CN108649132B - Organic light emitting display device - Google Patents

Organic light emitting display device Download PDF

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Publication number
CN108649132B
CN108649132B CN201810470064.6A CN201810470064A CN108649132B CN 108649132 B CN108649132 B CN 108649132B CN 201810470064 A CN201810470064 A CN 201810470064A CN 108649132 B CN108649132 B CN 108649132B
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organic light
layer
light emitting
display device
emitting diode
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CN108649132A (en
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李田田
李维维
田景文
何麟
李梦真
周小康
逄辉
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Yungu Guan Technology Co Ltd
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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/85—Arrangements for extracting light from the devices
    • H10K50/852—Arrangements for extracting light from the devices comprising a resonant cavity structure, e.g. Bragg reflector pair
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
    • H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
    • H10K50/125—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/85—Arrangements for extracting light from the devices
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/86—Arrangements for improving contrast, e.g. preventing reflection of ambient light
    • 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
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays

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  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
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  • Electroluminescent Light Sources (AREA)

Abstract

The invention belongs to the technical field of display, and particularly relates to an organic light-emitting display device. The organic light-emitting display device comprises white organic light-emitting diodes arranged in an array manner, and filter layers correspondingly arranged on light emitting surfaces of the white organic light-emitting diodes; at least the organic light emitting diode corresponding to the filter layer with the filtering wavelength being more than 492nm has a microcavity structure; an optical compensation layer is also arranged in the organic light-emitting diode corresponding to the filter layer with the filtering wavelength being more than 492 nm; the organic light-emitting display device realizes full-color display in a mode of adding a filter layer to a white organic light-emitting diode. On the basis that the organic light-emitting diode has a microcavity structure, the optical compensation layer is arranged between the second electrode layer and the filter layer to regulate and control the length of the microcavity, so that the optical path of light in the organic light-emitting display device is changed, the number of times of light interference in the microcavity is increased, the light-emitting spectrum is narrowed, the light color is purer, and the color gamut of the organic light-emitting display device is improved.

Description

Organic light emitting display device
Technical Field
The invention belongs to the technical field of display, and particularly relates to an organic light-emitting display device.
Background
Color Gamut (Color Gamut), also called Color space, is a method for encoding a Color, and also refers to the sum of colors that a display device can produce, which represents the specific situation that a Color image can represent colors, wherein the Color Gamut is of the type NTSC, sRGB, Adobe RGB, etc. In the early stages of display industry development, the color gamut of Cathode Ray Tubes (CRT) and Liquid Crystal Displays (LCD) only reached 72% NTSC (or even lower); with the development of display technology, LED tube technology has been developed from B-LED (about 72% NTSC) to GB-LED (85% NTSC), RGB-LED (95% NTSC); with the advent of organic electroluminescent devices, the color gamut increased to 100% NTSC.
Organic Light-Emitting diodes (OLEDs), which are current-type Light-Emitting devices, are increasingly used in the field of high-performance displays because of their characteristics of self-luminescence, low driving voltage, high luminous efficiency, short response time, high definition and contrast, and the like.
The approaches of the organic electroluminescent device to realize full-color display mainly include a primary color pixel juxtaposition method and a white light filter method. The white light filter method is based on the principle that the white light emitted by the WOLED passes through a color filter and then primary colors are filtered out, and because only one organic light-emitting diode is involved in the production process of the device and the LCD field in the filter technology is mature, the production cost of the organic electroluminescent device adopting the white light filter method is lower. However, due to the filtering effect of the color filter, the white light filter method affects the brightness and contrast of the device, and is not suitable for manufacturing a display with high color gamut (> 100% NTSC).
In addition, the industry also discloses a technology of introducing quantum dot photoluminescence into a device or using a narrow-spectrum luminescent material to improve the color purity of the device, but the quantum dot photoluminescence belongs to fluorescence, only singlet excitons can be utilized, the theoretical internal quantum efficiency does not exceed 25%, 75% of triplet excitons cannot be used, and the current efficiency is low; the problem of inconsistent attenuation intensity of the narrow-spectrum luminescent material functional group can occur, and the display quality is seriously influenced.
