WO2017075880A1 - Oled显示器及其显示模组 - Google Patents

Oled显示器及其显示模组 Download PDF

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WO2017075880A1
WO2017075880A1 PCT/CN2015/098973 CN2015098973W WO2017075880A1 WO 2017075880 A1 WO2017075880 A1 WO 2017075880A1 CN 2015098973 W CN2015098973 W CN 2015098973W WO 2017075880 A1 WO2017075880 A1 WO 2017075880A1
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layer
oled display
refractive index
cathode plate
display module
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French (fr)
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陈黎暄
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/875—Arrangements for extracting light from the devices
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    • H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/30—Coordination compounds
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    • H10K85/324—Metal complexes comprising a group IIIA element, e.g. Tris (8-hydroxyquinoline) gallium [Gaq3] comprising aluminium, e.g. Alq3
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    • H10K85/636—Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine comprising heteroaromatic hydrocarbons as substituents on the nitrogen atom
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    • H10K85/6572—Polycyclic condensed heteroaromatic hydrocarbons comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole

Definitions

  • the present invention relates to the technical field of OLED display, and in particular to an OLED display and a display module thereof.
  • An organic light emitting diode (OLED) device generally consists of a cathode, an anode, and a light emitting layer.
  • the cathode is generally made of a metal material such as Al
  • the anode is generally made of a material such as ITO. Electrons and holes are injected from the cathode and the anode, respectively, and excitons are formed in the organic light-emitting layer to excite the light-emitting layer material to emit light.
  • most of the products in the laboratory are mainly transparent anode ITO.
  • the structure of the device exhibits a top emission state, and the production line is often placed at the bottom due to the destruction of organic materials by ITO evaporation, thereby adopting the bottom.
  • the structure of Bottom emission that is, light is emitted from the cathode.
  • the cathode becomes a reflective layer, causing ambient light or internal stray light to reflect after being incident on the cathode.
  • the cathode is mostly metal, and the reflectance is high, thereby reducing the contrast and sharpness of the OLED.
  • the current practice in the industry is to add a quarter-wave plate + polarizer structure above the OLED light-emitting surface to improve this reflection, but the cost is higher.
  • Embodiments of the present invention provide an OLED display and a display module thereof to solve the technical problem of lowering contrast and sharpness of an OLED display due to high cathode reflectivity in the prior art.
  • an embodiment of the present invention provides an OLED display module, where the OLED display module includes: a cathode plate, an anode plate, and a light emitting function layer disposed between the cathode plate and the anode plate.
  • the refractive index between the layers of the luminescent functional layer satisfies the relationship that the refractive index of the luminescent functional layer material adjacent to the cathode plate is much larger than the refraction of the luminescent functional layer material adjacent to the cathode plate adjacent thereto. rate.
  • the light emitting function layer is along the cathode plate to the anode plate side
  • the orientation includes, in order, an electron injection layer, an electron transport layer, a light-emitting layer, a hole transport layer, and a hole injection layer.
  • one or more layers of refractive index change layers are further disposed between the layers of the light-emitting functional layer.
  • the refractive index change layer is made of an inorganic material.
  • the refractive index change layer has a thickness of less than 50 nm.
  • the luminescent functional layer emits visible light having a wavelength in the range of 500 nm ⁇ 25 nm.
  • the material of the hole injection layer comprises copper phthalocyanine, tetracyano p-dimethylene benzoquinone, phenanthroline-23-dinitrile or titanyl phthalocyanine. Or a variety.
  • the material of the hole transport layer comprises TCTA, F4TCNQ, tetracyano p-dimethylene benzoquinone, phenanthroline-23-dicarbonitrile, copper phthalocyanine or titanyl phthalocyanine.
  • the hole transport layer is a multilayer structure.
  • the material of the light-emitting layer is made of a phosphorescent material, TCTA, and TAZ;
  • the material of the electron transport layer includes quinoline aluminum, batholine, Bphen, TPBi, hydroxyquinolate, One or more of Nbphen;
  • the material of the electron injecting layer includes one or more of lithium fluoride, LiBq4 or Alq3: Li3N.
  • the present invention further provides an OLED display, which comprises the OLED display module according to any of the above embodiments.
