CN111769208A - Array substrate and display device - Google Patents
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- CN111769208A CN111769208A CN202010668442.9A CN202010668442A CN111769208A CN 111769208 A CN111769208 A CN 111769208A CN 202010668442 A CN202010668442 A CN 202010668442A CN 111769208 A CN111769208 A CN 111769208A
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- 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
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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
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- H10K59/12—Active-matrix OLED [AMOLED] displays
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Abstract
The disclosure provides an array substrate and a display device, and belongs to the technical field of display. The array substrate comprises a substrate, a light-emitting diode layer and a first light extraction layer which are sequentially stacked, wherein the light-emitting diode layer is arranged on one side of the substrate and comprises a plurality of organic light-emitting diodes for emitting light rays with different colors; the first light extraction layer is arranged on one side of the light-emitting diode layer far away from the substrate; the material of the first light extraction layer is a negative dispersion material in a visible light waveband. The array substrate can improve the light emitting efficiency of each organic light emitting diode.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to an array substrate and a display device.
Background
In order to improve the light extraction efficiency of a top emission type OLED (organic electroluminescent device), a light extraction layer may be provided at the light extraction side of the OLED. However, the display panel is provided with a plurality of OLEDs with different colors, and the OLEDs with different colors have different requirements on the thickness of the light extraction layer, which results in that the light extraction layer cannot meet the light emission requirements of the OLEDs with different colors, and restricts the overall light emission efficiency of the display panel.
The above information disclosed in the background section is only for enhancement of understanding of the background of the present disclosure and therefore it may contain information that does not constitute prior art that is known to a person of ordinary skill in the art.
Disclosure of Invention
The present disclosure is directed to an array substrate and a display device, which improve light extraction efficiency of each organic electroluminescent diode.
In order to achieve the purpose, the technical scheme adopted by the disclosure is as follows:
according to a first aspect of the present disclosure, there is provided an array substrate including:
a substrate base plate;
the light-emitting diode layer is arranged on one side of the substrate and comprises a plurality of organic light-emitting diodes for emitting light rays with different colors;
the first light extraction layer is arranged on one side, far away from the substrate, of the light-emitting diode layer; the material of the first light extraction layer is a negative dispersion material in a visible light waveband.
In one exemplary embodiment of the present disclosure, the material of the first light extraction layer has an extinction coefficient of less than 0.08 in a visible light band.
In an exemplary embodiment of the present disclosure, the negative dispersion material includes one or more of PbSe, PbS, ZnS, ZnSe, PbTe.
In an exemplary embodiment of the present disclosure, the first light extraction layer has a thickness of a first thickness d1(ii) a The organic electroluminescent diode comprises a red organic electroluminescent diode for emitting red light, a green organic electroluminescent diode for emitting green light and a blue organic electroluminescent diode for emitting blue light;
the wavelength of the light-emitting peak of the red organic electroluminescent diode is a first wavelength lambdaR(ii) a The wavelength of the light-emitting peak of the green organic electroluminescent diode is a second wavelength lambdaG(ii) a The wavelength of the light-emitting peak of the blue organic electroluminescent diode is a third wavelength lambdaB；
The first light extraction layer has a wavelength of the first wavelength λRHas a refractive index of the light of the first refractive index n1The first light extraction layer has a wavelength of the second wavelength λGHas a refractive index of the light of the second refractive index n2The first light extraction layer has a wavelength of the third wavelength λBHas a refractive index of the third refractive index n3；
The emergent angle of the red organic electroluminescent diode is 0 degree and the wavelength is the first wavelength lambdaRThe optical path in the red organic electroluminescent diode is a first light-emitting optical path LR；
The emergent angle of the green organic electroluminescent diode is 0 degree and the wavelength is the second wavelength lambdaGThe optical path in the green organic electroluminescent diode is a second light-emitting optical path LG；
The emergent angle of the blue organic electroluminescent diode is 0 degree and the wavelength is the third wavelength lambdaBThe optical path in the blue organic electroluminescent diode is a third light-emitting optical path LB；
(λR/2)×m1-0.2×λR≤LR+n1×d1≤(λR/2)×m1+0.2×λR；
(λG/2)×m2-0.2×λG≤LG+n2×d1≤(λG/2)×m2+0.2×λG；
(λB/2)×m3-0.2×λB≤LB+n3×d1≤(λB/2)×m3+0.2×λB；
Wherein m is1、m2、m3Are all positive integers.
In an exemplary embodiment of the present disclosure, the array substrate further includes:
the second light extraction layer is arranged on one side, away from the substrate base plate, of the first light extraction layer or between the first light extraction layer and the light-emitting diode layer; the material of the second light extraction layer is a positive dispersion material.
In an exemplary embodiment of the present disclosure, the second light extraction layer is disposed on a side of the first light extraction layer away from the substrate, and a refractive index of the first light extraction layer for visible light is smaller than a refractive index of the second light extraction layer for visible light;
or the second light extraction layer is arranged between the first light extraction layer and the light-emitting diode layer, and the refractive index of the first light extraction layer to visible light is larger than that of the second light extraction layer to visible light.
In one exemplary embodiment of the present disclosure, the extinction coefficient of the material of the second light extraction layer in the visible light band is less than 0.08.