With the continuous upgrade of display technologies, people pursue more color accuracy and richness, so that the bottleneck of the prior art is broken through, the color gamut area is further increased, and the design of a high-color-gamut display device becomes the direction of future development of the display industry.
Disclosure of Invention
Therefore, the technical problem to be solved by the present invention is to overcome the problem that the display device in the prior art has a low display color gamut and cannot meet the requirements of people.
Therefore, the invention provides an organic light-emitting display device, which comprises white light organic light-emitting diodes arranged in an array manner, and filter layers correspondingly arranged on light emitting surfaces of the white light organic light-emitting diodes;
at least the organic light emitting diode corresponding to the filter layer with the filtering wavelength being more than 492nm has a microcavity structure; an optical compensation layer is further arranged in the organic light emitting diode corresponding to the filter layer with the filtering wavelength being greater than 492 nm;
the organic light emitting diode comprises a first electrode layer, a light emitting layer and a second electrode layer which are arranged in a stacked mode; the optical compensation layer is disposed between the second electrode layer and the filter layer.
Optionally, each filter layer can filter out m kinds of light with different wavelengths, and the microcavity optical length L of each organic light emitting diode and the wavelength λ of light passing through the filter layer satisfy the following relation:
Li＝niλi
wherein n is more than or equal to 2, n is a positive integer, and n corresponding to at least one wavelength is more than or equal to 3; m is more than or equal to i and more than or equal to 1, and i and m are positive integers.
Optionally, m is 3, λ1＞λ2＞λ3(ii) a And n is2＞n1，n2＞n3。
Alternatively, 577nm ≧ λ2≥492nm，n2≥3。
Alternatively, 770nm ≧ λ1≥622nm，n1≥2；492nm＞λ3≥455nm，n3≥2。
Alternatively, 577nm ≧ λ2Not less than 492nm, the thickness of the corresponding optical compensation layer is 120 nm-200 nm; 770nm ≥ lambda1Not less than 622nm, and the thickness of the optical compensation layer is 80-110 nm.
Optionally, the light emitting structures in the organic light emitting diodes are the same.
Optionally, the first electrode layer includes a total reflection layer and an anode layer stacked on each other, and the anode layer is disposed adjacent to the light emitting layer.
Optionally, the second electrode layer is a transparent conductive layer, and a semi-reflective and semi-transparent layer is further disposed between the optical compensation layer and the filter layer.
Optionally, a light extraction layer is further disposed between the semi-reflective and semi-transparent layer and the filter layer;
each organic light emitting diode also comprises at least one of a hole injection layer, a hole transport layer, an electron blocking layer, a hole blocking layer, an electron transport layer, an electron injection layer and a connecting layer.
The technical scheme of the invention has the following advantages:
1. the organic light-emitting display device comprises white organic light-emitting diodes arranged in an array manner, and filter layers correspondingly arranged on light emitting surfaces of the organic light-emitting diodes; each organic light emitting diode has a microcavity structure; an optical compensation layer is further arranged in the organic light emitting diode corresponding to the filter layer with the filtering wavelength being greater than 492 nm;
the organic light emitting diode comprises a first electrode layer, a light emitting layer and a second electrode layer which are arranged in a stacked mode; the optical compensation layer is disposed between the second electrode layer and the filter layer.
The organic light-emitting display device realizes full-color display in a mode of adding a filter layer to a white organic light-emitting diode. On the basis that the organic light-emitting diode has a microcavity structure, the optical compensation layer is arranged between the second electrode layer and the filter layer to regulate and control the length of the microcavity, so that the optical path of light in the organic light-emitting display device is changed, the number of times of light interference in the microcavity is increased, the light-emitting spectrum is narrowed, the light color is purer, and the color gamut of the organic light-emitting display device is improved.