  • the OLED display and the display module thereof provided by the present invention satisfy the refractive index between the layers of the luminescent functional layer: the refractive index of the luminescent functional layer material near the cathode plate is much larger than that of the OLED display The refractive index of the adjacent luminescent functional layer material away from the cathode plate improves the technical problem of lowering the contrast and sharpness of the OLED display due to the high cathode reflectance.
  • the technical solution of the present invention further provides a layer between the layers of the luminescent functional layer or The multi-layer refractive index changing layer, the refractive index changing layer is obtained by obtaining a refractive index gradient change, so that the luminescent functional layer satisfies the refractive index change requirement to further improve the OLED display pair due to the high cathode reflectance.
  • FIG. 1 is a schematic structural view of a preferred embodiment of an OLED display module of the present invention.
  • FIG. 2 is a schematic structural view of another preferred embodiment of the OLED display module of the present invention.
  • FIG. 3 is a block diagram showing a preferred embodiment of an OLED display of the present invention.
  • FIG. 1 is a schematic structural diagram of a preferred embodiment of an OLED display module according to the present invention.
  • the OLED display module includes a cathode plate 100, an anode plate 200, and a light-emitting layer disposed between the cathode plate 100 and the anode plate 200.
  • Refractive index Preferably, the luminescent functional layer 300 emits visible light having a wavelength in the range of 500 nm ⁇ 25 nm.
  • the light-emitting function layer 300 sequentially includes, but is not limited to, the following functional layers along the cathode plate 100 to the anode plate 200: an electron injection layer 310, an electron transport layer 320, a light-emitting layer 330, a hole transport layer 340, and hole injection. Layer 350.
  • the technical solution of the present invention is intended to change the structure of the OLED itself, and proposes a new structure for reducing the reflection of the cathode plate 100.
  • the Fresnel formula can be used to derive the intensity of the reflected light in the vertical and horizontal positive directions to satisfy the following formula:
  • n the refractive index of light passing through different media face materials.
  • the refractive index of each functional layer material included in the direction from the cathode plate 100 to the anode plate 200 is n1, n2, n3, n4, n5, n6, n7, ..., and the refractive index thereof satisfies the following relationship: n1 >>n2; n2>>n3; n3>>n4; n4>>n5... Since the light-emitting function layer 300 of the OLED has an N-layer structure, the above inequality needs to satisfy at least N-2.
  • the significance of the above inequality is that the refractive index of the material of the light-emitting function layer 300 close to the cathode plate 100 is always much larger than the refractive index of the material of the light-emitting function layer 300 adjacent to the cathode plate 100 adjacent thereto. The more the above inequality is satisfied, the better the effect.
  • the anode plate 200 is an indium tin oxide coating.
  • the hole injection layer 350 may be made of copper phthalocyanine (CuPc) having good hole injecting ability, or may be F4TCNQ (2,3,5,6-tetrafluoro-7,7,8,-tetracyano) Made of methyl p-benzoquinone), TCNQ (tetracyano p-dimethylene benzoquinone), PPDN (phenanthrphyrin-23-dicarbonitrile) or TiOPC (titanyl phthalocyanine).
  • CuPc copper phthalocyanine
  • F4TCNQ 2,3,5,6-tetrafluoro-7,7,8,-tetracyano
  • TCNQ tetracyano p-dimethylene benzoquinone
  • PPDN phenanthrphyrin-23-dicarbonitrile
  • TiOPC titanium titanyl phthalocyanine
  • the hole transport layer 340 may be made of TCTA (4,4',4"-tris(carbazol-9-yl)triphenylamine) having good hole transporting ability, or may be F4TCNQ (2, 3, 5, 6-tetrafluoro-7,7,8,-tetracyanodimethyl p-benzoquinone), TCNQ (tetracyano p-dimethylene benzoquinone), PPDN (phenanthrphyrin-23-dicarbonitrile), CuPC ( Made of copper phthalocyanine or TiOPC (titanyl phthalocyanine).
  • the hole transport layer 340 may have a multilayer structure, preferably 2-4 layers. And the thickness of each layer can be different.
  • the light-emitting layer 330 may use a mixed main light-emitting layer in which TCTA and TAZ (1,2,4-triazole derivative) are co-doped with a green phosphor material Ir(PPy)3 and a red phosphor material Ir(pq)2acac.
  • the blue light phosphor material FCNIr is used to dope the auxiliary light emitting layer of mCP. According to the principle of colorimetry, the red, green and blue luminescent materials doped in the same luminescent layer will produce white light by color mixing.
