of display, in particular to a display panel and a display device.
Background
An Organic Light Emitting Diode (OLED) has the advantages of ultra-thin and Light-Emitting, self-Light-Emitting, wide viewing angle, fast response, low power consumption, and flexible display.
From the first generation of organic fluorescent small-molecule OLEDs to the present, the efficiency and the service life of the OLED are remarkably improved, the theoretical internal quantum efficiency of the first generation of fluorescent OLED can reach 25%, and the theoretical internal quantum efficiency of the subsequent phosphorescence and TADF luminescent material can reach 100%. However, because the refractive indexes of the metal layer and the organic layer of the OLED device are not matched and the refractive indexes of the organic layer and the air are not matched, most of the photons generated by the OLED are localized inside the OLED device and cannot escape into the air. The light extraction efficiency of the OLED device of the standard planar structure is reported to be only about 20%, so the light extraction efficiency is one of the main problems limiting the rapid development of the OLED.
Disclosure of Invention
The invention aims to provide a display panel and a display device, and aims to solve the technical problem of low light emitting efficiency caused by mismatching of refractive indexes of a metal layer, an organic layer and air of an OLED device in the display panel.
To achieve the above object, the present invention provides a display panel including: an OLED functional layer; the scattering layer is arranged on the OLED functional layer; and the packaging structure is arranged on the scattering layer.
Further, the scattering layer is a nano film layer; the thickness of the scattering layer is 8-12 nm.
Further, the package structure includes: a first inorganic layer disposed on the scattering layer; the first photonic crystal layer is arranged on the first inorganic layer and is provided with a plurality of first photonic crystals arranged at intervals; the first organic layer is arranged on the first inorganic layer, covers the first photonic crystals and fills gaps between every two adjacent first photonic crystals; a second inorganic layer disposed on the first organic layer; the second photonic crystal layer is arranged on the second inorganic layer and is provided with a plurality of second photonic crystals arranged at intervals; and the second organic layer is arranged on the second inorganic layer, covers the second photonic crystals and fills gaps between two adjacent second photonic crystals.
Further, the projection of the first photonic crystal on the scattering layer and the projection of the second photonic crystal on the scattering layer are spaced and arranged in a staggered mode.
Further, the refractive index of the second photonic crystal layer is smaller than that of the first photonic crystal layer; the refractive index of the first organic layer is less than the refractive index of the first photonic crystal layer; the refractive index of the second organic layer is less than the refractive index of the second photonic crystal layer.
Further, the materials used by the first photonic crystal layer and the second photonic crystal layer are silicon nitride and zirconium oxide.
Further, the display panel further includes: a third inorganic layer disposed on the second organic layer.
Further, a material used for the first inorganic layer, the second inorganic layer, and the third inorganic layer is any one of silicon nitride, silicon oxide, aluminum oxide, and silicon carbide; and/or
The material used for the first organic layer and the second organic layer is any one of acrylic resin, epoxy resin and cellulose organic ester.
Further, the OLED functional layer includes: a substrate; the first electrode layer is arranged on the substrate; the light-emitting functional layer is arranged on the first electrode layer; and a second electrode layer provided on the light-emitting functional layer.
In order to achieve the above object, the present invention further provides a display device including the display panel described above.
The technical effect of the invention is to provide a display panel and a display device, and the problem of unmatched refractive index between the OLED functional layer and the packaging structure is solved by arranging the scattering layer between the OLED functional layer and the packaging structure, so that the light emitting efficiency of an OLED device is improved.
Further, by disposing the first photonic crystal layer between the first inorganic layer and the first organic layer, the problem of mismatch in refractive index between the first organic layer and the second organic layer is solved; through the second inorganic layer with set up between the second organic layer the second photonic crystal layer solves the unmatched problem of refracting index between second organic layer and the air to further improved the light-emitting efficiency of OLED functional layer has further promoted display panel's display quality.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a display panel provided in embodiment 1 of the present application;
fig. 2 is a schematic structural diagram of a display panel provided in embodiment 2 of the present application;
fig. 3 is a plan view of a photonic crystal layer provided in example 2 of the present application.