2. According to the organic light-emitting display device provided by the invention, the microcavity optical length L of the organic light-emitting diode is n times of the corresponding light-emitting wavelength, namely, n-order microcavity effect can be realized in the white-light organic light-emitting diode with the microcavity structure, and n is a positive integer greater than or equal to 2, so that a second-order microcavity, a third-order microcavity, a fourth-order microcavity or a higher-order microcavity can be realized, the microcavity effect is enhanced, the spectrum is further narrowed, and the color gamut area is further increased.
4. An organic light emitting display device provided by the present invention, mIs 3, λ1＞λ2＞λ3That is, the filter layer in the organic light emitting display device can filter out the emergent light with three different light emitting wavelengths, and the three wavelengths have unity, such as λ1At red wavelength, λ2At green wavelength, λ3And the full-color display is realized by traditional three primary colors for blue light wavelength.
Wherein n is2＞n1，n2＞n3That is, the intensity of the microcavity effect of the white organic light emitting diode corresponding to the green light is greater than the intensity of the microcavity effect of the white organic light emitting diode corresponding to the red light and the blue light. The color coordinates of the blue light device are relatively close to those of blue light with high color gamut standard, the red light device can realize color gamut expansion through spectrum red shift, and the green light device is difficult to realize color gamut expansion like the red light device and the blue light device due to self limitation, so that the embodiment of the invention emphasizes the enhancement of the microcavity effect of the green light device so as to be matched with the high color gamuts of the red light device and the blue light device, and realize the high color gamut of the whole organic electroluminescent device.
5. According to the organic light-emitting display device provided by the invention, the light-emitting structures in all the organic light-emitting diodes are the same, namely the structures from the first electrode to the second electrode in all the organic light-emitting diodes are the same, the regulation and control of the length of the microcavity are realized only through the optical compensation layer arranged on the second electrode, the structure of the device is simple, and the product yield is high.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural view of an organic light emitting display device provided in embodiment 1 of the present invention;
description of reference numerals:
10-a substrate; 11-a package cover plate; 12-an encapsulation layer; 21-a total reflection layer; 22-an anode layer; 3-a light emitting layer; 4-a second electrode layer; 51-red optical compensation layer; 52-green optical compensation layer; 61-a red filter layer; 62-a green filter layer; 63-a blue light filter layer; 7-semi-reflecting and semi-permeable layer; 8-light extraction layer.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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.
In the description of the present invention, it should be noted that the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
This invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concept of the invention to those skilled in the art, and the present invention will only be defined by the appended claims. In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity. It will be understood that when an element such as a layer is referred to as being "formed on" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly formed on" or "directly disposed on" another element, there are no intervening elements present.
The invention provides an organic light-emitting display device, which comprises white organic light-emitting diodes arranged in an array manner, and filter layers correspondingly arranged on light emitting surfaces of the white organic light-emitting diodes;
at least the organic light emitting diode corresponding to the filter layer with the filtering wavelength being more than 492nm has a microcavity structure; an optical compensation layer is further arranged in the organic light emitting diode corresponding to the filter layer with the filtering wavelength being greater than 492 nm; by arranging the optical compensation layer, the length of the corresponding microcavity can be increased, namely the distance of light propagating in the microcavity can be increased, so that the microcavity effect is enhanced, the spectrum is narrowed, and the color gamut area is increased.
The organic light emitting diode comprises a first electrode layer, a light emitting layer and a second electrode layer which are arranged in a stacked mode; the optical compensation layer is disposed between the second electrode layer and the filter layer.
As an alternative embodiment, the filter layer can filter out light with m different wavelengths, and the microcavity optical length L of each organic light emitting diode and the wavelength λ of light passing through the filter layer satisfy the following relation:
Li＝niλi
wherein n is more than or equal to 2, n is a positive integer, and n of at least one white organic light emitting diode is more than or equal to 3; m is more than or equal to i and more than or equal to 1, and i and m are positive integers.