In an exemplary embodiment of the present disclosure, the first light extraction layer has a thickness of a first thickness d1(ii) a The thickness of the second light extraction layer is a second thickness d2；
The organic electroluminescent diode comprises a red organic electroluminescent diode for emitting red light, a green organic electroluminescent diode for emitting green light and a blue organic electroluminescent diode for emitting blue light;
the wavelength of the light-emitting peak of the red organic electroluminescent diode is a first wavelength lambdaR(ii) a The wavelength of the light-emitting peak of the green organic electroluminescent diode is a second wavelength lambdaG(ii) a The wavelength of the light-emitting peak of the blue organic electroluminescent diode is a third wavelength lambdaB；
The first light extraction layer has a wavelength of the first wavelength λRHas a refractive index of the light of the first refractive index n1The first light extraction layer has a wavelength of the second wavelength λGHas a refractive index of the light of the second refractive index n2The first light extraction layer has a wavelength of the third wavelength λBHas a refractive index of the third refractive index n3；
The second lightThe wavelength of the extraction layer is the first wavelength lambdaRHas a refractive index of the fourth refractive index n4The second light extraction layer has a wavelength of λ corresponding to the second wavelengthGHas a refractive index of the light of the fifth refractive index n5The second light extraction layer has a wavelength of the third wavelength λBHas a refractive index of the light of the sixth refractive index n6；
The emergent angle of the red organic electroluminescent diode is 0 degree and the wavelength is the first wavelength lambdaRThe optical path in the red organic electroluminescent diode is a first light-emitting optical path LR；
The emergent angle of the green organic electroluminescent diode is 0 degree and the wavelength is the second wavelength lambdaGThe optical path in the green organic electroluminescent diode is a second light-emitting optical path LG；
The emergent angle of the blue organic electroluminescent diode is 0 degree and the wavelength is the third wavelength lambdaBThe optical path in the blue organic electroluminescent diode is a third light-emitting optical path LB；
Wherein (lambda)R/2)×m1-0.2×λR≤LR+n1×d1+n4×d2≤(λR/2)×m1+0.2 ×λR；
(λG/2)×m2-0.2×λG≤LG+n2×d1+n5×d2≤(λG/2)×m2+0.2×λG；
(λB/2)×m3-0.2×λB≤LB+n3×d1+n6×d2≤(λB/2)×m3+0.2×λB；
Wherein m is1、m2、m3Are all positive integers.
In an exemplary embodiment of the present disclosure, the first light extraction layer has a thickness of a first thickness d1(ii) a The first mentionedThe thickness of the two light extraction layers is a second thickness d2；
The organic electroluminescent diode comprises a red organic electroluminescent diode for emitting red light, a green organic electroluminescent diode for emitting green light and a blue organic electroluminescent diode for emitting blue light;
the wavelength of the light-emitting peak of the red organic electroluminescent diode is a first wavelength lambdaR(ii) a The wavelength of the light-emitting peak of the green organic electroluminescent diode is a second wavelength lambdaG(ii) a The wavelength of the light-emitting peak of the blue organic electroluminescent diode is a third wavelength lambdaB；
The first light extraction layer has a wavelength of the first wavelength λRHas a refractive index of the light of the first refractive index n1The first light extraction layer has a wavelength of the second wavelength λGHas a refractive index of the light of the second refractive index n2The first light extraction layer has a wavelength of the third wavelength λBHas a refractive index of the third refractive index n3；
The second light extraction layer has a wavelength of the first wavelength λRHas a refractive index of the fourth refractive index n4The second light extraction layer has a wavelength of λ corresponding to the second wavelengthGHas a refractive index of the light of the fifth refractive index n5The second light extraction layer has a wavelength of the third wavelength λBHas a refractive index of the light of the sixth refractive index n6；
Wherein n is1×d1+n4×d2＞n2×d1+n5×d2＞n3×d1+n6×d2。
According to a second aspect of the present disclosure, a display device is provided, which includes the array substrate.
In the array substrate and the display device provided by the present disclosure, the material of the first light extraction layer is a negative dispersion material in the visible light band, that is, the refractive index of the first light extraction layer increases with the increase of the wavelength of the light. Therefore, when the wavelength of light emitted by the organic electroluminescent diode is short, the refractive index of the first light extraction layer to the light is small, so that the optical path of the light passing through the first light extraction layer is small; when the wavelength of the light emitted by the organic electroluminescent diode is longer, the refractive index of the first light extraction layer to the light is larger, so that the optical path of the light when passing through the first light extraction layer is larger. Therefore, the first light extraction layer can optimize the light emission of the organic light-emitting diodes with different colors, so that the optical path of the light at the light emission peak position of the organic light-emitting diodes with different colors is optimal or nearly optimal, and the light emission efficiency of each organic light-emitting diode is improved.
Drawings
The above and other features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.
Fig. 1 is a schematic structural view of an array substrate in the related art.
Fig. 2 is a schematic structural diagram of an array substrate according to an embodiment of the present disclosure.
Fig. 3 is a schematic structural diagram of an array substrate according to an embodiment of the present disclosure.
Fig. 4 is a schematic structural diagram of an array substrate according to an embodiment of the present disclosure.
Fig. 5 is a schematic view of refractive indices of the first light extraction layer and the second light extraction layer according to a wavelength of light according to an embodiment of the present disclosure.
Fig. 6 is a schematic diagram of the change of extinction coefficients of the first light extraction layer and the second light extraction layer with the wavelength of light according to an embodiment of the present disclosure.
Fig. 7 is a schematic light emission diagram of an organic electroluminescent diode according to an embodiment of the present disclosure.
The reference numerals of the main elements in the figures are explained as follows:
010. a light extraction layer; 100. a substrate base plate; 200. a light emitting diode layer; 201. an organic electroluminescent diode; 210. a pixel defining layer; 300. a first light extraction layer; 400. a second light extraction layer; 500. and (7) packaging the layer.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure.
In the drawings, the thickness of regions and layers may be exaggerated for clarity. The same reference numerals denote the same or similar structures in the drawings, and thus detailed descriptions thereof will be omitted.
The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the embodiments of the disclosure can be practiced without one or more of the specific details, or with other methods, components, materials, and so forth. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring the primary technical ideas of the disclosure.
The terms "first" and "second", etc. are used merely as labels, and are not limiting on the number of their objects.
In the related art, an organic electroluminescent diode (OLED) may include a first electrode, a second electrode, and a functional layer interposed between the first electrode and the second electrode, and the functional layer includes an organic light emitting layer therein. The external quantum efficiency of the OLED is affected by various factors, such as the exciton conversion efficiency of the OLED itself, the internal conversion efficiency of the exciton itself, the transmission of light emitted from the OLED in the non-light-emitting direction, the loss of light emitted from the OLED, the plasma effect of the OLED itself on the metal interface, the total reflection effect of the OLED itself on the metal interface, and the like. Under the influence of various factors, the external quantum efficiency of the OLED tends to be much lower than the theoretical light extraction efficiency of the OLED.
As shown in fig. 1, in the related art, in order to improve the light extraction efficiency of the organic electroluminescent diode 201, a light extraction layer 010 may be provided on the light extraction side of the organic electroluminescent diode 201. In the manufacturing process of the display panel, especially in the manufacturing process of the large-sized display panel, an Open Mask (Open Mask) is generally used to evaporate the material of the light extraction layer 010 to form the entire light extraction layer 010; that is, in order to simplify the manufacturing process, the light extraction layer 010 of the display panel is generally a film layer having a uniform thickness. The material of the light extraction layer 010 is a positive dispersion material, that is, its refractive index decreases as the wavelength of light increases.