Description of reference numerals:
100a, 100b display panels; 10OLED functional layers;
20 a scattering layer; 30a, 30 b;
101 a substrate; 102 a first electrode layer;
103 a light emitting functional layer; 104 a second electrode layer;
301 a first inorganic layer; 302a first photonic crystal layer;
303 a first organic layer; 304 a second inorganic layer;
305a second photonic crystal layer; 306 a second organic layer;
307 a third inorganic layer.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. Furthermore, it should be understood that the detailed description and specific examples, while indicating exemplary embodiments of the invention, are given by way of illustration and explanation only, and are not intended to limit the scope of the invention. In the present application, unless indicated to the contrary, the use of the directional terms "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, and more particularly to the orientation of the figures of the drawings; while "inner" and "outer" are with respect to the outline of the device.
Example 1
As shown in fig. 1, fig. 1 is a schematic structural diagram of a display panel provided in embodiment 1 of the present application.
The present embodiment provides a display panel 100a, which includes an OLED functional layer 10, a scattering layer 20, and an encapsulation structure 30 a.
The OLED functional layer 10 includes a substrate 101, a first electrode layer 102, a light emitting functional layer 103, and a second electrode layer 104.
The substrate 101 is an array substrate. The array substrate comprises a flexible substrate, a buffer layer and a thin film transistor layer, wherein the buffer layer is arranged on the flexible substrate, and the thin film transistor layer is arranged on the buffer layer. The thin film transistor layer comprises an active layer, a grid electrode insulating layer, a grid electrode layer, a passivation layer, a source drain electrode layer and a flat layer. Specifically, the gate layer is arranged on the substrate; the grid insulating layer is arranged on the grid layer and the substrate and wraps the grid layer; the active layer is arranged on the gate insulating layer and is opposite to the gate electrode layer; the passivation layer is arranged on the active layer and the grid electrode insulating layer and wraps the grid electrode insulating layer; the source drain electrode layer penetrates through the passivation layer and the grid electrode insulating layer and is connected to the upper surface of the active layer; the flat layer is arranged on the source drain layer and the passivation layer and used for protecting each thin film transistor in the thin film transistor layer and preventing the thin film transistor from being corroded by water and oxygen.
The first electrode layer 102 is disposed on the substrate 101, and is an anode of the OLED functional layer 10. The material used for the first electrode layer 102 includes, but is not limited to, Indium Tin Oxide (ITO).
The light emitting function layer 103 is provided on the first electrode layer 102.
The second electrode layer 104 is disposed on the light emitting function layer 103, and the material of the second electrode layer 104 is a metal material. The second electrode layer 104 is a cathode of the light-emitting functional layer 103, and forms a pair of electrodes with the first electrode layer 102 to drive the light-emitting functional layer 103 to emit light.
The scattering layer 20 is provided on the OLED functional layer 10. The scattering layer 20 is a nano-film layer, and the thickness of the scattering layer is 8-12 nm. Specifically, in an actual process, after the evaporation of the second electrode layer 104 is completed, the evaporation is controlled by a mask plate on the upper surface of the second electrode layer 104 to form the patterned scattering layer 20, the thickness of the scattering layer 20 is adjustable, the pattern is not unique, preferably 9nm or 10nm, the total internal reflection of the interface between the second electrode layer 104 and the packaging structure 30a is improved by the thickness of the scattering layer 20, and the light extraction efficiency of the OLED functional layer 10 is improved.
The encapsulation structure 30a includes at least one inorganic layer and one organic layer stacked together to protect the OLED functional layer 10 and prevent external water and oxygen from invading into the OLED device, which affects the yield of the OLED device.
The embodiment provides a display panel 100a, the scattering layer 20 is disposed between the second electrode layer 104 and the package structure 30a, the thickness of the scattering layer 20 is adjusted to improve the interfacial total internal reflection between the second electrode layer 104 and the package structure 30a, the problem that the refractive index of the second electrode layer 104 is not matched with the refractive index of the organic layer of the package structure 30a is solved, the light extraction efficiency of the OLED functional layer 10 is improved, and the display quality of the display panel 100a is improved.
