WO2020082478A1 - Oled 显示面板 - Google Patents

Oled 显示面板 Download PDF

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Publication number
WO2020082478A1
WO2020082478A1 PCT/CN2018/116842 CN2018116842W WO2020082478A1 WO 2020082478 A1 WO2020082478 A1 WO 2020082478A1 CN 2018116842 W CN2018116842 W CN 2018116842W WO 2020082478 A1 WO2020082478 A1 WO 2020082478A1
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Prior art keywords
layer
reflective
sublayer
sub
display panel
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PCT/CN2018/116842
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English (en)
French (fr)
Inventor
杨杰
张明
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武汉华星光电半导体显示技术有限公司
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Application filed by 武汉华星光电半导体显示技术有限公司 filed Critical 武汉华星光电半导体显示技术有限公司
Priority to US16/462,231 priority Critical patent/US20200203666A1/en
Publication of WO2020082478A1 publication Critical patent/WO2020082478A1/zh

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Classifications

    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80Constructional details
    • H10K59/875Arrangements for extracting light from the devices
    • H10K59/878Arrangements for extracting light from the devices comprising reflective means
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00Organic light-emitting devices
    • H10K50/80Constructional details
    • H10K50/85Arrangements for extracting light from the devices
    • H10K50/856Arrangements for extracting light from the devices comprising reflective means
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00Organic light-emitting devices
    • H10K50/80Constructional details
    • H10K50/85Arrangements for extracting light from the devices
    • H10K50/858Arrangements for extracting light from the devices comprising refractive means, e.g. lenses
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80Constructional details
    • H10K59/875Arrangements for extracting light from the devices
    • H10K59/879Arrangements for extracting light from the devices comprising refractive means, e.g. lenses

Definitions

  • the present application relates to a display technology, in particular to an OLED display panel.
  • OLED materials are mostly organic active small molecules, which are sensitive to water and oxygen, and the encapsulation has high requirements for water and oxygen barrier properties; at the same time, OLED materials have other energy than electricity ( Under the action of light, the energy absorption causes the material to decline, which leads to the color deterioration of the screen. Products without UV protection can be found to be bluish-purple when the white light screen is displayed after 80 hours of ultraviolet radiation, and the display effect is distorted. And small and medium-sized panel displays such as mobile phones will inevitably need to be used in sunlight, so it is very important to effectively improve the ultraviolet resistance of the panel.
  • Embodiments of the present application provide an OLED display panel to solve the technical problem that the existing OLED display panel has a weak ability to resist ultraviolet rays, which causes the display effect of the panel to be distorted.
  • An embodiment of the present application provides an OLED display panel, which includes an organic light-emitting layer and a packaging structure provided on the organic light-emitting layer, wherein the packaging structure includes at least one reflective combination layer for reflecting ultraviolet rays;
  • the reflective combination layer includes a first reflective sublayer and a second reflective sublayer disposed on the first reflective sublayer, wherein the materials of the first reflective sublayer and the second reflective sublayer are the same, so The refractive index of the first reflective sub-layer and the second reflective sub-layer are different, so that the reflective combined layer reflects ultraviolet rays;
  • the materials of the first reflective sublayer and the second reflective sublayer are both SiO x N y , the refractive index of the first reflective sublayer is 1.7 ⁇ 2.0, and the refractive index of the second reflective sublayer is 1.3 ⁇ 1.5.
  • the first reflective sub-layer in the reflective combination layer, is located on a side close to the organic light-emitting layer, and the content of oxygen element in the first reflective sub-layer is lower than that of nitrogen The content of elements.
  • the packaging structure includes a buffer layer provided on the reflective combination layer; in the reflective combination layer, the second reflective sublayer is located on a side close to the buffer layer The content of oxygen element in the second reflective sub-layer is greater than that of nitrogen element.
  • the thickness of the first reflective sub-layer is greater than or equal to the thickness of the second reflective sub-layer.
  • the thickness of the first reflective sub-layer and the thickness of the second reflective sub-layer are between 50 nm and 100 nm.
  • At least one reflective combination layer is used as the inorganic layer of the encapsulation structure, and the thickness of the inorganic layer is between 0.5 ⁇ m and 1.5 ⁇ m.