Therefore, in the related art, the optical paths of the light rays of different colors in the light extraction layer 010 are different; for light with a shorter wavelength, such as blue light emitted from a blue organic electroluminescent diode, the optical path length thereof in the light extraction layer 010 is larger; for light with a longer wavelength, such as red light emitted from a red organic electroluminescent diode, the optical path length in the light extraction layer 010 is smaller. However, according to the principle of the optical resonator, if it is desired to make the light extraction efficiency of the organic electroluminescent diodes of different colors better, the optical path length of the light with shorter wavelength in the light extraction layer 010 should be made smaller, and the optical path length of the light with longer wavelength in the light extraction layer 010 should be made larger. This results in that, in the related art, when the light extraction layer 010 has a uniform thickness, the light extraction layer 010 cannot satisfy the light extraction optimization requirements of the organic electroluminescent diodes of different colors.
In order to solve the above technical problem, the present disclosure provides an array substrate. As shown in fig. 2, the array substrate includes a substrate 100, a light emitting diode layer 200, and a first light extraction layer 300. The led layer 200 is disposed on one side of the substrate 100 and includes a plurality of organic electroluminescent diodes 201 for emitting light of different colors; the first light extraction layer 300 is disposed on a side of the led layer 200 away from the substrate 100; the material of the first light extraction layer 300 is a negative dispersion material in the visible light band.
The array substrate provided by the present disclosure includes a substrate 100, a light emitting diode layer 200, and a first light extraction layer 300, which are sequentially stacked, where the light emitting diode layer 200 includes a plurality of organic electroluminescent diodes 201 for emitting light rays with different colors. The light emitted from the organic electroluminescent diode 201 may exit through the first light extraction layer 300. The material of the first light extraction layer 300 is a negative dispersion material in the visible light band, that is, the refractive index of the first light extraction layer 300 increases as the wavelength of light increases. Therefore, when the wavelength of light emitted from the organic electroluminescent diode 201 is short, the refractive index of the first light extraction layer 300 for the light is small, so that the optical path of the light when passing through the first light extraction layer 300 is small; when the wavelength of the light emitted from the organic electroluminescent diode 201 is long, the refractive index of the first light extraction layer 300 to the light is large, so that the optical path of the light when passing through the first light extraction layer 300 is large. Therefore, the first light extraction layer 300 can simultaneously give consideration to the light extraction optimization of the organic electroluminescent diodes 201 with different colors, so that the optical paths of the light rays at the light extraction peak positions of the organic electroluminescent diodes 201 with different colors are optimal or nearly optimal, the influence of the metal surface plasma effect and the like is reduced, the light extraction efficiency of each organic electroluminescent diode 201 is improved, the light extraction efficiency of the different organic electroluminescent diodes 201 of the array substrate is optimized, the overall light extraction efficiency of the array substrate is improved, the power consumption of the array substrate is reduced, and the service life of the array substrate is prolonged.
The structure, principle and effect of the array substrate provided by the disclosure will be further explained and explained with reference to the accompanying drawings.
The base substrate 100 may be an inorganic base substrate 100 or an organic base substrate 100. For example, in one embodiment of the present disclosure, the material of the substrate 100 may be a glass material such as soda-lime glass (soda-lime glass), quartz glass, or sapphire glass, or may be a metal material such as stainless steel, aluminum, or nickel. In another embodiment of the present disclosure, the material of the substrate 100 may be polymethyl methacrylate (PMMA), Polyvinyl alcohol (PVA), Polyvinyl phenol (PVP), Polyether sulfone (PES), polyimide, polyamide, polyacetal, Polycarbonate (PC), Polyethylene terephthalate (PET), Polyethylene naphthalate (PEN), or a combination thereof. In another embodiment of the present disclosure, the substrate 100 may also be a flexible substrate 100, for example, the material of the substrate 100 may be Polyimide (PI). The substrate 100 may also be a composite of multiple layers of materials, for example, in an embodiment of the present disclosure, the substrate 100 may include a bottom film layer (bottmfilm), a pressure sensitive adhesive layer, a first polyimide layer, and a second polyimide layer, which are sequentially stacked.
As shown in fig. 2, the led layer 200 is disposed on one side of the substrate 100 and includes a plurality of organic electroluminescent diodes 201 for emitting light rays of different colors, and may include at least two of a red organic electroluminescent diode 201 for emitting red light rays, a green organic electroluminescent diode 201 for emitting green light rays, a blue organic electroluminescent diode 201 for emitting blue light rays, a yellow organic electroluminescent diode 201 for emitting yellow light rays, or an organic electroluminescent diode 201 for emitting light rays of other colors, for example. Illustratively, in one embodiment of the present disclosure, the light emitting diode layer 200 may include red organic electroluminescent diodes 201 arranged in an array, green organic electroluminescent diodes 201 arranged in an array, and blue organic electroluminescent diodes 201 arranged in an array.
Any one of the organic electroluminescent diodes 201 may include a first electrode, a functional layer, and a second electrode sequentially stacked on one side of the base substrate 100. One of the first electrode and the second electrode may serve as an anode of the organic electroluminescent diode 201, the anode is used for injecting hole carriers into the functional layer, the other one may serve as a cathode of the organic electroluminescent diode 201, and the cathode is used for injecting electron carriers into the functional layer. The functional layer at least comprises an organic light-emitting layer, and different carriers are compounded in the organic light-emitting layer to generate excitons, so that the organic light-emitting layer emits light. The second electrode is a transparent electrode, and at least part of the light emitted from the organic light emitting layer may sequentially exit through the second electrode and the first light extraction layer 300.
Optionally, the functional layer of the organic electroluminescent diode 201 may further include other auxiliary film layers to improve the light emitting efficiency or the light extraction efficiency of the organic electroluminescent diode 201. These auxiliary film layers may include, but are not limited to, a hole injection layer, a hole transport layer, an electron blocking layer, a hole blocking layer, an electron transport layer, and an electron injection layer, wherein any one of the auxiliary film layers may have a one-layer or multi-layer structure. Further, a hole injection layer, a hole transport layer and an electron blocking layer are disposed between the anode and the organic light emitting layer, and a hole blocking layer, an electron transport layer and an electron injection layer are disposed between the cathode and the organic light emitting layer.