As an alternative embodiment, m is 3, λ1＞λ2＞λ3(ii) a And n is2＞n1，n2＞n3. That is, the filter layer in the organic light emitting display device can filter out the emergent light with three light emitting wavelengths, and the three wavelengths have unity. E.g. λ1At red wavelength, λ2At green wavelength, λ3For blue light wavelength, full color display is realized by traditional RGB three primary colors. In the same pixel unit, the number of the white organic light emitting diodes is generally three, and the three white organic light emitting diodes respectively correspond to emergent light with the three wavelengths; the number of the white organic light emitting diodes 1 may also be more than or less than three, and the arrangement and combination manner may be set according to actual requirements, which is not limited herein. The following description takes m-3 as an example.
Wherein n is2＞n1，n2＞n3That is, the intensity of the microcavity effect of the white organic light emitting diode corresponding to the green light is greater than the intensity of the microcavity effect of the white organic light emitting diode corresponding to the red light and the blue light. This is due to the color coordinates and high gamut of the blue device itselfThe color coordinates of standard blue light are relatively close, the red light device can realize the expansion of the color gamut through the red shift of the spectrum, and the green light device is difficult to realize the expansion of the color gamut like the red light device and the blue light device due to the self limitation, so the embodiment of the invention emphasizes the enhancement of the microcavity effect of the green light device to be matched with the high color gamut of the red light device and the high color gamut of the blue light device, and the high color gamut of the whole organic electroluminescent device is realized.
For example, the microcavity order of the white organic light emitting diode corresponding to the green light emitting wavelength may be set to 3 orders, and the microcavity orders of the white organic light emitting diode corresponding to the red light emitting wavelength and the white organic light emitting diode corresponding to the blue light emitting wavelength are both set to 2 orders; or the microcavity order of the white organic light emitting diode corresponding to the green light emitting wavelength may be set to 4 orders, the microcavity order of the white organic light emitting diode corresponding to the red light emitting wavelength may be set to 3 orders, and the microcavity order of the white organic light emitting diode corresponding to the blue light emitting wavelength may be set to 2 orders. The setting can be specifically carried out according to the actual requirement, and no limitation is made herein.
As an alternative, 577nm ≧ λ2≥492nm，n2Not less than 3. Namely, the microcavity order of the white organic light emitting diode corresponding to the green light wavelength is 3 orders or higher, and the color gamut area of the white organic light emitting diode is expanded by enhancing the microcavity intensity of the white organic light emitting diode corresponding to the green light wavelength.
As an alternative embodiment, 770nm ≧ λ1≥622nm，n1≥2；492nm＞λ3≥455nm，n3Not less than 2. Namely, the microcavity order of the white organic light-emitting diode corresponding to the red light wavelength is 2 orders or higher; as an alternative embodiment, 492nm > λ3≥455nm，n3And the microcavity order of the white organic light emitting diode corresponding to the blue light wavelength is 2 or higher. Thereby, a high color gamut of the entire organic light emitting display device can be achieved.
As an alternative, the microcavity lengths of the white organic light emitting diodes corresponding to the filter layers with different filter wavelengths are not all the same. The cavity length is an important factor for regulating the microcavity optical path, and the microcavity lengths of the white organic light emitting diodes corresponding to the filter layers with different filter wavelengths are not all the same, so that the microcavity lengths corresponding to the filter layers with different filter wavelengths are not all the same, that is, the microcavity orders of the microcavities are not all the same, that is, different orders of the microcavity effect can be set according to the attributes (such as wavelength, spectrum, and the like) of different emergent light, thereby achieving the optimal spectrum narrowing effect and the optimal color gamut area.
As an alternative, 577nm ≧ λ2Not less than 492nm, the thickness of the corresponding optical compensation layer is 120 nm-200 nm; 770nm ≥ lambda1Not less than 622nm, and the thickness of the optical compensation layer is 80-110 nm. The light emitting structures in the organic light emitting diodes are the same. The structure of the part from the first electrode to the second electrode in each organic light-emitting diode is the same, the regulation and control of the length of the microcavity are realized only through the optical compensation layer arranged on the second electrode, the structure of the device is simple, and the product yield is high.