  • the encapsulation structure includes multiple layers of the reflective combination layer, wherein at least part of the reflective combination layer reflects different wavelengths of light.
  • the packaging structure further includes a buffer layer disposed on the reflective combination layer and a barrier layer disposed on the buffer layer;
  • the barrier layer is one of the first reflective sublayer, the second reflective sublayer, or a combined layer of the first reflective sublayer and the second reflective sublayer.
  • An embodiment of the present application provides an OLED display panel, which includes an organic light-emitting layer and a packaging structure provided on the organic light-emitting layer, the packaging structure includes at least one reflective combination layer for reflecting ultraviolet rays,
  • the reflective combination layer includes a first reflective sublayer and a second reflective sublayer disposed on the first reflective sublayer, wherein the materials of the first reflective sublayer and the second reflective sublayer are the same, so The refractive index of the first reflective sub-layer and the second reflective sub-layer are different, so that the reflective combined layer reflects ultraviolet rays.
  • the materials of the first reflective sub-layer and the second reflective sub-layer are both SiO x N y .
  • the first reflective sub-layer in the reflective combination layer, is located on a side close to the organic light-emitting layer, and the content of oxygen element in the first reflective sub-layer is lower than that of nitrogen The content of elements.
  • the packaging structure includes a buffer layer provided on the reflective combination layer; in the reflective combination layer, the second reflective sublayer is located on a side close to the buffer layer The content of oxygen element in the second reflective sub-layer is greater than that of nitrogen element.
  • the refractive index of the first reflective sublayer is 1.7 ⁇ 2.0
  • the refractive index of the second reflective sublayer is 1.3 ⁇ 1.5.
  • the thickness of the first reflective sub-layer is greater than or equal to the thickness of the second reflective sub-layer.
  • the thickness of the first reflective sub-layer and the thickness of the second reflective sub-layer are between 50 nm and 100 nm.
  • At least one reflective combination layer is used as the inorganic layer of the encapsulation structure, and the thickness of the inorganic layer is between 0.5 ⁇ m and 1.5 ⁇ m.
  • the encapsulation structure includes multiple layers of the reflective combination layer, wherein at least part of the reflective combination layer reflects different wavelengths of light.
  • the packaging structure further includes a buffer layer disposed on the reflective combination layer and a barrier layer disposed on the buffer layer;
  • the barrier layer is one of the first reflective sublayer, the second reflective sublayer, or a combined layer of the first reflective sublayer and the second reflective sublayer.
  • the packaging structure further includes a buffer layer disposed on the reflective combination layer and a barrier layer disposed on the buffer layer;
  • the material of the barrier layer is one of SiN x , Al 2 O 3 and TiO 2 .
  • the OLED display panel of the present application uses the same material to prepare the first reflective sub-layer and the second reflective sub-layer with different refractive indexes, and reflects the first reflective sub-layer and the second reflective sub-layer
  • the sub-layer combination forms a reflective combination layer with the function of reflecting ultraviolet light; on the one hand, because the first reflective sub-layer and the second reflective sub-layer are made of the same material, it is easy to prepare with the same equipment, saving the process steps, on the other hand, using
  • the combined structure of the first reflective sub-layer and the second reflective sub-layer with different refraction coefficients improves the reflection effect of the combined reflective layer on ultraviolet rays; it solves the weak ability of the existing OLED display panel to resist ultraviolet rays, resulting in the display effect of the panel Distorted technical issues.
  • FIG. 1 is a schematic structural diagram of an embodiment of an OLED display panel of the present application.
  • FIG. 1 is a schematic structural diagram of an embodiment of an OLED display panel of the present application.
  • the OLED display panel 100 of the embodiment of the present application includes an organic light-emitting layer 10 and a packaging structure 20 disposed on the organic light-emitting layer 10.
  • the packaging structure 20 includes at least one reflective combination layer 21 for reflecting ultraviolet rays, a buffer layer 22 provided on the reflective combination layer 21 and a barrier layer 23 provided on the buffer layer 22.
  • the reflection combination layer 21 includes a first reflection sublayer 211 and a second reflection sublayer 212 disposed on the first reflection sublayer 211.
  • the materials of the first reflective sub-layer 211 and the second reflective sub-layer 212 are the same.
  • the refractive indexes of the first reflective sub-layer 211 and the second reflective sub-layer 212 are different, so that the reflective combination layer 21 reflects ultraviolet rays.
