CN110323249B - Organic electroluminescent display device - Google Patents
Organic electroluminescent display device Download PDFInfo
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- CN110323249B CN110323249B CN201810277460.7A CN201810277460A CN110323249B CN 110323249 B CN110323249 B CN 110323249B CN 201810277460 A CN201810277460 A CN 201810277460A CN 110323249 B CN110323249 B CN 110323249B
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- 230000003287 optical effect Effects 0.000 claims abstract description 53
- 239000000758 substrate Substances 0.000 claims abstract description 48
- 238000000605 extraction Methods 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 13
- PQXKHYXIUOZZFA-UHFFFAOYSA-M lithium fluoride Chemical group [Li+].[F-] PQXKHYXIUOZZFA-UHFFFAOYSA-M 0.000 claims description 5
- 239000003086 colorant Substances 0.000 claims description 4
- 230000004075 alteration Effects 0.000 abstract description 8
- 230000005540 biological transmission Effects 0.000 abstract description 8
- 230000000007 visual effect Effects 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000003750 conditioning effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000002269 spontaneous effect Effects 0.000 description 2
- 230000008033 biological extinction Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005401 electroluminescence Methods 0.000 description 1
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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
- H10K59/50—OLEDs integrated with light modulating elements, e.g. with electrochromic elements, photochromic elements or liquid crystal elements
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- Electroluminescent Light Sources (AREA)
Abstract
The invention relates to the technical field of display, and discloses an organic electroluminescent display device which comprises a substrate, an anode arranged on the substrate, an organic light-emitting layer arranged on one side of the anode, which is far away from the substrate, and an optical adjusting layer which is arranged in the edge area of the light-emitting path of the organic light-emitting layer and is used for adjusting the angle of light emitted by the organic light-emitting layer, wherein the organic light-emitting layer is provided with the optical adjusting layer which is arranged in the edge area of the light-emitting path of the organic light-emitting layer, the refractive index of the organic light-emitting layer is greater than that of the optical adjusting layer, under the condition of not changing the optical transmission path under the normal viewing angle, the offset angle of emergent rays under a large viewing angle is increased, the optical transmission path under the large viewing angle is changed, and further correcting the lower color coordinate of the large visual angle while ensuring the accuracy of the color code of the positive visual angle, thereby reducing the chromatic aberration of the large visual angle.
Description
Technical Field
The invention relates to the technical field of display, in particular to an organic electroluminescent display device.
Background
Currently, top emission organic electroluminescent display panels (OLEDs) generally employ electroluminescent devices having a microcavity structure. The microcavity effect, which is generated by multi-beam resonance, is manifested in that the spontaneous emission of the luminescent material at the resonance wavelength is enhanced, and the spontaneous emission not at the resonance wavelength is suppressed. The value of the light-emitting wavelength λ of the resonant cavity is related to the viewing angle θ, and when the viewing angle θ increases, λ decreases, the emergent light blue shifts, and the intensity decreases, so that the top-emitting OLED display screen has a problem of large viewing angle chromatic aberration (JNCD).
Disclosure of Invention
The invention provides an organic electroluminescent display device which can correct the color coordinates under a large viewing angle while ensuring the accuracy of the color scale of a positive viewing angle, thereby reducing the chromatic aberration under the large viewing angle.
In order to achieve the purpose, the invention provides the following technical scheme:
an organic electroluminescent display device comprises a substrate, an anode arranged on the substrate, an organic light emitting layer arranged on one side of the substrate and deviated from the anode, and an optical adjusting layer arranged in the edge area of a light emitting path of the organic light emitting layer and used for adjusting the angle of light emitted by the organic light emitting layer, wherein the refractive index of the organic light emitting layer is greater than that of the optical adjusting layer.