As an alternative embodiment, the first electrode layer includes a total reflection layer and an anode layer, which are stacked, and the anode layer is disposed adjacent to the light emitting layer; the second electrode layer is a transparent conductive layer, and a semi-reflecting and semi-transparent layer is further arranged between the optical compensation layer and the filter layer. And according to the reflection characteristic of the reflection electrode layer and the transmission characteristic of the semi-reflection and semi-transmission layer, a micro-cavity structure is formed between the reflection electrode layer and the semi-reflection and semi-transmission layer. The microcavity optical path L specifically refers to a path traveled by light emitted from the light-emitting layer in the process of being reflected by the first electrode layer, reflected by the transflective layer, and returned to the starting position, and an equivalent path generated by reflection phase shift of the first electrode layer and the transflective layer. The propagation path is typically twice the sum of the products of the thickness of the layers through which the light passes and the corresponding refractive indices.
As an optional embodiment, a light extraction layer is further arranged between the semi-reflecting and semi-transmitting layer and the filter layer; each organic light emitting diode also comprises at least one of a hole injection layer, a hole transport layer, an electron blocking layer, a hole blocking layer, an electron transport layer, an electron injection layer and a connecting layer.
Example 1
The invention provides an organic light emitting display device, as shown in fig. 1, comprising a plurality of white organic light emitting diodes arranged in an array, and filter layers 61, 62, 63 correspondingly arranged on light emitting surfaces of the organic light emitting diodes.
Specifically, the light emitting device comprises a first electrode layer, a light emitting layer 3 and a second electrode layer which are formed on a substrate 10 (which can be a TFT array substrate formed with a driving array), wherein the first electrode layer comprises a total reflection layer 21 and an anode layer 22 which are arranged in a stacked mode, and the anode layer 22 is arranged close to the light emitting layer 3; the second electrode layer 4 is a transparent conductive layer, on which a semi-reflective and semi-transparent layer 7 and a light extraction layer 8 are further disposed, and the organic light emitting diode and the filter layers 61, 62, 63 disposed on the light surface thereof are hermetically encapsulated on the substrate 10 through the encapsulation cover plate 11 and the encapsulation layer 12.
Each filter layer can filter out m wavelengths, and the microcavity optical length L of each organic light-emitting diode and the wavelength lambda of light passing through the filter layer satisfy the following relational expression:
Li＝niλi
wherein n is more than or equal to 2, n is a positive integer, and n of at least one white organic light emitting diode is more than or equal to 3; (ii) a m is more than or equal to i and more than or equal to 1, and i and m are positive integers.
As an alternative embodiment, in this embodiment, m is 3, λ1＞λ2＞λ3(ii) a And n is2＞n1，n2＞n3. That is, the filter layer in the organic light emitting display device can filter out the emergent light with three light emitting wavelengths, and the three wavelengths have unity. In this embodiment, λ1At red wavelength, λ2At green wavelength, λ3For blue wavelengths, including the red filter layer 61, the green filter layer 62 and the blue filter layer 63, a full color display is realized by the conventional RGB three primary colors. In the same pixel unit, the number of the white organic light emitting diodes is generally three, and the three white organic light emitting diodes correspond to the emergent light with the above three wavelengths respectively.
Each organic light emitting diode has a microcavity structure; an optical compensation layer is also arranged in the organic light-emitting diode corresponding to the filter layer with the filtering wavelength being more than 492 nm; the organic light emitting diode comprises a first electrode layer, a light emitting layer 3 and a second electrode layer 4 which are arranged in a laminated manner; an optical compensation layer is arranged between the second electrode layer 4 and the filter layers 61, 62, 63. I.e., the red optical compensation layer 51 and the green optical compensation layer 52 are formed on the second electrode layer 4 corresponding to the red filter layer 61 and the green filter layer 62, respectively.