  • the first reflective sublayer 211 and the second reflective sublayer 212 with different refractive indexes are obtained by using the same material, and the first reflective sublayer 211 and the second reflective sublayer 212 are combined to form a reflective ultraviolet light Functional reflection combination layer 21.
  • the first reflective sub-layer 211 and the second reflective sub-layer 212 are made of the same material, it is easy to prepare with the same equipment, and the process steps are saved;
  • the combination structure of the two reflective sub-layers 212 improves the reflection effect of the reflection combination layer 21 on ultraviolet rays, thereby improving the display effect and service life of the OLED display panel.
  • the encapsulation structure 20 includes multiple reflective combination layers 21, wherein at least part of the reflective combination layers 21 reflect different wavelengths of light. Because the wavelength of ultraviolet light is between 10 nanometers and 400 nanometers, the combination structure of different reflective combination layers 21 is used to reflect different ultraviolet wavelengths, which further improves the reflection effect of the OLED display panel on ultraviolet rays, thereby improving the display effect and Service life.
  • the reflective combination layer 21 as a part of the packaging structure saves the process step of additionally preparing an inorganic layer of the packaging structure of the OLED display panel.
  • the materials of the first reflective sub-layer 211 and the second reflective sub-layer 212 are both SiO x N y .
  • SiO x N y has certain water and oxygen barrier properties and adhesion properties, which is suitable for preparing the packaging structure of OLED display panels, and by changing the content ratio of oxygen element and nitrogen element in SiO x N y , the preparation is different
  • the film layers of refractive index are combined to form a functional reflective combined layer that reflects ultraviolet rays.
  • the material of the first reflective sub-layer and the second reflective sub-layer may be a transparent inorganic material with a certain adhesion with water-oxygen barrier properties.
  • the first reflective sub-layer 211 is located on the side close to the organic light-emitting layer 10, and the content of the oxygen element in the first reflective sub-layer 211 is lower than that of the nitrogen element.
  • the second reflective sub-layer 212 is located on the side close to the buffer layer 22, and the content of the oxygen element in the second reflective sub-layer 212 is greater than the content of the nitrogen element.
  • the first reflective combination layer 21 is formed on the organic light-emitting layer 10 and the buffer layer 22 is formed on the last reflective combination layer 21.
  • the first reflective sublayer 211 is formed on the organic light emitting layer 10
  • the second reflective sublayer 212 is formed on the first reflective sublayer 211
  • the buffer layer 22 is formed on the second reflective sublayer of the last reflective combination layer 21 Level 212.
  • the first reflective sub-layer 211 since the content of oxygen element in the first reflective sub-layer 211 is lower than the content of nitrogen element, that is, the content of nitrogen element in the first reflective sub-layer 211 is higher than the content of oxygen element, so the first reflective sub-layer 211 has excellent The water-oxygen barrier property prevents water from entering the organic light-emitting layer 10. Since the content of oxygen element in the second reflective sub-layer 212 is greater than the content of nitrogen element, that is, the content of oxygen element in the second reflective sub-layer 212 is higher than the content of nitrogen element, so the second reflective sub-layer 212 has excellent organic / The inorganic adhesion performance is easy to bond with the buffer layer 22 to improve the stability and sealing performance of the packaging structure 20.
  • the refractive index of the first reflective sub-layer 211 is 1.7 ⁇ 2.0
  • the refractive index of the second reflective sub-layer 212 is 1.3 ⁇ 1.5.
  • the refractive indexes of the first reflective sublayer 211 and the second reflective sublayer 212 are completed under a specific condition, the specific condition is that the first reflective sublayer 211 has excellent water and oxygen barrier properties and the second reflective sublayer
  • the layer 212 has excellent adhesion properties.
  • the function of reflecting ultraviolet rays and the function of encapsulating the light-emitting organic layer 10 of the packaging structure 20 can be satisfied by only one process, saving process steps and reducing costs.
  • the refractive index of the first reflective sub-layer 211 is 1.7, 1.75, 1.8, 1.85, 1.9, 1.95, and 2.0.
  • the refractive index of the second reflective sub-layer 212 is 1.3, 1.35, 1.4, 1.45 and 1.5.