  • the electron injection layer 310 can be made of a low work function material such as lithium fluoride (LiF) which has good electron injecting ability, such as LiBq4 (8-hydroxyquinoline boride) or Alq3:Li3N (Li3N as n-type doping
  • LiF lithium fluoride
  • LiBq4 (8-hydroxyquinoline boride
  • Alq3:Li3N Li3N as n-type doping
  • the doping layer is Alq3).
  • the cathode plate 100 is made of aluminum or silver.
  • the conductive performance of the cathode plate 100 can be improved, and the display effect of the display is better.
  • the OLED display module provided in the embodiment has the refractive index between the layers of the light-emitting functional layer being satisfied: the refractive index of the material of the light-emitting functional layer near the cathode plate is much larger than the adjacent The refractive index of the luminescent functional layer material away from the cathode plate improves the technical problem of lowering the contrast and sharpness of the OLED display due to the high cathode reflectance.
  • FIG. 2 is a schematic structural view of another preferred embodiment of the OLED display module of the present invention.
  • the OLED display module in this embodiment also includes a cathode plate 100, an anode plate 200, and a light-emitting function layer 300 disposed between the cathode plate 100 and the anode plate 200; and a refractive index between layers of the light-emitting function layer 300.
  • the refractive index of the luminescent functional layer material near the cathode plate 100 is much larger than the refractive index of the luminescent functional layer material adjacent to the cathode plate 100 adjacent thereto.
  • the light-emitting function layer 300 sequentially includes, but is not limited to, the following functional layers along the cathode plate 100 to the anode plate 200: an electron injection layer 310, an electron transport layer 320, a light-emitting layer 330, a hole transport layer 340, and a hole injection layer 350.
  • the more the inequality is satisfied that is, the larger the downward gradient of the refractive indices of n6, n7, and n8 from n1 to n5 or more, the more the cathode reflection effect can be improved. Therefore, on the basis of the previous embodiment, one or more layers of the refractive index change layer 399 are further added between the layers of the light-emitting function layer 300 to further increase the gradient of the refractive index, thereby further improving. Improve the cathode reflection effect. Only the arrangement of the refractive index change layer 399 is disclosed in FIG. 2, and is not limited to one of the illustrated examples in other embodiments. Different numbers of refractive index change layers 399 may be added according to actual design requirements, which are beyond the scope of the understanding of those skilled in the art.
  • the refractive index change layer 399 is made of an inorganic material.
  • the thickness of the refractive index change layer 399 is generally less than 50 nm.
  • the addition of the refractive index change layer 399 is mainly aimed at improving the refractive index gradient change.
  • the refractive indices of the respective functional layer materials included in the direction from the cathode plate 100 to the anode plate 200 are n1, n2, n3, n4, n5, n6, n7, ..., respectively, and the added refractive index change layer 399
  • the refractive indices in the direction from the cathode plate 100 to the anode plate 200 are sequentially n2', n3', n4', n5'.
  • the refractive index satisfies the following relationship: n1>>n2'; n2'>>n2; n2>>n3'; n3'>>n3; n3>>n4'...
  • the luminescent functional layer 300 and the refractive index changing layer 399 of the OLED are provided with an N-layer structure, and the above inequality needs to satisfy at least N-2.
  • the structure in this embodiment is also designed for the visible light emitting layer 300 to emit visible light having a wavelength range of 500 nm ⁇ 25 nm.
  • the technical characteristics of the material properties, composition, and the like of the anode plate 200, the cathode plate 100, and the respective layers in the light-emitting function layer 300 are the same as those in the previous embodiment, and are not described herein again.
  • the OLED display and the display module thereof provided by the present invention satisfy the refractive index between the layers of the luminescent functional layer: the refractive index of the luminescent functional layer material near the cathode plate is much larger than that of the OLED display The refractive index of the adjacent luminescent functional layer material away from the cathode plate improves the technical problem of lowering the contrast and sharpness of the OLED display due to the high cathode reflectance.
  • the technical solution of the present invention further provides a layer between the layers of the luminescent functional layer or The multi-layer refractive index changing layer, the refractive index changing layer is obtained by changing the refractive index gradient so that the luminescent functional layer satisfies the refractive index change requirement to further improve the technical problem of lowering the contrast and sharpness of the OLED display due to the high cathode reflectance. .