The organic electroluminescent display device comprises a substrate, an anode arranged on the substrate, an organic light emitting layer arranged on one side of the anode, which is far away from the substrate, and an optical adjusting layer which is arranged in the edge area of a light emitting path of the organic light emitting layer and is used for adjusting the angle of light emitted by the organic light emitting layer, wherein the refractive index of the organic light emitting layer is greater than that of the optical adjusting layer. According to the organic electroluminescence display device, the optical adjusting layer located in the edge area of the light emitting path of the organic light emitting layer is arranged, the refractive index of the organic light emitting layer is larger than that of the optical adjusting layer, under the condition that the light transmission path under the front viewing angle is not changed, the deviation angle of emergent rays under the large viewing angle is increased, the light transmission path under the large viewing angle is changed, the color coordinates under the large viewing angle are corrected while the accuracy of the color codes of the front viewing angle is guaranteed, and therefore the chromatic aberration under the large viewing angle is reduced.
Preferably, the organic light emitting layer includes a plurality of sub-pixel units for emitting light, a surface of each sub-pixel unit facing away from the substrate is an effective light emitting area for emitting light, an interval area existing between the effective light emitting areas is an ineffective area, a projection of the optical adjustment layer on the substrate is located in a projection of the ineffective area on the substrate, and a surface of the optical adjustment layer facing away from the substrate is higher than a surface of the organic light emitting layer facing away from the substrate.
Preferably, the organic light-emitting device further comprises an electron transport layer formed on the side of the organic light-emitting layer, which faces away from the substrate, and a cathode formed on the side of the electron transport layer, which faces away from the organic light-emitting layer; wherein,
the optical adjusting layer is positioned between the organic light-emitting layer and the electron transport layer; and/or the presence of a gas in the gas,
the optical adjusting layer is positioned between the electron transport layer and the cathode; and/or the presence of a gas in the gas,
the optical adjusting layer is positioned on one side of the cathode, which is far away from the electron transmission layer.
Preferably, the organic light emitting device further comprises a light extraction layer formed on a side of the cathode facing away from the organic light emitting layer, and a projection of the light extraction layer on the substrate covers a projection of the effective light emitting region on the substrate.
Preferably, the refractive index of the light extraction layer is greater than the refractive index of the cathode.
Preferably, the optical adjustment layer is formed on a side of the light extraction layer facing away from the organic light emitting layer.
Preferably, when the surface of the optical adjustment layer facing away from the substrate is higher than the surface of the electron transport layer, the film layer formed between the organic light emitting layer and the surface of the optical adjustment layer facing away from the substrate is an intermediate film layer, and the refractive index of the organic light emitting layer is greater than that of the intermediate film layer and the refractive index of the intermediate film layer is greater than that of the optical adjustment layer.
Preferably, the material of the optical adjustment layer is lithium fluoride.
Preferably, the material of the optical adjustment layer is the same as the material of the electron transport layer or the material of the light extraction layer.
Preferably, the light emitted by the plurality of sub-pixel units comprises monochromatic light of at least three colors.
Drawings
Fig. 1 is a schematic structural view of an organic electroluminescent display device in the prior art;
fig. 2 is a schematic structural view of an organic electroluminescent display device provided in an embodiment of the present invention;
FIG. 3 is a schematic diagram of a light emitting path of an organic electroluminescent display device according to the prior art;
fig. 4 is a schematic diagram of a light emitting path of an organic electroluminescent display device according to an embodiment of the present invention.
Icon:
1-an anode; 2-an organic light-emitting layer; 21-a sub-pixel unit; 3-an optical conditioning layer; 4-intermediate film layer; a-an effective light emitting region; b-null area.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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 invention.
Referring to fig. 1 and fig. 2, the present invention provides an organic electroluminescent display device, which includes a substrate, an anode 1 disposed on the substrate, an organic light emitting layer 2 disposed on a side of the anode 1 away from the substrate, and an optical adjusting layer 3 disposed in an edge region of a light emitting path of the organic light emitting layer 2 for adjusting an angle of light emitted from the organic light emitting layer 2, wherein a refractive index of the organic light emitting layer 2 is greater than a refractive index of the optical adjusting layer 3.