  • the thickness of the first reflective sub-layer 211 is greater than or equal to the thickness of the second reflective sub-layer 212. Since the function of the packaging structure 20 is mainly to prevent external water and oxygen from entering the interior of the OLED display panel 100 to corrode the organic light-emitting layer 10, such an arrangement ensures the water and oxygen barrier performance of the packaging structure 20.
  • the thickness of the first reflective sub-layer 211 and the thickness of the second reflective sub-layer 212 are between 50 nm and 100 nm.
  • ⁇ (Lambda) is the wavelength of incident light (that is, the wavelength of light that can be reflected);
  • n 1 is a high refractive index, that is, the refractive index of the first reflective sublayer 211;
  • n 2 is a low refractive index, that is, the second reflective sublayer
  • d 1 is the film thickness of the first reflective sub-layer;
  • d 2 is the film thickness of the second reflective sub-layer. Therefore, for reflecting ultraviolet rays of any wavelength, it can be achieved by adjusting the refractive index and thickness of the first reflective sub-layer and the second reflective sub-layer.
  • At least one reflective combination layer 21 is used as the inorganic layer of the encapsulation structure 20, and the thickness of the inorganic layer is between 0.5 microns and 1.5 microns. Such an arrangement ensures the flexibility and reliability of the packaging structure 20.
  • the barrier layer 23 is one of the first reflective sublayer 211, the second reflective sublayer 212, or a combined layer of the first reflective sublayer 211 and the second reflective sublayer 212. Such an arrangement may have a protective effect, and further improve the reflection performance of the OLED display panel 100 against ultraviolet rays.
  • the material of the barrier layer may also be one of SiN x , Al 2 O 3 , and TiO 2 .
  • the plasma enhanced chemical vapor deposition method (Plasma Enhanced Chemical Vapor Deposition (PECVD) forms a first reflective sub-layer 211 on the organic light-emitting layer 10, where the first reflective sub-layer 211 is made by adjusting the flow ratio and energy of the film-forming gas;