Optionally, the first electrodes of the organic electroluminescent diodes 201 are distributed in an array and insulated from each other. In other words, the led layer 200 may include a pixel electrode layer including a plurality of pixel electrodes distributed in an array, and each pixel electrode may be a first electrode of each organic electroluminescent diode 201 in a one-to-one correspondence.
Alternatively, the second electrodes of the respective organic electroluminescent diodes 201 may be connected to each other to form a whole. In other words, the led layer 200 may include a common electrode layer, and the common electrode layer may include a common electrode, and the common electrode may be multiplexed as the second electrode of each organic electroluminescent diode 201.
Optionally, a reflective electrode may be further disposed on the surface of the first electrode close to the substrate 100, so as to increase the proportion of light emitted from the second electrode by the organic electroluminescent diode 201 and improve the light extraction efficiency of the organic electroluminescent diode 201. Preferably, the material of the reflective electrode may be aluminum.
The first light extraction layer 300 is disposed on a side of the led layer 200 away from the substrate 100; the material of the first light extraction layer 300 is a negative dispersion material in the visible light band. As shown in fig. 5, the refractive index of the negative dispersion material increases as the wavelength of light increases, contrary to the positive dispersion material employed in the related art. The first light extraction layer 300 may be a film layer having a uniform thickness so as to be prepared through an open mask.
Alternatively, the negative dispersion material may include PbSe, PbS, ZnS, ZnSe, PbTe, Ge2Sb2Te5One or more of. Preferably, in one embodiment of the present disclosure, the material of the first light extraction layer 300 is one of PbSe, PbS, ZnS, ZnSe and PbTe, which have a refractive index of 2.32 for light of 450nm, 2.58 for light of 525nm and 2.70 for light of 620nm, and thus is a negative dispersion material in the visible light band.
Alternatively, in one embodiment of the present disclosure, the first light extraction layer 300 is a thin film in an amorphous state, i.e., the negative dispersion material may be in an amorphous state.
Alternatively, the negative dispersion material of the first light extraction layer 300 may have a small extinction coefficient to reduce loss of the outgoing light. Preferably, the extinction coefficient of the negative dispersion material of the first light extraction layer 300 in the visible light band is less than 0.08, so that the emergent light is not substantially lost, and the overall light extraction efficiency of the array substrate is improved. Illustratively, the negative dispersion material of the first light extraction layer 300 may be one or more of PbSe, PbS, ZnS, ZnSe, and PbTe, which have a very small extinction coefficient in the visible light band.
Further preferably, as shown in fig. 6, the negative dispersion material of the first light extraction layer 300 has an extinction coefficient of less than 0.04 in the visible light band.
Optionally, the thickness of the first light extraction layer 300 is a first thickness d1(ii) a The organic electroluminescent diode 201 includes a red organic electroluminescent diode 201 for emitting red light, a green organic electroluminescent diode 201 for emitting green light, and a blue organic electroluminescent diode 201 for emitting blue light;
the wavelength of the light emission peak of the red organic electroluminescent diode 201 is a first wavelength λR(ii) a The wavelength of the light emission peak of the green organic electroluminescent diode 201 is the second wavelength lambdaG(ii) a Blue organic electroluminescent diodeThe wavelength of the light emission peak of the tube 201 is a third wavelength λB；
The first light extraction layer 300 has a first wavelength λRHas a refractive index of the light of the first refractive index n1The first light extraction layer 300 has a second wavelength λGHas a refractive index of the light of the second refractive index n2The first light extraction layer 300 has a third wavelength λBHas a refractive index of the third refractive index n3；
The red organic electroluminescent diode 201 emits light with an emission angle of 0 DEG and a first wavelength lambdaRThe optical path of the light in the red organic electroluminescent diode 201 is a first light-emitting optical path LR(ii) a Wherein, the first light-emitting optical path LRThe wavelength of the light emitted from the exciton recombination center of the red organic electroluminescent diode 201 is a first wavelength lambdaRThe optical path in the organic light-emitting layer, the optical path in the second electrode, and the optical path sum of the optical paths in the respective auxiliary film layers between the organic light-emitting layer and the second electrode.
The green organic electroluminescent diode 201 emits light with an emission angle of 0 ° and a second wavelength λGThe optical path of the light in the green organic electroluminescent diode 201 is a second light-emitting optical path LG(ii) a Wherein, the second light-emitting optical path LGA second wavelength λ of light emitted perpendicularly from exciton recombination center of the green organic electroluminescent diode 201 (emission angle of 0 °)GThe optical path in the organic light-emitting layer, the optical path in the second electrode, and the optical path sum of the optical paths in the respective auxiliary film layers between the organic light-emitting layer and the second electrode.
The blue organic electroluminescent diode 201 emits light with an emission angle of 0 ° and a third wavelength λBThe optical path of the light in the blue organic electroluminescent diode 201 is a third light-emitting optical path LB(ii) a Wherein, the third light-emitting optical path LBA third wavelength λ of light emitted perpendicularly from the exciton recombination center of the blue organic electroluminescent diode 201 (emission angle of 0 °)BOf (2) a lightA line, the sum of the optical paths in the organic light-emitting layer, the optical path in the second electrode, and the optical paths in the respective auxiliary film layers between the organic light-emitting layer and the second electrode.
In an embodiment of the present disclosure, in order to achieve a better optimization effect on the light extraction efficiency of each organic electroluminescent diode 201, it may be that:
(λR/2)×m1-0.2×λR≤LR+n1×d1≤(λR/2)×m1+0.2×λR；
(λG/2)×m2-0.2×λG≤LG+n2×d1≤(λG/2)×m2+0.2×λG；
(λB/2)×m3-0.2×λB≤LB+n3×d1≤(λB/2)×m3+0.2×λB；
wherein m is1、m2、m3Are all positive integers, and m1、m2、m3May be the same or different.
Wherein, the emitting angle of the red organic electroluminescent diode 201 is 0 degree and the wavelength is the first wavelength lambdaRThe total optical length of the light in the red organic electroluminescent diode 201 and the first light extraction layer 300 is LR+n1×d1Total optical path length and lambdaRThe integral multiple of/2 is very close, and according to the principle of an optical resonant cavity, the light can be more efficiently emitted from the red organic electroluminescent diode 201 and the first light extraction layer 300, so that the emission efficiency of the red light in the array substrate is improved.