The present embodiment further provides a display device, which includes the display panel 100a described above. The display device may be: any product or component with a display function, such as electronic paper, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.
Example 2
As shown in fig. 2, fig. 2 is a schematic structural diagram of a display panel provided in embodiment 2 of the present application.
The present embodiment provides a display panel and a display device, which include most of the technical features of embodiment 1, and the difference is that the package structure 30b of the present embodiment is different from the package structure 30a of embodiment 1.
The present embodiment provides a display panel 100b, and the display panel 100b includes a package structure 30 b.
Specifically, the package structure 30b includes a first inorganic layer 301, a first photonic crystal layer 302, a first organic layer 303, a second inorganic layer 304, a second photonic crystal layer 305, a second organic layer 306, and a third inorganic layer 307.
The first inorganic layer 301 is disposed on the scattering layer 20. The material used for the first inorganic layer 301 is any one of silicon nitride, silicon oxide, aluminum oxide, and silicon carbide.
The first photonic crystal layer 302 is provided on the first inorganic layer 301, and has a plurality of first photonic crystals 302a arranged at intervals. The material used for the first photonic crystal layer 302 is silicon nitride or zirconium oxide. The first photonic crystal layer 302 may be prepared by Plasma Enhanced Chemical Vapor Deposition (PECVD), Atomic Layer Deposition (ALD), or the like using a mask plate.
The first organic layer 303 is disposed on the first inorganic layer 301, covers the first photonic crystals 302a, and fills a gap between two adjacent first photonic crystals 302 a. The material used for the first organic layer 303 is any one of acrylic resin, epoxy resin, and cellulose organic ester.
The second inorganic layer 304 is disposed on the first organic layer 303. The material used for the second inorganic layer 304 is any one of silicon nitride, silicon oxide, aluminum oxide, and silicon carbide.
The second photonic crystal layer 305 is provided on the second inorganic layer 304, and has a plurality of second photonic crystals 305a arranged at intervals. The material of the second photonic crystal layer 305 is silicon nitride or zirconium oxide. The second photonic crystal layer 305 may be prepared by Plasma Enhanced Chemical Vapor Deposition (PECVD), Atomic Layer Deposition (ALD), or the like using a mask.
The second organic layer 306 is disposed on the second inorganic layer 304, covers the second photonic crystals 305a and fills the gap between two adjacent second photonic crystals 305 a. The material used for the second organic layer 306 is any one of acrylic resin, epoxy resin and cellulose organic ester.
The third inorganic layer 307 is disposed on the second organic layer 306. The material used for the third inorganic layer 307 is any one of silicon nitride, silicon oxide, aluminum oxide, and silicon carbide. In this embodiment, the thickness of the first inorganic layer 301 is the same as the thickness of the second inorganic layer 304, and both the thickness of the first inorganic layer 301 and the thickness of the second inorganic layer 304 are smaller than the thickness of the third inorganic layer 307. The third inorganic layer 307 is disposed on the outermost side of the encapsulation structure 30b, and when the thickness of the third inorganic layer is greater than the thickness of the first inorganic layer 301 or the thickness of the second inorganic layer 304, the outermost side of the encapsulation structure 30b is beneficial to improving the water and oxygen isolation performance, so as to improve the encapsulation performance of the OLED functional layer 10.
In this embodiment, the refractive index of the first organic layer 303 is smaller than the refractive index of the first photonic crystal layer 302. The first photonic crystal layer 302 is used to solve the problem that the refractive index of the first organic layer 303 is not matched with the refractive index of the second organic layer 306, so as to improve the light extraction efficiency of the OLED functional layer 10.
The refractive index of the second organic layer 306 is smaller than the refractive index of the second photonic crystal layer 305. The second photonic crystal layer 305 is used to solve the problem that the refractive index of the second organic layer 306 is not matched with the refractive index of the outside air, so as to improve the light extraction efficiency of the OLED functional layer 10.