  • PECVD is also used to form a second reflective sublayer 212 on the first reflective sublayer 211 to form a reflective combined layer 21 in combination with the first reflective sublayer 211, wherein the second reflective sublayer 212 adjusts the flow rate of the film forming gas Proportion and energy are obtained;
  • a first reflective sub-layer 211 is formed on the second reflective sub-layer 212 again, until the thickness of all the reflective combined layers 21 reaches the required level;
  • the buffer layer 22 and the barrier layer 23 are sequentially formed on the second reflective sub-layer 212.
  • the OLED display panel of the present application uses the same material to prepare the first reflective sub-layer and the second reflective sub-layer with different refractive indexes, and reflects the first reflective sub-layer and the second reflective sub-layer
  • the sub-layer combination forms a reflective combination layer with the function of reflecting ultraviolet light; on the one hand, because the first reflective sub-layer and the second reflective sub-layer are made of the same material, it is easy to prepare with the same equipment, saving the process steps, on the other hand, using
  • the combined structure of the first reflective sub-layer and the second reflective sub-layer with different refraction coefficients improves the reflection effect of the combined reflective layer on ultraviolet rays; it solves the weak ability of the existing OLED display panel to resist ultraviolet rays, resulting in the display effect of the panel Distorted technical issues.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

提供一种OLED显示面板,包括封装结构。封装结构(20)包括至少一层用于反射紫外线的反射组合层(21),反射组合层包括第一反射子层(211)和设置在第一反射子层上的第二反射子层(212),其中第一反射子层和第二反射子层的材料相同,第一反射子层和第二反射子层的折射系数不同。

Description

OLED显示面板 技术领域
本申请涉及一种显示技术,特别涉及一种OLED显示面板。
背景技术
在有机发光二极管(Organic Light-Emitting Diode ,OLED)显示面板中, OLED材料多为有机活泼小分子,对水氧敏感,封装的阻隔水氧性能要求高;同时OLED材料在电以外的其他能量(如光)的作用下,吸收能量产生材料的衰退,导致画面颜色衰退,未进行紫外线保护的产品在紫外线照射80小时后进行白光画面显示时能发现其明显偏蓝紫色,显示效果失真。而手机等中小尺寸的面板显示器不可避免的会需要在太阳光下使用,因此有效的提高面板的抗紫外线特性非常重要。
技术问题
本申请实施例提供一种OLED显示面板,以解决现有的OLED显示面板抗紫外线的能力较弱,导致面板的显示效果失真的技术问题。
技术解决方案
本申请实施例提供一种OLED显示面板,包括有机发光层和设置在所述有机发光层上的封装结构,其中,所述封装结构包括至少一层用于反射紫外线的反射组合层;