Wherein the green organic electroluminescent diode 201 emits light with an emission angle of 0 ° and a wavelength of a second wavelength λGThe total optical length of the light in the green organic electroluminescent diode 201 and the first light extraction layer 300 is LG+n2×d1Total optical path length and lambdaGThe integer multiple of/2 is very close, and the light can be more efficient according to the principle of an optical resonant cavityAnd the light is emitted from the green organic electroluminescent diode 201 and the first light extraction layer 300, so that the emission efficiency of green light in the array substrate is improved.
Wherein the blue organic electroluminescent diode 201 emits light with an emission angle of 0 ° and a wavelength of a third wavelength λBThe total optical length of the light rays in the blue organic electroluminescent diode 201 and the first light extraction layer 300 is LB+n3×d1Total optical path length and lambdaBThe integral multiple of/2 is very close, and according to the principle of an optical resonant cavity, the light can be more efficiently emitted from the blue organic electroluminescent diode 201 and the first light extraction layer 300, so that the emission efficiency of the blue light in the array substrate is improved.
Preferably (λ)R/2)×m1-0.1×λR≤LR+n1×d1≤(λR/2)×m1+0.1×λR. Further preferably, (λ)R/2)×m1-0.05×λR≤LR+n1×d1≤(λR/2)×m1+0.05 ×λR。
Preferably (λ)G/2)×m2-0.1×λG≤LG+n2×d1≤(λG/2)×m2+0.1×λG. Further preferably, (λ)G/2)×m2-0.05×λG≤LG+n2×d1≤(λG/2)×m2+0.05 ×λG。
Preferably (λ)B/2)×m3-0.1×λB≤LB+n3×d1≤(λB/2)×m3+0.1×λB. Further preferably, (λ)B/2)×m3-0.05×λB≤LB+n3×d1≤(λB/2)×m3+0.05 ×λB。
The principle and effect of the array substrate of the present disclosure will be further explained and illustrated with a specific design example.
Illustratively, table 1 provides film layer structures and thicknesses of 6 organic electroluminescent diodes 201, such as OLEDs 1 through 6, in the related art. It is understood that the film layer structures and thicknesses of the OLEDs 1-6 are examples in a specific case, and when the film layer structures of the organic electroluminescent diodes 201 are changed or the film layer materials are changed, the thicknesses of the respective film layers may be different from the examples, and the parameters of the light extraction performance, the light emission peak, and the like of the respective organic electroluminescent diodes 201 may also be different from the examples.
Table 1: structure schematic table of OLED 1-OLED 6
The OLEDs 1 to 6 are not the organic electroluminescent diodes 201 disposed on the same array substrate, but are the organic electroluminescent diodes 201 which are independently prepared and have an ideal light emitting effect. The OLED1 is a film layer structure and thickness of the blue organic electroluminescent diode 201 provided with no light extraction layer. The OLED2 is a film layer structure and thickness of the blue organic electroluminescent diode 201 provided with a light extraction layer. The OLED3 is a film layer structure and thickness of the green organic electroluminescent diode 201 provided with no light extraction layer. The OLED4 is a film layer structure and thickness of the green organic electroluminescent diode 201 provided with a light extraction layer. The OLED5 is a film layer structure and thickness of the red organic electroluminescent diode 201 provided with no light extraction layer. The OLED6 is a film layer structure and thickness of the red organic electroluminescent diode 201 provided with a light extraction layer. The emission peak of the OLED1 and the OLED2 had a wavelength of 450 nm; the emission peak of the OLED3 and the OLED4 had a wavelength of 525 nm; the emission peak of the OLED5 and the OLED6 had a wavelength of 620 nm. The material of the light extraction layer was a positive dispersion material having a refractive index of 2.1 for light having a wavelength of 450nm, a refractive index of 1.96 for light having a wavelength of 525nm, and a refractive index of 1.89 for light having a wavelength of 620 nm.
Comparing the OLEDs 1 to 6, it can be seen that the thickness requirements of the light extraction layer are different for the three different colors of red, green, and blue of the organic electroluminescent diode 201 in order to improve the light extraction efficiency of the organic electroluminescent diode 201. The thickness of the light extraction layer of the blue organic electroluminescent diode 201 is 65nm, the thickness of the light extraction layer of the green organic electroluminescent diode 201 is 95nm, and the thickness of the light extraction layer of the red organic electroluminescent diode 201 is 120 nm. In this case, in the case where the thicknesses of the light extraction layers are not uniform, the OLED2, the OLED4, and the OLED6 disposed on the same array substrate cannot be prepared through an open mask process.
Table 2: the optical path requirements of OLED2, OLED4, and OLED6 for the light extraction layer
Referring to table 2, it can be known from the analysis of the light extraction layers of the OLED2, the OLED4 and the OLED6 that in order to make the OLED2 have the most ideal light extraction efficiency, the optical path length of the vertically emergent light with the wavelength of 450nm in the light extraction layer needs to be 136.5 nm; in order to make the OLED4 have the most ideal light extraction efficiency, the optical path length of the vertical emergent light with the wavelength of 525nm in the light extraction layer needs to be 186.2 nm; in order to make the OLED6 have the most ideal light extraction efficiency, it is necessary to make the optical path length of the vertically emergent light with the wavelength of 620nm at the light extraction layer be 226.8 nm. It can be seen that, in order to optimize the light extraction efficiency of the three different colors of red, green and blue organic electroluminescent diodes 201 on the array substrate, the light extraction layer needs to provide a larger optical path for the red organic electroluminescent diode and a smaller optical path for the blue organic electroluminescent diode 201. This requirement is clearly not met when the light extraction layer is made of only positive dispersion material.
In the array substrate provided by the present disclosure, the material of the first light extraction layer 300 is a negative dispersion material, so that under the condition that the thickness of the first light extraction layer 300 is uniform, a larger optical path can be provided for the red organic electroluminescent diode, and a smaller optical path can be provided for the blue organic electroluminescent diode 201, so that the light extraction efficiencies of the red, green and blue organic electroluminescent diodes 201 with three different colors can be closer to an ideal state, and the light extraction efficiency of the array substrate is improved.
As a further example, a negative dispersion material may be selected and the first light extraction layer 300 with a specific thickness may be prepared, such that the first light extraction layer 300 may provide an optical path of 136.5nm for a light ray with a vertical incidence of 450nm, an optical path of 186.2nm for a light ray with a vertical incidence of 525nm, and an optical path of 226.8nm for a light ray with a vertical incidence of 620nm, and then the first light extraction layer 300 may make the light extraction efficiency of the rgb organic electroluminescent diodes 201 ideal.