The organic electroluminescent display device provided by the above embodiment of the invention includes a substrate, an anode 1 disposed on the substrate, and an organic light emitting layer 2 disposed on a side of the anode away from the substrate, and further includes an optical adjusting layer 3 located in an edge region of a light emitting path of the organic light emitting layer 2 and used for adjusting an angle of light emitted from the organic light emitting layer 2, where a refractive index of the organic light emitting layer 2 is greater than a refractive index of the optical adjusting layer 3. As shown in fig. 1, a schematic structural diagram of an organic electroluminescent display device in the prior art is shown, and in the organic electroluminescent display device provided in an embodiment of the present invention, as shown in fig. 2, by providing an optical adjustment layer 3 located in an edge region in a light emitting path of an organic light emitting layer 2, and setting a refractive index of the organic light emitting layer 2 to be greater than a refractive index of the optical adjustment layer 3, under a condition that a light transmission path under a front viewing angle is not changed, an offset angle of emergent light under the large viewing angle is increased, the light transmission path under the large viewing angle is changed, and then a color coordinate under the large viewing angle is corrected while an accuracy of a color scale of the front viewing angle is ensured, so that chromatic aberration under the large viewing angle is reduced.
Specifically, as shown in fig. 1, the organic light emitting layer 2 includes a plurality of sub-pixel units 21 for emitting light, a surface of each sub-pixel unit 21 facing away from the substrate is an effective light emitting area a for emitting light, and an interval area existing between the effective light emitting areas a is an ineffective area B, as shown in fig. 2, a projection of the optical adjustment layer 3 on the substrate is located in a projection of the ineffective area B on the substrate, and a surface of the optical adjustment layer 3 facing away from the substrate is higher than a surface of the organic light emitting layer 2 facing away from the substrate.
Fig. 3 shows a light emitting path when the first optical adjustment layer is not disposed in the organic electroluminescent display device in the prior art, and fig. 4 shows a light emitting path when the first optical adjustment layer is disposed in the embodiment of the present invention, and it can be seen from the figure that the light emitting path at a large viewing angle in fig. 4 is more effective than the light emitting path at a large viewing angle in fig. 3.
Specifically, the organic electroluminescent display device provided by the embodiment of the present invention further includes an electron transport layer formed on a side of the organic light emitting layer 2 away from the substrate, and a cathode formed on a side of the electron transport layer away from the organic light emitting layer 2; wherein,
the optical adjusting layer 3 is positioned between the organic light-emitting layer and the electron transport layer; and/or the presence of a gas in the gas,
the optical adjusting layer 3 is positioned between the electron transport layer and the cathode; and/or the presence of a gas in the gas,
the optically modifying layer 3 is located on the side of the cathode facing away from the electron transport layer.
Specifically, the organic electroluminescent display device provided by the embodiment of the present invention further includes a light extraction layer formed on a side of the cathode away from the organic light emitting layer 2, and a projection of the light extraction layer on the substrate covers a projection of the effective light emitting area a on the substrate. The light extraction layer has large refractive index and small extinction coefficient, and can improve light extraction. Preferably, the refractive index of the light extraction layer is greater than the refractive index of the cathode.
In particular, the optical conditioning layer may also be formed on the side of the light extraction layer facing away from the organic light-emitting layer 2. And the color coordinates under the large visual angle are corrected while the accuracy of the color scale of the positive visual angle is ensured, so that the chromatic aberration under the large visual angle is reduced.
Specifically, in the organic electroluminescent display device provided by the embodiment of the present invention, when the surface of the optical adjustment layer 3 facing away from the substrate is higher than the surface of the electron transport layer, the film layer formed between the organic light emitting layer 2 and the surface of the optical adjustment layer facing away from the substrate is the intermediate film layer 4, and preferably, the refractive index of the organic light emitting layer 2 is greater than the refractive index of the intermediate film layer 4 and the refractive index of the intermediate film layer 4 is greater than the refractive index of the optical adjustment layer 3, so that the light transmission path at a large viewing angle is changed, and chromatic aberration at a large viewing angle is reduced, as shown in fig. 4.