所述反射组合层包括第一反射子层和设置在所述第一反射子层上的第二反射子层,其中所述第一反射子层和所述第二反射子层的材料相同,所述第一反射子层和所述第二反射子层的折射系数不同,以实现所述反射组合层对紫外线进行反射;
所述第一反射子层和所述第二反射子层的材料均为SiO xN y,所述第一反射子层的折射系数为1.7~2.0,所述第二反射子层的折射系数为1.3~1.5。
在本申请的OLED显示面板中,在所述反射组合层中,所述第一反射子层位于靠近所述有机发光层的一侧,所述第一反射子层的氧元素的含量低于氮元素的含量。
在本申请的OLED显示面板中,所述封装结构包括设置在所述反射组合层上的缓冲层;在所述反射组合层中,所述第二反射子层位于靠近所述缓冲层的一侧,所述第二反射子层的氧元素的含量大于氮元素的含量。
在本申请的OLED显示面板中,所述第一反射子层的厚度大于等于所述第二反射子层的厚度。
在本申请的OLED显示面板中,所述第一反射子层的厚度和第二反射子层的厚度均介于50纳米~100纳米之间。
在本申请的OLED显示面板中,将至少一层所述反射组合层作为封装结构的无机层,所述无机层的厚度介于0.5微米~1.5微米之间。
在本申请的OLED显示面板中,所述封装结构包括多层所述反射组合层,其中至少部分的所述反射组合层反射的光波长不同。
在本申请的OLED显示面板中,所述封装结构还包括设置在所述反射组合层上的缓冲层和设置在所述缓冲层上的阻挡层;
所述阻挡层为所述第一反射子层、所述第二反射子层或者所述第一反射子层和所述第二反射子层的组合层中的一种。
本申请实施例提供一种OLED显示面板,其包括有机发光层和设置在所述有机发光层上的封装结构,所述封装结构包括至少一层用于反射紫外线的反射组合层,
所述反射组合层包括第一反射子层和设置在所述第一反射子层上的第二反射子层,其中所述第一反射子层和所述第二反射子层的材料相同,所述第一反射子层和所述第二反射子层的折射系数不同,以实现所述反射组合层对紫外线进行反射。
在本申请的OLED显示面板中,所述第一反射子层和所述第二反射子层的材料均为SiO xN y
在本申请的OLED显示面板中,在所述反射组合层中,所述第一反射子层位于靠近所述有机发光层的一侧,所述第一反射子层的氧元素的含量低于氮元素的含量。
在本申请的OLED显示面板中,所述封装结构包括设置在所述反射组合层上的缓冲层;在所述反射组合层中,所述第二反射子层位于靠近所述缓冲层的一侧,所述第二反射子层的氧元素的含量大于氮元素的含量。
在本申请的OLED显示面板中,所述第一反射子层的折射系数为1.7~2.0,所述第二反射子层的折射系数为1.3~1.5。
在本申请的OLED显示面板中,所述第一反射子层的厚度大于等于所述第二反射子层的厚度。
在本申请的OLED显示面板中,所述第一反射子层的厚度和第二反射子层的厚度均介于50纳米~100纳米之间。
在本申请的OLED显示面板中,将至少一层所述反射组合层作为封装结构的无机层,所述无机层的厚度介于0.5微米~1.5微米之间。
在本申请的OLED显示面板中,所述封装结构包括多层所述反射组合层,其中至少部分的所述反射组合层反射的光波长不同。
在本申请的OLED显示面板中,所述封装结构还包括设置在所述反射组合层上的缓冲层和设置在所述缓冲层上的阻挡层;
所述阻挡层为所述第一反射子层、所述第二反射子层或者所述第一反射子层和所述第二反射子层的组合层中的一种。
在本申请的OLED显示面板中,所述封装结构还包括设置在所述反射组合层上的缓冲层和设置在所述缓冲层上的阻挡层;
所述阻挡层的材料为SiN x、Al 2O 3、TiO 2中的一种。
有益效果
相较于现有技术的OLED显示面板,本申请的OLED显示面板通过采用相同材料制备得到不同折射系数的第一反射子层和第二反射子层,并将第一反射子层和第二反射子层组合形成具有反射紫外光线功能的反射组合层;一方面由于第一反射子层和第二反射子层采用相同的材料便于采用相同的设备进行制备,节省了工艺步骤,另一方面,采用不同折射系数的第一反射子层和第二反射子层的组合结构,提高了反射组合层对紫外线的反射效果;解决了现有的OLED显示面板抗紫外线的能力较弱,导致面板的显示效果失真的技术问题。
附图说明
为了更清楚地说明本申请实施例或现有技术中的技术方案,下面对实施例中所需要使用的附图作简单的介绍。下面描述中的附图仅为本申请的部分实施例,对于本领域普通技术人员而言,在不付出创造性劳动的前提下,还可以根据这些附图获取其他的附图。
图1为本申请的OLED显示面板的实施例的结构示意图。
本发明的实施方式
请参照附图中的图式,其中相同的组件符号代表相同的组件。以下的说明是基于所例示的本申请具体实施例,其不应被视为限制本申请未在此详述的其它具体实施例。
请参照图1,图1为本申请的OLED显示面板的实施例的结构示意图。本申请的实施例的OLED显示面板100,其包括有机发光层10和设置在有机发光层10上的封装结构20。封装结构20包括至少一层用于反射紫外线的反射组合层21、设置在反射组合层21上的缓冲层22和设置在缓冲层22的阻挡层23。
反射组合层21包括第一反射子层211和设置在第一反射子层211上的第二反射子层212。其中第一反射子层211和第二反射子层212的材料相同。第一反射子层211和第二反射子层212的折射系数不同,以实现反射组合层21对紫外线进行反射。