For example, referring to table 2, if the thickness of the first light extraction layer 300 may be 65nm, an ideal negative dispersion material having a refractive index of 2.1 for a wavelength of 450nm, a refractive index of 2.86 for a wavelength of 525nm, and a refractive index of 3.49 for a wavelength of 620nm may be selected to prepare the first light extraction layer 300, so that the light extraction efficiencies of the rgb three different colors of the organic electroluminescent diode 201 are all ideal. It will be appreciated that similar technical effects can be achieved by selecting other negative dispersion materials that are close to the ideal negative dispersion material.
For another example, in one embodiment of the present disclosure, the first light extraction layer 300 may be Ge2Sb2Te5The thickness of the first light extraction layer 300 may be 78nm, the refractive index at a wavelength of 450nm may be 1.6, the refractive index at a wavelength of 525nm may be 2.3, and the refractive index at a wavelength of 620nm may be 3.1. Thus, the first light extraction layer 300 can provide an optical path of 124.8nm for normal incident light of 450nm, an optical path of 179.4nm for normal incident light of 525nm, and an optical path of 241.8nm for normal incident light of 620nm, which are close to the optimal optical paths.
Of course, even though the first light extraction layer 300 provided in the present disclosure cannot provide the optical path in the ideal state for the vertically incident light emitted by the rgb organic electroluminescent diodes 201, the light extraction efficiency can still be significantly improved compared to the related art. Furthermore, the expected requirements of the light paths that the first light extraction layer 300 can provide by the organic electroluminescent diodes 201 with three different colors of red, green and blue can be adjusted by adjusting the materials, thicknesses, and the like of the film layers in the organic electroluminescent diode 201, so that the first light extraction layer 300 can select an appropriate negative dispersion material to meet the light emission requirements of the organic electroluminescent diodes 201 with three different colors of red, green and blue as much as possible.
Optionally, as shown in fig. 3 and 4, the array substrate provided by the present disclosure may further include a second light extraction layer 400. The second light extraction layer 400 is disposed on a side of the first light extraction layer 300 away from the substrate 100, or between the first light extraction layer 300 and the led layer 200; the material of the second light extraction layer 400 is a positive dispersion material. That is, the refractive index of the second light extraction layer 400 decreases as the wavelength of the light increases. The first light extraction layer 300 and the second light extraction layer 400 are compounded into a light extraction film layer of the array substrate of the present disclosure, and the second light extraction layer 400 can finely adjust the characteristics of the light extraction film layer; therefore, compared with the single first light extraction layer 300, the light extraction film layer can meet the requirements of the organic electroluminescent diodes 201 with different colors on the light extraction layer, so that the optical paths of the light rays at the light emergent peak positions of the organic electroluminescent diodes 201 with different colors are optimal or nearly optimal, the influences of metal surface plasma effect and the like are reduced, the light extraction efficiency of each organic electroluminescent device is improved, the power consumption of the array substrate is reduced, and the service life of the array substrate is prolonged. The second light extraction layer 400 may be a film layer having a uniform thickness so as to be prepared through an open mask.
Alternatively, the material of the second light extraction layer 400 has an extinction coefficient of less than 0.08 in the visible light band. In this way, the loss of light emitted from the organic electroluminescent diode 201 when passing through the second light extraction layer 400 can be reduced. Further preferably, as shown in fig. 6, the negative dispersion material of the second light extraction layer 400 has an extinction coefficient of less than 0.04 in the visible light band.
Alternatively, the material of the second light extraction layer 400 may be an organic material or an inorganic material. In one embodiment of the present disclosure, the material of the second light extraction layer 400 may be HATCN or a triphenylamine/indolocarbazole-based compound.
In one embodiment of the present disclosure, as shown in fig. 4, the second light extraction layer 400 is disposed on a side of the first light extraction layer 300 away from the base substrate 100, and a refractive index of the first light extraction layer 300 to visible light is smaller than a refractive index of the second light extraction layer 400 to visible light. Therefore, the total reflection of the light emitted by the organic electroluminescent diode 201 at the interface between the first light extraction layer 300 and the second light extraction layer 400 can be avoided, the loss of the light emitted by the organic electroluminescent diode 201 can be reduced, and the light extraction rate of the array substrate can be improved.
In another embodiment of the present disclosure, as shown in fig. 3 and 5, the second light extraction layer 400 is disposed between the first light extraction layer 300 and the light emitting diode layer 200, and the refractive index of the first light extraction layer 300 to visible light is greater than the refractive index of the second light extraction layer 400 to visible light. Thus, as shown in fig. 7, total reflection of light emitted by the organic electroluminescent diode 201 at the interface between the first light extraction layer 300 and the second light extraction layer 400 can be avoided, so that the loss of light emitted by the organic electroluminescent diode 201 is reduced, and the light extraction efficiency of the array substrate is improved.
Optionally, the thickness of the second light extraction layer 400 is a second thickness d2(ii) a The second light extraction layer 400 has a first wavelength λRHas a refractive index of the fourth refractive index n4The second light extraction layer 400 has a second wavelength λGHas a refractive index of the light of the fifth refractive index n5The second light extraction layer 400 has a third wavelength λBHas a refractive index of the light of the sixth refractive index n6。
In one embodiment of the present disclosure, the method may comprise:
n1×d1+n4×d2＞n2×d1+n5×d2＞n3×d1+n6×d2。
thus, the longer the wavelength of light, the longer the optical path length when passing through the first light extraction layer 300 and the second light extraction layer 400; the shorter the wavelength of the light, the smaller the optical path length when passing through the first light extraction layer 300 and the second light extraction layer 400. Therefore, the first light extraction layer 300 and the second light extraction layer 400 can optimize the light extraction of the organic electroluminescent diodes 201 with different colors, so that the light extraction efficiency of the different organic electroluminescent diodes 201 of the array substrate is optimized, and the overall light extraction efficiency of the array substrate is improved.
In another embodiment of the present disclosure, in order to achieve a better optimization effect on the light extraction efficiency of each organic electroluminescent diode 201, the following steps may be performed:
(λR/2)×m1-0.2×λR≤LR+n1×d1+n4×d2≤(λR/2)×m1+0.2×λR；
(λG/2)×m2-0.2×λG≤LG+n2×d1+n5×d2≤(λG/2)×m2+0.2×λG；
(λB/2)×m3-0.2×λB≤LB+n3×d1+n6×d2≤(λB/2)×m3+0.2×λB；
wherein m is1、m2、m3Are all positive integers.