  • FIG. 3 is a schematic structural diagram of a preferred embodiment of the OLED display of the present invention.
  • the OLED display includes a housing 800 and an OLED display module described in the above embodiment disposed inside the housing 800.
  • OLED display module described in the above embodiment disposed inside the housing 800.

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Abstract

一种OLED显示器及其显示模组，该OLED显示模组包括：阴极板、阳极板以及设于阴极板和阳极板之间的发光功能层，发光功能层的各层之间的折射率满足以下关系：靠近阴极板的发光功能层材料的折射率要远大于与之相邻的远离阴极板的发光功能层材料的折射率。

Description

OLED显示器及其显示模组 【技术领域】
本发明涉及OLED显示的技术领域，具体是涉及一种OLED显示器及其显示模组。
【背景技术】
有机发光二极管(OLED)器件一般由阴极、阳极和发光层组成。阴极一般采用Al等金属材料制成，而阳极一般采用ITO等材料制成。电子和空穴分别从阴极和阳极注入，在有机发光层形成激子并激发发光层材料发光。目前实验室的产品多以透明阳极ITO为主，此时器件结构呈现出顶发射(Top emission)的状态，而生产线由于ITO蒸镀对有机材料的破坏，往往将其置于底部，从而采用底发光(Bottom emission)的结构，即光线从阴极射出。
由于现行多数OLED采用阳极发光结构，阴极成为反射层，导致环境光或内部杂散光在射到阴极后发生反射，尤其是阴极多数为金属，反射率较高，从而降低了OLED的对比度和清晰度。业界目前的做法是在OLED出光面上方增加一个1/4波片+偏光片的结构来改善这一反射，但其成本较高。
【发明内容】
本发明实施例提供一种OLED显示器及其显示模组，以解决现有技术中由于阴极反射率高而导致的OLED显示器的对比度和清晰度降低的技术问题。
为解决上述问题，本发明实施例提供了一种OLED显示模组，所述OLED显示模组包括：阴极板、阳极板以及设于所述阴极板和所述阳极板之间的发光功能层，所述发光功能层的各层之间的折射率满足以下关系：靠近所述阴极板的发光功能层材料的折射率要远大于与之相邻的远离所述阴极板的发光功能层材料的折射率。
根据本发明一优选实施例，所述发光功能层沿所述阴极板至所述阳极板方 向依次包括：电子注入层、电子传输层、发光层、空穴传输层以及空穴注入层。
根据本发明一优选实施例，所述发光功能层各层之间还设有一层或多层折射率变化层。
根据本发明一优选实施例，所述折射率变化层为无机材料制成。
根据本发明一优选实施例，所述折射率变化层的厚度小于50nm。
根据本发明一优选实施例，所述发光功能层发出波长范围为500nm±25nm的可见光。
根据本发明一优选实施例，所述空穴注入层的材质包括酞菁铜、四氰代对二亚甲基苯醌、菲啰啉-23-二腈或钛氧基酞菁中的一种或多种。
根据本发明一优选实施例，所述空穴传输层的材质包括TCTA、F4TCNQ、四氰代对二亚甲基苯醌、菲啰啉-23-二腈、酞菁铜或钛氧基酞菁中的一种或多种；所述空穴传输层为多层结构。
根据本发明一优选实施例，所述发光层的材质由磷光材料、TCTA以及TAZ混合而成；所述电子传输层的材质包括喹啉铝、浴铜灵、Bphen、TPBi、羟基喹啉锂、Nbphen中的一种或多种；所述电子注入层的材质包括氟化锂、LiBq4或Alq3：Li3N中的一种或多种。
为解决上述技术问题，本发明还提供一种OLED显示器，所述OLED显示器包括上述实施例中任一项所述的OLED显示模组。