其中,本实施例通过采用相同材料制备得到不同折射系数的第一反射子层211和第二反射子层212,并将第一反射子层211和第二反射子层212组合形成具有反射紫外光线功能的反射组合层21。
一方面由于第一反射子层211和第二反射子层212采用相同的材料便于采用相同的设备进行制备,节省了工艺步骤;另一方面,采用不同折射系数的第一反射子层211和第二反射子层212的组合结构,提高了反射组合层21对紫外线的反射效果,从而提高了OLED显示面板的显示效果和使用寿命。
在本实施例中,封装结构20包括多层反射组合层21,其中至少部分的反射组合层21反射的光波长不同。由于紫外线的光波长介于10纳米~400纳米之间,因此采用不同反射组合层21的组合结构对不同紫外线波长进行反射,进一步提高了OLED显示面板对紫外线的反射效果,从而提高了显示效果和使用寿命。
另外,将反射组合层21作为封装结构的一部分,节省了另外制备OLED显示面板的封装结构的无机层的工艺步骤。
在本实施例中,第一反射子层211和第二反射子层212的材料均为SiO xN y。需要说明的是,x和y为系数值,比如x=1,y=2,等等。其中,SiO xN y具有一定的水氧阻隔性能和粘附性能,适合用于制备OLED显示面板的封装结构,且通过改变SiO xN y中氧元素和氮元素的含量配比,又制备不同折射系数的膜层,进而组合形成反射紫外线的功能反射组合层。
当然在本实施例中,作为第一反射子层和第二反射子层的材料为具有水氧阻隔性能的具有一定粘附性的透明的无机材料即可。
具体的,在反射组合层21中,第一反射子层211位于靠近有机发光层10的一侧,第一反射子层211的氧元素的含量低于氮元素的含量。
在反射组合层21中,第二反射子层212位于靠近缓冲层22的一侧,第二反射子层212的氧元素的含量大于氮元素的含量。
当反射组合层21具有多层时,第一层反射组合层21形成在有机发光层10上,缓冲层22形成在最末层反射组合层21上。具体的,第一反射子层211形成在有机发光层10上,第二反射子层212形成在第一反射子层211上,缓冲层22形成在最末层反射组合层21的第二反射子层212上。
其中,由于第一反射子层211中的氧元素的含量低于氮元素的含量,即第一反射子层211的氮元素含量相对于氧元素含量较高,因此第一反射子层211具有优良的水氧阻隔性能,以防止水氧进入有机发光层10。由于第二反射子层212中的氧元素的含量大于氮元素的含量,即第二反射子层212的氧元素含量相对于氮元素含量较高,因此第二反射子层212具有优良的有机/无机的粘附性能,易于和缓冲层22粘结,以提高封装结构20的稳定性和密封性能。
在本实施例中,第一反射子层211的折射系数为1.7~2.0,第二反射子层212的折射系数为1.3~1.5。其中,第一反射子层211和第二反射子层212的折射系数均在一特定条件下完成的,该特定条件为满足第一反射子层211具有优良的水氧阻隔性能以及第二反射子层212具有优良的粘附性能。这样的设置,仅通过一项工艺便可即满足了反射紫外线的功能又满足了封装结构20封装发光有机层10的功能,节省了工艺步骤,降低了成本。可选的,第一反射子层211的折射系数为1.7、1.75、1.8、1.85、1.9、1.95和2.0。第二反射子层212的折射系数为1.3、1.35、1.4、1.45和1.5。
在本实施例中,第一反射子层211的厚度大于等于第二反射子层212的厚度。由于封装结构20的功能主要在于防止外界的水氧进入OLED显示面板100的内部腐蚀有机发光层10,因此这样的设置,确保了封装结构20的水氧阻隔性能。
另外,第一反射子层211的厚度和第二反射子层212的厚度均介于50纳米~100纳米之间。
需要说明的是,第一反射子层211和第二反射子层212满足关系λ=2*(n 1d 1+n 2d 2)时,对相应的波长具有反射作用。其中,λ(Lambda)为入射光波长(即可反射的光波长);n 1为高折射系数, 即第一反射子层211的折射系数;n 2为低折射系数,即第二反射子层212的折射系数;d 1为第一反射子层的膜厚;d 2为第二反射子层的膜厚。因此对于反射任一波长的紫外线,可以通过调节第一反射子层、第二反射子层的折射系数和厚度实现。
在本实施例中,将至少一层反射组合层21作为封装结构20的无机层,该无机层的厚度介于0.5微米~1.5微米之间。这样的设置,以确保封装结构20的柔性可靠性。
在本实施例中,阻挡层23为第一反射子层211、第二反射子层212或者第一反射子层211和第二反射子层212的组合层中的一种。这样的设置,即可以具有保护的作用,又进一步提高了OLED显示面板100对紫外线的反射性能。当然阻挡层的材料也可以为SiN x、Al 2O 3、TiO 2中的一种。
本实施例的OLED显示面板的制作过程是:
首先,提供一基板,并在基板上依次形成薄膜晶体管阵列层和有机发光层10;
然后,采用等离子体增强化学的气相沉积法(Plasma Enhanced Chemical Vapor Deposition ,PECVD)在有机发光层10上形成第一反射子层211,其中第一反射子层211通过调节成膜气体的流量配比和能量制得;
接着,同样采用PECVD在第一反射子层211上形成第二反射子层212,以和第一反射子层211组合形成反射组合层21,其中第二反射子层212通过调节成膜气体的流量配比和能量制得;