Wherein, the emitting angle of the red organic electroluminescent diode 201 is 0 degree and the wavelength is the first wavelength lambdaRThe total optical length of the light in the red organic electroluminescent diode 201, the first light extraction layer 300 and the second light extraction layer 400 is LR+n1×d1+n4×d2Total optical path length and lambdaRThe integral multiple of/2 is very close, and according to the principle of an optical resonant cavity, the light can be more efficiently emitted from the red organic electroluminescent diode 201, the first light extraction layer 300 and the second light extraction layer 400, so that the emission efficiency of the red light in the array substrate is improved.
Wherein the green organic electroluminescent diode 201 emits light with an emission angle of 0 ° and a wavelength of a second wavelength λGIn the green organic electroluminescent diode 201, the first light extraction layer 300 and the second lightThe total optical length in the extraction layer 400 is LG+n2×d1+n5×d2Total optical path length and lambdaGThe integral multiple of/2 is very close, and according to the principle of an optical resonant cavity, the light can be more efficiently emitted from the green organic electroluminescent diode 201, the first light extraction layer 300 and the second light extraction layer 400, so that the emission efficiency of the green light in the array substrate is improved.
Wherein the blue organic electroluminescent diode 201 emits light with an emission angle of 0 ° and a wavelength of a third wavelength λBThe total optical length of the light rays in the blue organic electroluminescent diode 201, the first light extraction layer 300 and the second light extraction layer 400 is LB+n3×d1+n6×d2Total optical path length and lambdaBThe integral multiple of/2 is very close, and according to the principle of an optical resonant cavity, the light can be more efficiently emitted from the blue organic electroluminescent diode 201, the first light extraction layer 300 and the second light extraction layer 400, so that the emission efficiency of the blue light in the array substrate is improved.
Preferably (λ)R/2)×m1-0.1×λR≤LR+n1×d1+n4×d2≤(λR/2)×m1+0.1 ×λR. Further preferably, (λ)R/2)×m1-0.05×λR≤LR+n1×d1+n4×d2≤(λR/2) ×m1+0.05×λR。
Preferably (λ)G/2)×m2-0.1×λG≤LG+n2×d1+n5×d2≤(λG/2)×m2+0.1 ×λG. Further preferably, (λ)G/2)×m2-0.05×λG≤LG+n2×d1+n5×d2≤(λG/2) ×m2+0.05×λG。
Preferably (λ)B/2)×m3-0.1×λB≤LB+n3×d1+n6×d2≤(λB/2)×m3+0.1 ×λB. Further preferably, (λ)B/2)×m3-0.05×λB≤LB+n3×d1+n6×d2≤(λB/2) ×m3+0.05×λB。
Optionally, as shown in fig. 2 to 5, the array substrate may further include a pixel defining layer 210, and the pixel defining layer 210 is located between the substrate 100 and the first light extraction layer 300 and is used for defining the position and the light emitting area of each organic electroluminescent diode 201. Preferably, the pixel defining layer 210 is located on a side of the pixel electrode layer away from the substrate base plate 100, and is provided with a plurality of pixel windows disposed in one-to-one correspondence with the plurality of first electrodes; any pixel window exposes a portion of the corresponding first pixel electrode, so that the pixel defining layer 210 can define the contact area of the first electrode and the functional layer, and further define the light emitting area of the organic electroluminescent diode 201.
Alternatively, the functional layer may be formed by an evaporation process, an inkjet printing process, or a hybrid process of the two. For example, in one embodiment of the present disclosure, the organic light emitting layer and the auxiliary film layer of each organic electrode light emitting diode may be formed by an inkjet printing method, so that the thicknesses of the organic light emitting layer and the auxiliary film layer of different organic electrode light emitting diodes may be separately controlled, which facilitates further optimization of the light extraction efficiency of each organic electrode light emitting diode.
Optionally, as shown in fig. 2 to 5, the array substrate may further include an encapsulation layer 500, and the encapsulation layer 500 may be disposed on a side of the first light extraction layer 300 away from the substrate 100. It is understood that when the array substrate includes the first light extraction layer 300 and the second light extraction layer 400, the encapsulation layer 500 may be disposed on a side of the first light extraction layer 300 and the second light extraction layer 400 away from the substrate 100.
Optionally, the array substrate may further include a driving circuit layer, which may be disposed between the light emitting diode layer 200 and the substrate 100, and is used to drive each organic electroluminescent diode 201 to emit light.
Embodiments of the present disclosure also provide a display device including any one of the array substrates described in the above array substrate embodiments. The display device may be a television, a computer screen, a cell phone screen, a watch screen, an electronic painted screen, or other type of display device. Since the display device has any one of the array substrates described in the above embodiments of the array substrate, the display device has the same advantageous effects, and the details of the disclosure are not repeated herein.
It is to be understood that the disclosure is not limited in its application to the details of construction and the arrangements of the components set forth in the specification. The present disclosure is capable of other embodiments and of being practiced and carried out in various ways. The foregoing variations and modifications are within the scope of the present disclosure. It should be understood that the disclosure disclosed and defined in this specification extends to all alternative combinations of two or more of the individual features mentioned or evident from the text and/or drawings. All of these different combinations constitute various alternative aspects of the present disclosure. The embodiments of this specification illustrate the best mode known for carrying out the disclosure and will enable those skilled in the art to utilize the disclosure.
Claims (10)
1. An array substrate, comprising:
a substrate base plate;
the light-emitting diode layer is arranged on one side of the substrate and comprises a plurality of organic light-emitting diodes for emitting light rays with different colors;
the first light extraction layer is arranged on one side, far away from the substrate, of the light-emitting diode layer; the material of the first light extraction layer is a negative dispersion material in a visible light waveband.
2. The array substrate of claim 1, wherein the first light extraction layer is made of a material having an extinction coefficient of less than 0.08 in the visible light band.
3. The array substrate of claim 1, wherein the negative dispersion material comprises one or more of PbSe, PbS, ZnS, ZnSe, PbTe.