Wherein n is2＞n1，n2＞n3That is, the intensity of the microcavity effect of the white organic light emitting diode corresponding to the green light is greater than the intensity of the microcavity effect of the white organic light emitting diode corresponding to the red light and the blue light. 577nm ≥ lambda2≥492nm，n2Not less than 3. Namely, the microcavity order of the white organic light emitting diode corresponding to the green light wavelength is 3 orders or higher, and the color gamut area of the white organic light emitting diode is expanded by enhancing the microcavity intensity of the white organic light emitting diode corresponding to the green light wavelength.
770nm≥λ1≥622nm，n1≥2；492nm＞λ3≥455nm，n3Not less than 2. Namely, the microcavity order of the white organic light-emitting diode corresponding to the red light wavelength is 2 orders or higher; as an alternative embodiment, 492nm > λ3≥455nm，n3And the microcavity order of the white organic light emitting diode corresponding to the blue light wavelength is 2 or higher. Thereby, a high color gamut of the entire organic light emitting display device can be achieved.
In this embodiment, λ corresponding to the white organic light emitting diode corresponding to the red light filter1＝628nm，n1＝2，L1＝1256nm；
Lambda corresponding to white light organic light emitting diode corresponding to green light filter2＝520nm，n2＝3，L2＝1560nm；
Lambda corresponding to white light organic light emitting diode corresponding to blue light filter3＝460nm，n3＝2，L3＝920nm。
The device structure of the white organic light emitting diode corresponding to the red light wavelength in this embodiment is as follows:
Ag(120nm)/ITO(10nm)/HAT-CN(5nm)/NPB(30nm)/MADN(30nm):DAS–Ph(5％)/Bhpen(10nm):Li(2％)/HAT-CN(10nm)/NPB(30nm)/CBP(30nm):Ir(ppy)3(15％):Ir(piq)3(0.5％)/ITO(10nm)/TPD(100nm)/Ag(20)/NPB(60nm)；
in this embodiment, the device structure of the white organic light emitting diode corresponding to the green wavelength is as follows:
Ag(120nm)/ITO(10nm)/HAT-CN(5nm)/NPB(30nm)/MADN(30nm):DAS–Ph(5％)/Bhpen(10nm):Li(2％)/HAT-CN(10nm)/NPB(30nm)/CBP(30nm):Ir(ppy)3(15％):Ir(piq)3(0.5％)/ITO(10nm)/TPD(150nm)/Ag(20)/NPB(120nm)；
the device structure of the white organic light emitting diode corresponding to the blue wavelength in this embodiment is as follows:
Ag(120nm)/ITO(10nm)/HAT-CN(5nm)/NPB(30nm)/MADN(30nm):DAS–Ph(5％)/Bhpen(10nm):Li(2％)/HAT-CN(10nm)/NPB(30nm)/CBP(30nm):Ir(ppy)3(15％):Ir(piq)3(0.5％)/ITO(10nm)/Ag(20)/NPB(120nm)。
example 2
The present invention provides an organic light emitting display device having the same structure as that of embodiment 1 except that the thickness of the optical compensation layer is different.
Such as: in this embodiment, the red optical compensation layer 51 is TPD, the thickness is 80nm, and the refractive index is 1.8; the green optical compensation layer 52 was TPD with a thickness of 200nm and a refractive index of 1.8.