Referring to fig. 3, fig. 3 is a plan view of a photonic crystal layer provided in example 2 of the present application.
The projection of the first photonic crystal 302a on the scattering layer 20 and the projection of the second photonic crystal 305a on the scattering layer 20 are spaced apart and offset from each other. Specifically, the projection of the first photonic crystal 302a and the projection of the second photonic crystal 305a are arranged in an array on the scattering layer 20 and are offset from each other. In other words, the projection of the first photonic crystal 302a is disposed between the projections of two adjacent second photonic crystals 305a and is offset from each other; the projections of the second photonic crystals 305a are disposed between the projections of the two adjacent first photonic crystals 302a and are disposed in a staggered manner, which is beneficial to further improving the problems of the refractive index between the first organic layer 303 and the second organic layer 306 and the refractive index mismatch between the second organic layer 306 and the air, so as to improve the light extraction efficiency of the OLED functional layer 10.
It should be emphasized that, in this embodiment, the photon loss problem inside the OLED device can be improved by adjusting the projection density of the first photonic crystal 302a and the second photonic crystal 305a on the scattering layer 20, so as to improve the light extraction efficiency of the OLED functional layer 10; the photon loss problem in the OLED device can also be improved by adjusting the density, depth, period and duty ratio of the first photonic crystal layer 302 or the second photonic crystal layer 305, so as to improve the light extraction efficiency of the OLED functional layer 10.
The present embodiment provides a display panel 100b, in which the scattering layer 20 is disposed between the second electrode layer 104 and the package structure 30b, so as to solve the problem of the mismatch of the refractive indexes between the second electrode layer 104 and the package structure 30 a; by disposing the first photonic crystal layer 302 between the first inorganic layer 301 and the first organic layer 303, the problem of refractive index mismatch between the first organic layer 303 and the second organic layer 306 is solved; by arranging the second photonic crystal layer 305 between the second inorganic layer 304 and the second organic layer 306, the problem of unmatched refractive index between the second organic layer 306 and the air is solved, so that the light extraction efficiency of the OLED functional layer 10 is effectively improved, and the display quality of the display panel 100b is improved. In other words, the present application solves the problem of light loss caused by mismatch of refractive indexes between a metal layer and an organic layer, between an organic layer and an organic layer, and between an organic layer and air at the light emitting side of the light emitting functional layer 103, so as to improve the light emitting efficiency of the OLED device.
Preferably, the refractive index of the second organic layer 306 is smaller than the refractive index of the second photonic crystal layer 305, the refractive index of the first organic layer 303, and the refractive index of the first photonic crystal layer 302 in sequence, so that the problem of light loss caused by mismatch of refractive indexes between a metal layer and an organic layer, between an organic layer and an organic layer, and between an organic layer and air can be further solved, and the light extraction efficiency of the OLED device is improved.
The display panel and the display device have the advantages that the scattering layer is arranged between the second electrode layer and the packaging structure, so that the problem of unmatched refractive indexes between the second electrode layer and the packaging structure is solved, and the light emitting efficiency of an OLED device is improved.
Further, by disposing the first photonic crystal layer between the first inorganic layer and the first organic layer, the problem of mismatch in refractive index between the first organic layer and the second organic layer is solved; through the second inorganic layer with set up between the second organic layer the second photonic crystal layer solves the unmatched problem of refracting index between second organic layer and the air to further improved the light-emitting efficiency of OLED functional layer has further promoted display panel's display quality.
The present embodiment further provides a display device, which includes the display panel 100b described above. The display device may be: any product or component with a display function, such as electronic paper, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.