4. The array substrate of claim 1, wherein the first light extraction layer has a first thickness d1(ii) a The organic electroluminescent diode comprises a red organic electroluminescent diode for emitting red light, a green organic electroluminescent diode for emitting green light and a blue organic electroluminescent diode for emitting blue light;
the wavelength of the light-emitting peak of the red organic electroluminescent diode is a first wavelength lambdaR(ii) a The wavelength of the light-emitting peak of the green organic electroluminescent diode is a second wavelength lambdaG(ii) a The wavelength of the light-emitting peak of the blue organic electroluminescent diode is a third wavelength lambdaB；
The first light extraction layer has a wavelength of the first wavelength λRHas a refractive index of the light of the first refractive index n1The first light extraction layer has a wavelength of the second wavelength λGHas a refractive index of the light of the second refractive index n2The first light extraction layer has a wavelength of the third wavelength λBHas a refractive index of the third refractive index n3；
The emergent angle of the red organic electroluminescent diode is 0 degree and the wavelength is the first wavelength lambdaRThe optical path in the red organic electroluminescent diode is a first light-emitting optical path LR；
The emergent angle of the green organic electroluminescent diode is 0 degree and the wavelength is the second wavelength lambdaGThe optical path in the green organic electroluminescent diode is a second light-emitting optical path LG；
The emergent angle of the blue organic electroluminescent diode is 0 degree and the wavelength is the third wavelength lambdaBThe optical path in the blue organic electroluminescent diode is a third light-emitting optical path LB；
(λR/2)×m1-0.2×λR≤LR+n1×d1≤(λR/2)×m1+0.2×λR；
(λG/2)×m2-0.2×λG≤LG+n2×d1≤(λG/2)×m2+0.2×λG；
(λB/2)×m3-0.2×λB≤LB+n3×d1≤(λB/2)×m3+0.2×λB；
Wherein m is1、m2、m3Are all positive integers.
5. The array substrate of claim 1, further comprising:
the second light extraction layer is arranged on one side, away from the substrate base plate, of the first light extraction layer or between the first light extraction layer and the light-emitting diode layer; the material of the second light extraction layer is a positive dispersion material.
6. The array substrate of claim 5, wherein a second light extraction layer is disposed on a side of the first light extraction layer away from the substrate, and the first light extraction layer has a refractive index for visible light that is less than a refractive index for visible light of the second light extraction layer;
or the second light extraction layer is arranged between the first light extraction layer and the light-emitting diode layer, and the refractive index of the first light extraction layer to visible light is larger than that of the second light extraction layer to visible light.
7. The array substrate of claim 5, wherein the second light extraction layer is made of a material having an extinction coefficient of less than 0.08 in the visible light band.
8. The array substrate of claim 5, wherein the first light extraction layer has a first thickness d1(ii) a The second lightThe thickness of the extraction layer is a second thickness d2；
The organic electroluminescent diode comprises a red organic electroluminescent diode for emitting red light, a green organic electroluminescent diode for emitting green light and a blue organic electroluminescent diode for emitting blue light;
the wavelength of the light-emitting peak of the red organic electroluminescent diode is a first wavelength lambdaR(ii) a The wavelength of the light-emitting peak of the green organic electroluminescent diode is a second wavelength lambdaG(ii) a The wavelength of the light-emitting peak of the blue organic electroluminescent diode is a third wavelength lambdaB；
The first light extraction layer has a wavelength of the first wavelength λRHas a refractive index of the light of the first refractive index n1The first light extraction layer has a wavelength of the second wavelength λGHas a refractive index of the light of the second refractive index n2The first light extraction layer has a wavelength of the third wavelength λBHas a refractive index of the third refractive index n3；
The second light extraction layer has a wavelength of the first wavelength λRHas a refractive index of the fourth refractive index n4The second light extraction layer has a wavelength of λ corresponding to the second wavelengthGHas a refractive index of the light of the fifth refractive index n5The second light extraction layer has a wavelength of the third wavelength λBHas a refractive index of the light of the sixth refractive index n6；
The emergent angle of the red organic electroluminescent diode is 0 degree and the wavelength is the first wavelength lambdaRThe optical path in the red organic electroluminescent diode is a first light-emitting optical path LR；
The emergent angle of the green organic electroluminescent diode is 0 degree and the wavelength is the second wavelength lambdaGThe optical path in the green organic electroluminescent diode is a second light-emitting optical path LG；
The emergent angle of the blue organic electroluminescent diode is 0 degree and the wavelength is the third wavelength lambdaBThe optical path in the blue organic electroluminescent diode is a third light-emitting optical path LB；
Wherein (lambda)R/2)×m1-0.2×λR≤LR+n1×d1+n4×d2≤(λR/2)×m1+0.2×λR；
(λG/2)×m2-0.2×λG≤LG+n2×d1+n5×d2≤(λG/2)×m2+0.2×λG；
(λB/2)×m3-0.2×λB≤LB+n3×d1+n6×d2≤(λB/2)×m3+0.2×λB；
Wherein m is1、m2、m3Are all positive integers.
9. The array substrate of claim 5, wherein the first light extraction layer has a first thickness d1(ii) a The thickness of the second light extraction layer is a second thickness d2；
The organic electroluminescent diode comprises a red organic electroluminescent diode for emitting red light, a green organic electroluminescent diode for emitting green light and a blue organic electroluminescent diode for emitting blue light;
the wavelength of the light-emitting peak of the red organic electroluminescent diode is a first wavelength lambdaR(ii) a The wavelength of the light-emitting peak of the green organic electroluminescent diode is a second wavelength lambdaG(ii) a The wavelength of the light-emitting peak of the blue organic electroluminescent diode is a third wavelength lambdaB；
The first light extraction layer has a wavelength of the first wavelength λRHas a refractive index of the light of the first refractive index n1The first light extraction layer has a wavelength of the second wavelength λGHas a refractive index of the light of the second refractive index n2The first light extraction layer has the third wavelengthWavelength lambdaBHas a refractive index of the third refractive index n3；
The second light extraction layer has a wavelength of the first wavelength λRHas a refractive index of the fourth refractive index n4The second light extraction layer has a wavelength of λ corresponding to the second wavelengthGHas a refractive index of the light of the fifth refractive index n5The second light extraction layer has a wavelength of the third wavelength λBHas a refractive index of the light of the sixth refractive index n6；
Wherein n is1×d1+n4×d2＞n2×d1+n5×d2＞n3×d1+n6×d2。
10. A display device comprising the array substrate according to any one of claims 1 to 9.
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