相对于现有技术，本发明提供的OLED显示器及其显示模组，通过使发光功能层的各层之间的折射率满足：靠近阴极板的发光功能层材料的折射率要远大于与之相邻的远离阴极板的发光功能层材料的折射率，来改善由于阴极反射率高而导致的OLED显示器的对比度和清晰度降低的技术问题。另外，为了进一步地满足发光功能层材料的折射率远大于与之相邻的远离阴极板的发光功能层材料的折射率，本发明技术方案还在发光功能层各层之间还设置一层或多层折射率变化层，折射率变化层在于获得折射率梯度变化，使得发光功能层满足折射率变化要求，以进一步改善由于阴极反射率高而导致的OLED显示器的对 比度和清晰度降低的技术问题。
【附图说明】
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本发明OLED显示模组一优选实施例的结构示意图；
图2是本发明OLED显示模组另一优选实施例的结构示意图；以及
图3是本发明OLED显示器一优选实施例的结构简图。
【具体实施方式】
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅是本发明的一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其它实施例，都属于本发明保护的范围。
请参阅图1，图1为本发明OLED显示模组一优选实施例的结构示意图，该OLED显示模组包括：阴极板100、阳极板200以及设于阴极板100和阳极板200之间的发光功能层300；发光功能层300的各层之间的折射率满足以下关系：靠近阴极板100的发光功能层材料的折射率要远大于与之相邻的远离阴极板100的发光功能层材料的折射率。优选地，发光功能层300发出波长范围为500nm±25nm的可见光。
具体而言，该发光功能层300沿阴极板100至阳极板200方向依次包括但不限于以下功能层：电子注入层310、电子传输层320、发光层330、空穴传输层340以及空穴注入层350。
本发明技术方案意图是针对OLED本身的结构进行变化，提出了一种新的降低阴极板100反射的结构。我们从穿透的光学理论菲涅尔公式可以推得反射光在垂直和水平偏正方向上的强度满足以下公式：
Figure PCTCN2015098973-appb-000001
Figure PCTCN2015098973-appb-000002
其中，Rs表示为垂直偏正方向上的光强度，Rp表示为水平偏正方向上的光强度，θ为入射和出射光角度。n表示光通过不同介质面材料的折射率。
假设沿阴极板100至阳极板200方向所包括的各功能层材料的折射率依次为n1、n2、n3、n4、n5、n6、n7......，其折射率满足以下关系：n1＞＞n2；n2＞＞n3；n3＞＞n4；n4＞＞n5......由于OLED的发光功能层300有N层结构，则上述不等式最少需要满足N-2个。上述不等式的意义在于，靠近阴极板100的发光功能层300材料的折射率总要远大于与它相邻的远离阴极板100的发光功能层300材料的折射率。而上述不等式满足地越多，效果越好。
优选地，阳极板200为氧化铟锡涂层。而空穴注入层350可以使用具有良好空穴注入能力的酞菁铜(CuPc)制成，也可以为F4TCNQ(2，3，5，6-四氟-7，7，8，-四氰二甲基对苯醌)、TCNQ(四氰代对二亚甲基苯醌)、PPDN(菲啰啉-23-二腈)或TiOPC(钛氧基酞菁)制成。
空穴传输层340可以使用良好的空穴传输能力的TCTA(4，4′，4″-三(咔唑-9-基)三苯胺)制成，也可以为F4TCNQ(2，3，5，6-四氟-7，7，8，-四氰二甲基对苯醌)、TCNQ(四氰代对二亚甲基苯醌)、PPDN(菲啰啉-23-二腈)、CuPC(酞菁铜)或TiOPC(钛氧基酞菁)制成。
优选地，该空穴传输层340可以为多层结构，优选为2-4层。且每一层的厚度可以不同。发光层330可以使用由绿光磷光材料Ir(PPy)3与红光磷光材料Ir(pq)2acac共掺杂TCTA与TAZ(1，2，4-三唑衍生物)的混合式主发光层，同时使用蓝光磷光材料FCNIr掺杂mCP的辅发光层。根据色度学原理，其中红，绿，蓝三色发光材料掺杂于同一发光层中将会通过混色而产生白光。
电子传输层320可以使用良好的电子传输能力的喹啉铝(Alq3)制成，也可以为BCP(浴铜灵)、Bphen(4，7一二苯基-1，10-邻二氮杂菲)、TPBi(1，3，5- 三(N-苯基苯并咪唑-2-基)苯)、Liq(羟基喹啉锂)、Nbphen(2，9-二(2-萘基)-4，7-二苯基-1，10-菲啰啉)或TAZ(1，2，4-三唑衍生物)制成。