It should be noted that the intermediate film layer 4 in fig. 4 only shows one layer, but the intermediate film layer 4 may include all the film layers between the surface of the optical adjustment layer 3 facing away from the substrate and the organic light emitting layer. For example, the organic film layer 4 may include an electron transport layer, a cathode, and a light extraction layer.
In the organic electroluminescent display device provided by the above embodiment of the invention, the material of the optical adjustment layer 3 may be lithium fluoride (LiF). Alternatively, the material of the optical adjustment layer 3 may also be selected to be the same material as the electron transport layer or the second optical adjustment layer.
In practical application, the embodiment of the invention controls the length of the resonant cavity under a large viewing angle by adjusting the thickness and the material of the optical adjusting layer 3, thereby correcting the color coordinate of the resonant cavity and reducing chromatic aberration under the large viewing angle.
In the organic electroluminescent display device according to the above-described embodiment of the present invention, the light emitted from the plurality of sub-pixel units 21 includes monochromatic light of at least three colors, for example, the light emitted from the plurality of sub-pixel units includes monochromatic light of three colors, i.e., red, green, and blue.
It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (5)
1. An organic electroluminescent display device comprises a substrate, an anode arranged on the substrate, and an organic light emitting layer arranged on one side of the anode, which is far away from the substrate, and is characterized by further comprising an optical adjusting layer which is positioned in the edge area of the light emitting path of the organic light emitting layer and is used for adjusting the angle of light rays emitted by the organic light emitting layer, wherein the refractive index of the organic light emitting layer is greater than that of the optical adjusting layer;
the organic light-emitting layer comprises a plurality of sub-pixel units for emitting light, the surface of each sub-pixel unit, which is far away from the substrate, is an effective light emitting area for emitting light, an interval area existing between the effective light emitting areas is an ineffective area, the projection of the optical adjusting layer on the substrate is positioned in the projection of the ineffective area on the substrate, and the surface of the optical adjusting layer, which is far away from the substrate, is higher than the surface of the organic light-emitting layer, which is far away from the substrate;
the organic light emitting diode further comprises an electron transport layer formed on one side, away from the substrate, of the organic light emitting layer, a cathode formed on one side, away from the organic light emitting layer, of the electron transport layer, and a light extraction layer formed on one side, away from the organic light emitting layer, of the cathode, wherein the projection of the light extraction layer on the substrate covers the projection of the effective light emitting area on the substrate, the refractive index of the light extraction layer is larger than that of the cathode, and the optical adjustment layer is formed on one side, away from the organic light emitting layer, of the light extraction layer.
2. The organic electroluminescent display device according to claim 1, wherein a film layer formed between the organic light emitting layer and a surface of the optical adjustment layer facing away from the substrate is an intermediate film layer, and a refractive index of the organic light emitting layer is greater than a refractive index of the intermediate film layer and a refractive index of the intermediate film layer is greater than a refractive index of the optical adjustment layer.
3. The organic electroluminescent display device according to claim 1, wherein the material of the optical adjustment layer is lithium fluoride.
4. The organic electroluminescent display device according to claim 1, wherein the material of the optical adjustment layer is the same as an electron transport layer material or a light extraction layer material.
5. The organic electroluminescent display device according to claim 1, wherein the light emitted from the plurality of sub-pixel units comprises monochromatic light of at least three colors.
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| CN113629214B (en) * | 2021-08-06 | 2023-12-26 | 武汉天马微电子有限公司 | Display panel, manufacturing method thereof and display device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101647134A (en) * | 2007-03-30 | 2010-02-10 | 密执安州立大学董事会 | OLED with improved light outcoupling |
| CN104396345A (en) * | 2012-06-20 | 2015-03-04 | 日本先锋公司 | Organic electroluminescence device |
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| KR20160034457A (en) * | 2014-09-19 | 2016-03-30 | 삼성디스플레이 주식회사 | Organic light emitting diode device |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101647134A (en) * | 2007-03-30 | 2010-02-10 | 密执安州立大学董事会 | OLED with improved light outcoupling |
| CN104396345A (en) * | 2012-06-20 | 2015-03-04 | 日本先锋公司 | Organic electroluminescence device |
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