其次,又在第二反射子层212上形成第一反射子层211,如是循环,直至所有的反射组合层21的厚度达到要求为止;
最后,依次在第二反射子层212上形成缓冲层22和阻挡层23。
这样便完成了本实施例的制作过程。
相较于现有技术的OLED显示面板,本申请的OLED显示面板通过采用相同材料制备得到不同折射系数的第一反射子层和第二反射子层,并将第一反射子层和第二反射子层组合形成具有反射紫外光线功能的反射组合层;一方面由于第一反射子层和第二反射子层采用相同的材料便于采用相同的设备进行制备,节省了工艺步骤,另一方面,采用不同折射系数的第一反射子层和第二反射子层的组合结构,提高了反射组合层对紫外线的反射效果;解决了现有的OLED显示面板抗紫外线的能力较弱,导致面板的显示效果失真的技术问题。
以上所述,对于本领域的普通技术人员来说,可以根据本发明的技术方案和技术构思作出其他各种相应的改变和变形,而所有这些改变和变形都应属于本发明后附的权利要求的保护范围。

Claims (18)

  1. 一种OLED显示面板,包括有机发光层和设置在所述有机发光层上的封装结构,其中,所述封装结构包括至少一层用于反射紫外线的反射组合层;
    所述反射组合层包括第一反射子层和设置在所述第一反射子层上的第二反射子层,其中所述第一反射子层和所述第二反射子层的材料相同,所述第一反射子层和所述第二反射子层的折射系数不同,以实现所述反射组合层对紫外线进行反射;
    所述第一反射子层和所述第二反射子层的材料均为SiO xN y,所述第一反射子层的折射系数为1.7~2.0,所述第二反射子层的折射系数为1.3~1.5。
  2. 根据权利要求1所述的OLED显示面板,其中,在所述反射组合层中,所述第一反射子层位于靠近所述有机发光层的一侧,所述第一反射子层的氧元素的含量低于氮元素的含量。
  3. 根据权利要求1所述的OLED显示面板,其中,所述封装结构包括设置在所述反射组合层上的缓冲层;在所述反射组合层中,所述第二反射子层位于靠近所述缓冲层的一侧,所述第二反射子层的氧元素的含量大于氮元素的含量。
  4. 根据权利要求1所述的OLED显示面板,其中,所述第一反射子层的厚度大于等于所述第二反射子层的厚度。
  5. 根据权利要求1所述的OLED显示面板,其中,所述第一反射子层的厚度和第二反射子层的厚度均介于50纳米~100纳米之间。
  6. 根据权利要求1所述的OLED显示面板,其中,将至少一层所述反射组合层作为封装结构的无机层,所述无机层的厚度介于0.5微米~1.5微米之间。
  7. 根据权利要求1所述的OLED显示面板,其中,所述封装结构包括多层所述反射组合层,其中至少部分的所述反射组合层反射的光波长不同。
  8. 根据权利要求1所述的OLED显示面板,其中,所述封装结构还包括设置在所述反射组合层上的缓冲层和设置在所述缓冲层上的阻挡层;
    所述阻挡层为所述第一反射子层、所述第二反射子层或者所述第一反射子层和所述第二反射子层的组合层中的一种。
  9. 一种OLED显示面板,包括有机发光层和设置在所述有机发光层上的封装结构,其中,所述封装结构包括至少一层用于反射紫外线的反射组合层;
    所述反射组合层包括第一反射子层和设置在所述第一反射子层上的第二反射子层,其中所述第一反射子层和所述第二反射子层的材料相同,所述第一反射子层和所述第二反射子层的折射系数不同,以实现所述反射组合层对紫外线进行反射。
  10. 根据权利要求9所述的OLED显示面板,其中,所述第一反射子层和所述第二反射子层的材料均为SiO xN y
  11. 根据权利要求10所述的OLED显示面板,其中,在所述反射组合层中,所述第一反射子层位于靠近所述有机发光层的一侧,所述第一反射子层的氧元素的含量低于氮元素的含量。
  12. 根据权利要求10所述的OLED显示面板,其中,所述封装结构包括设置在所述反射组合层上的缓冲层;在所述反射组合层中,所述第二反射子层位于靠近所述缓冲层的一侧,所述第二反射子层的氧元素的含量大于氮元素的含量。
  13. 根据权利要求9所述的OLED显示面板,其中,所述第一反射子层的折射系数为1.7~2.0,所述第二反射子层的折射系数为1.3~1.5。
  14. 根据权利要求9所述的OLED显示面板,其中,所述第一反射子层的厚度大于等于所述第二反射子层的厚度。
  15. 根据权利要求9所述的OLED显示面板,其中,所述第一反射子层的厚度和第二反射子层的厚度均介于50纳米~100纳米之间。
  16. 根据权利要求9所述的OLED显示面板,其中,将至少一层所述反射组合层作为封装结构的无机层,所述无机层的厚度介于0.5微米~1.5微米之间。
  17. 根据权利要求9所述的OLED显示面板,其中,所述封装结构包括多层所述反射组合层,其中至少部分的所述反射组合层反射的光波长不同。
  18. 根据权利要求9所述的OLED显示面板,其中,所述封装结构还包括设置在所述反射组合层上的缓冲层和设置在所述缓冲层上的阻挡层;
    所述阻挡层为所述第一反射子层、所述第二反射子层或者所述第一反射子层和所述第二反射子层的组合层中的一种。
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