电子注入层310可以使用良好的电子注入能力的氟化锂(LiF)等低功函材料制成，又如LiBq4(8-羟基喹啉硼化锂)或Alq3：Li3N(Li3N作为n型掺杂剂，掺杂层为Alq3)。
优选地，阴极板100为铝或者银材质制成。可以提高阴极板100的导电性能，使显示器的显示效果更优。
相对于现有技术，本实施例中提供的OLED显示模组，通过使发光功能层的各层之间的折射率满足：靠近阴极板的发光功能层材料的折射率要远大于与之相邻的远离阴极板的发光功能层材料的折射率，改善了由于阴极反射率高而导致的OLED显示器的对比度和清晰度降低的技术问题。
请参阅图2，图2是本发明OLED显示模组另一优选实施例的结构示意图。该实施例中的OLED显示模组同样包括：阴极板100、阳极板200以及设于阴极板100和阳极板200之间的发光功能层300；并且发光功能层300的各层之间的折射率满足以下关系：靠近阴极板100的发光功能层材料的折射率要远大于与之相邻的远离阴极板100的发光功能层材料的折射率。发光功能层300沿阴极板100至阳极板200方向依次包括但不限于以下功能层：电子注入层310、电子传输层320、发光层330、空穴传输层340以及空穴注入层350。
从上一实施例中可知，不等式满足的越多，即：从n1向n5或更多的n6、n7、n8折射率的向下梯度变化越大，则越能改善阴极反射效果。因此，该实施例在上一实施例的基础上，在发光功能层300各层之间还增设有一层或多层折射率变化层399，以进一步增大折射率的变化梯度，进而更好的改善阴极反射效果。图2中只揭示出了一种折射率变化层399的设置形式，在其他实施例中并不限于该图示中的一种情况。可以根据实际设计需求，增设不同数量的折射率变化层399，在本领域技术人员的理解范围内，此处不再详述。
优选地，该折射率变化层399为无机材料制成。折射率变化层399的厚度一般小于50nm。增设折射率变化层399主要目的在于改善折射率梯度变化。假设沿阴极板100至阳极板200方向所包括的各功能层材料的折射率依次为n1、n2、n3、n4、n5、n6、n7......，而增设的折射率变化层399沿阴极板100至阳极板200方向的折射率依次为n2’、n3’、n4’、n5’......。其折射率满足以下关系：n1＞＞n2’；n2’＞＞n2；n2＞＞n3’；n3’＞＞n3；n3＞＞n4’......同样的，假设 OLED的发光功能层300和折射率变化层399一共设置有N层结构，则上述不等式最少需要满足N-2个。
在本实施例中的结构同样是针对发光功能层300发出波长范围为500nm±25nm的可见光进行设计。另外，阳极板200、阴极板100以及发光功能层300中的各层的材料性质、组成等技术特征与上一实施例相同，此处不再赘述。
相对于现有技术，本发明提供的OLED显示器及其显示模组，通过使发光功能层的各层之间的折射率满足：靠近阴极板的发光功能层材料的折射率要远大于与之相邻的远离阴极板的发光功能层材料的折射率，来改善由于阴极反射率高而导致的OLED显示器的对比度和清晰度降低的技术问题。另外，为了进一步地满足发光功能层材料的折射率远大于与之相邻的远离阴极板的发光功能层材料的折射率，本发明技术方案还在发光功能层各层之间还设置一层或多层折射率变化层，折射率变化层在于获得折射率梯度变化，使得发光功能层满足折射率变化要求，以进一步改善由于阴极反射率高而导致的OLED显示器的对比度和清晰度降低的技术问题。
另外，本发明实施例还提供一种OLED显示器，请参阅图3，图3是本发明OLED显示器一优选实施例的结构简图。其中，该OLED显示器包括壳体800以及设于壳体800内部的上述实施例中所述的OLED显示模组。关于OLED显示模组的技术特征请参阅上述实施例中的详细描述，而OLED显示器的其他部分结构技术特征，在本领域技术人员的理解范围内，此处亦不再赘述。
以上所述仅为本发明的一种实施例，并非因此限制本发明的保护范围，凡是利用本发明说明书及附图内容所作的等效装置或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (19)