The foregoing detailed description is directed to a display panel and a display device provided in the embodiments of the present application, and specific examples are applied herein to explain the principles and implementations of the present application, and the above description of the embodiments is only used to help understanding the method and the core idea of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (8)
1. A display panel, comprising:
an OLED functional layer;
the scattering layer is arranged on the OLED functional layer; and
the packaging structure is arranged on the scattering layer;
wherein, the packaging structure includes:
a first inorganic layer disposed on the scattering layer;
the first photonic crystal layer is arranged on the first inorganic layer and is provided with a plurality of first photonic crystals arranged at intervals;
the first organic layer is arranged on the first inorganic layer, covers the first photonic crystals and fills a gap between every two adjacent first photonic crystals;
a second inorganic layer disposed on the first organic layer;
the second photonic crystal layer is arranged on the second inorganic layer and is provided with a plurality of second photonic crystals arranged at intervals; and
the second organic layer is arranged on the second inorganic layer, covers the second photonic crystals and fills gaps between every two adjacent second photonic crystals;
wherein the refractive index of the second photonic crystal layer is smaller than the refractive index of the first photonic crystal layer; the refractive index of the first organic layer is less than the refractive index of the first photonic crystal layer; the refractive index of the second organic layer is less than the refractive index of the second photonic crystal layer.
2. The display panel according to claim 1,
the scattering layer is a nano film layer;
the thickness of the scattering layer is 8-12 nm.
3. The display panel according to claim 1,
the projection of the first photonic crystal on the scattering layer and the projection of the second photonic crystal on the scattering layer are mutually spaced and arranged in a staggered mode.
4. The display panel according to claim 1,
the first photonic crystal layer and the second photonic crystal layer are made of silicon nitride and zirconium oxide.
5. The display panel according to claim 3, further comprising:
a third inorganic layer disposed on the second organic layer.
6. The display panel according to claim 5,
the material used for the first inorganic layer, the second inorganic layer, and the third inorganic layer is any one of silicon nitride, silicon oxide, aluminum oxide, and silicon carbide; and/or
The material used for the first organic layer and the second organic layer is any one of acrylic resin, epoxy resin and cellulose organic ester.
7. The display panel of claim 1, wherein the OLED functional layer comprises:
a substrate;
the first electrode layer is arranged on the substrate;
the light-emitting functional layer is arranged on the first electrode layer; and
and the second electrode layer is arranged on the light-emitting functional layer.
8. A display device characterized by comprising the display panel according to any one of claims 1 to 7.
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| CN202110371082.0A CN113178528B (en) | 2021-04-07 | 2021-04-07 | Display panel and display device |
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| CN202110371082.0A CN113178528B (en) | 2021-04-07 | 2021-04-07 | Display panel and display device |
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| CN113178528B true CN113178528B (en) | 2022-05-31 |
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| CN115368776A (en) * | 2021-09-30 | 2022-11-22 | 广东聚华印刷显示技术有限公司 | Ink, optical refractive index adjusting film, preparation method and application thereof |
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| CN110596945A (en) * | 2019-09-20 | 2019-12-20 | 厦门天马微电子有限公司 | Display panel and display device |
| CN110993822A (en) * | 2019-12-18 | 2020-04-10 | 京东方科技集团股份有限公司 | Display panel, manufacturing method thereof and display device |
| CN111477763A (en) * | 2020-04-28 | 2020-07-31 | Tcl华星光电技术有限公司 | Display panel, preparation method thereof and display device |
| CN112186124A (en) * | 2020-10-12 | 2021-01-05 | 京东方科技集团股份有限公司 | Organic light emitting diode and display panel |
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| KR102477262B1 (en) * | 2016-08-05 | 2022-12-14 | 삼성디스플레이 주식회사 | Organic electroluminescence display device |
| CN108336241A (en) * | 2018-01-19 | 2018-07-27 | 云谷（固安）科技有限公司 | OLED encapsulates film layer and preparation method thereof, OLED screen and lighting device |
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| CN110596945A (en) * | 2019-09-20 | 2019-12-20 | 厦门天马微电子有限公司 | Display panel and display device |
| CN110993822A (en) * | 2019-12-18 | 2020-04-10 | 京东方科技集团股份有限公司 | Display panel, manufacturing method thereof and display device |
| CN111477763A (en) * | 2020-04-28 | 2020-07-31 | Tcl华星光电技术有限公司 | Display panel, preparation method thereof and display device |
| CN112186124A (en) * | 2020-10-12 | 2021-01-05 | 京东方科技集团股份有限公司 | Organic light emitting diode and display panel |
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