  1. 一种OLED显示模组，所述OLED显示模组包括：阴极板、阳极板以及设于所述阴极板和所述阳极板之间的发光功能层，其特征在于，所述发光功能层的各层之间的折射率满足以下关系：靠近所述阴极板的发光功能层材料的折射率要远大于与之相邻的远离所述阴极板的发光功能层材料的折射率，其中，所述发光功能层沿所述阴极板至所述阳极板方向依次包括：电子注入层、电子传输层、发光层、空穴传输层以及空穴注入层；所述发光功能层各层之间还设有一层或多层折射率变化层。
  2. 一种OLED显示模组，所述OLED显示模组包括：阴极板、阳极板以及设于所述阴极板和所述阳极板之间的发光功能层，其特征在于，所述发光功能层的各层之间的折射率满足以下关系：靠近所述阴极板的发光功能层材料的折射率要远大于与之相邻的远离所述阴极板的发光功能层材料的折射率。
  3. 根据权利要求2所述的OLED显示模组，其特征在于，所述发光功能层沿所述阴极板至所述阳极板方向依次包括：电子注入层、电子传输层、发光层、空穴传输层以及空穴注入层。
  4. 根据权利要求2所述的OLED显示模组，其特征在于，所述发光功能层各层之间还设有一层或多层折射率变化层。
  5. 根据权利要求4所述的OLED显示模组，其特征在于，所述折射率变化层为无机材料制成。
  6. 根据权利要求4所述的OLED显示模组，其特征在于，所述折射率变化层的厚度小于50nm。
  7. 根据权利要求2所述的OLED显示模组，其特征在于，所述发光功能层发出波长范围为500nm±25nm的可见光。
  8. 根据权利要求3所述的OLED显示模组，其特征在于，所述空穴注入层的材质包括酞菁铜、四氰代对二亚甲基苯醌、菲哕啉-23-二腈或钛氧基酞菁中的一种或多种。
  9. 根据权利要求3所述的OLED显示模组，其特征在于，所述空穴传输层的材质包括TCTA、F4TCNQ、四氰代对二亚甲基苯醌、菲哕啉-23-二腈、酞菁铜或钛氧基酞菁中的一种或多种；所述空穴传输层为多层结构。
  10. 根据权利要求3所述的OLED显示模组，其特征在于，所述发光层的材质由磷光材料、TCTA以及TAZ混合而成；所述电子传输层的材质包括喹啉铝、浴铜灵、Bphen、TPBi、羟基喹啉锂、Nbphen中的一种或多种；所述电子注入层的材质包括氟化锂、LiBq4或Alq3：Li3N中的一种或多种。
  11. 一种OLED显示器，其特征在于，所述OLED显示器包括OLED显示模组，所述OLED显示模组包括：阴极板、阳极板以及设于所述阴极板和所述阳极板之间的发光功能层，其特征在于，所述发光功能层的各层之间的折射率满足以下关系：靠近所述阴极板的发光功能层材料的折射率要远大于与之相邻的远离所述阴极板的发光功能层材料的折射率。
  12. 根据权利要求11所述的OLED显示器，其特征在于，所述发光功能层沿所述阴极板至所述阳极板方向依次包括：电子注入层、电子传输层、发光层、空穴传输层以及空穴注入层。
  13. 根据权利要求11所述的OLED显示器，其特征在于，所述发光功能层各层之间还设有一层或多层折射率变化层。
  14. 根据权利要求13所述的OLED显示器，其特征在于，所述折射率变化层为无机材料制成。
  15. 根据权利要求13所述的OLED显示器，其特征在于，所述折射率变化层的厚度小于50nm。
  16. 根据权利要求11所述的OLED显示器，其特征在于，所述发光功能层发出波长范围为500nm±25nm的可见光。
  17. 根据权利要求12所述的OLED显示器，其特征在于，所述空穴注入层的材质包括酞菁铜、四氰代对二亚甲基苯醌、菲哕啉-23-二腈或钛氧基酞菁中的一种或多种。
  18. 根据权利要求12所述的OLED显示器，其特征在于，所述空穴传输层的材质包括TCTA、F4TCNQ、四氰代对二亚甲基苯醌、菲哕啉-23-二腈、酞菁铜或钛氧基酞菁中的一种或多种；所述空穴传输层为多层结构。
  19. 根据权利要求12所述的OLED显示器，其特征在于，所述发光层的材质由磷光材料、TCTA以及TAZ混合而成；所述电子传输层的材质包括喹啉铝、浴铜灵、Bphen、TPBi、羟基喹啉锂、Nbphen中的一种或多种；所述电子注入层的材质包括氟化锂、LiBq4或Alq3：Li3N中的一种或多种。
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