In this embodiment, λ corresponding to the white organic light emitting diode corresponding to the red light filter1＝628nm，n1＝2，L1＝1256nm；
Lambda corresponding to white light organic light emitting diode corresponding to green light filter2＝520nm，n2＝3，L2＝1560nm；
Lambda corresponding to white light organic light emitting diode corresponding to blue light filter3＝460nm，n3＝2，L3＝920nm。
The device structure of the white organic light emitting diode corresponding to the red light wavelength in this embodiment is as follows:
Ag(120nm)/ITO(10nm)/HAT-CN(5nm)/NPB(30nm)/MADN(30nm):DAS–Ph(5％)/Bhpen(10nm):Li(2％)/HAT-CN(10nm)/NPB(30nm)/CBP(30nm):Ir(ppy)3(15％):Ir(piq)3(0.5％)ITO(10nm)/TPD(80nm)/Ag(20)/NPB(60nm)；
in this embodiment, the device structure of the white organic light emitting diode corresponding to the green wavelength is as follows:
Ag(120nm)/ITO(10nm)/HAT-CN(5nm)/NPB(30nm)/MADN(30nm):DAS–Ph(5％)/Bhpen(10nm):Li(2％)/HAT-CN(10nm)/NPB(30nm)/CBP(30nm):Ir(ppy)3(15％):Ir(piq)3(0.5％)/ITO(10nm)/TPD(200nm)/Ag(20)/NPB(120nm)。
the device structure of the white organic light emitting diode corresponding to the blue wavelength in this embodiment is as follows:
Ag(120nm)/ITO(10nm)/HAT-CN(5nm)/NPB(30nm)/MADN(30nm):DAS–Ph(5％)/Bhpen(10nm):Li(2％)/HAT-CN(10nm)/NPB(30nm)/CBP(30nm):Ir(ppy)3(15％):Ir(piq)3(0.5％)/ITO(10nm)/Ag(20)/NPB(120nm)。
example 3
The present invention provides an organic light emitting display device having the same structure as that of embodiment 1 except that the thickness of the optical compensation layer is different.
Such as: in this embodiment, the red optical compensation layer 51 is Alq3, the thickness is 110nm, and the refractive index is 1.9; the green optical compensation layer 52 was Alq3, and had a thickness of 120nm and a refractive index of 1.9.
In this embodiment, λ corresponding to the white organic light emitting diode corresponding to the red light filter1＝628nm，n1＝2，L1＝1256nm；
Lambda corresponding to white light organic light emitting diode corresponding to green light filter2＝520nm，n2＝3，L21560nm；
Lambda corresponding to white light organic light emitting diode corresponding to blue light filter3＝460nm，n3＝2，L3＝920nm。
The device structure of the white organic light emitting diode corresponding to the red light wavelength in this embodiment is as follows:
Ag(120nm)/ITO(10nm)/HAT-CN(5nm)/NPB(30nm)/MADN(30nm):DAS–Ph(5％)/Bhpen(10nm):Li(2％)/HAT-CN(10nm)/NPB(30nm)/CBP(30nm):Ir(ppy)3(15％):Ir(piq)3(0.5％)/ITO(10nm)/TPD(110nm)/Ag(20)/NPB(60nm)；
in this embodiment, the device structure of the white organic light emitting diode corresponding to the green wavelength is as follows:
Ag(120nm)/ITO(10nm)/HAT-CN(5nm)/NPB(30nm)/MADN(30nm):DAS–Ph(5％)/Bhpen(10nm):Li(2％)/HAT-CN(10nm)/NPB(30nm)/CBP(30nm):Ir(ppy)3(15％):Ir(piq)3(0.5％)/ITO(10nm)/TPD(120nm)/Ag(20)/NPB(60nm)；
the device structure of the white organic light emitting diode corresponding to the blue light wavelength in the embodiment is Ag (120nm)/ITO (10nm)/HAT-CN (5nm)/NPB (30nm)/MADN (30nm), DAS-Ph (5%)/Bhpen (10nm), Li (2%)/HAT-CN (10nm)/NPB (30nm)/CBP (30nm), Ir (ppy)3(15％):Ir(piq)3(0.5％)/ITO(10nm)/Ag(20)/NPB(60nm)。
Example 4
This embodiment provides an organic light emitting display device having the same structure as that of embodiment 1, which is different from the organic light emitting display device provided in embodiment 1 in that: the white organic light emitting diode corresponding to the red light wavelength is not provided with an optical compensation layer.
Example 5
This embodiment provides an organic light emitting display device having the same structure as embodiment 1 except that: the red and blue organic light emitting diodes do not have a microcavity structure.
Comparative example 1
This comparative example provides an organic light emitting display device having the same structure as example 1 except that it does not include an optical compensation layer.
Comparative example 2
This comparative example provides an organic light emitting display device having the same structure as example 1 except that: the thickness of the red optical compensation layer 51 is 150 nm; the green optical compensation layer 52 has a thickness of 100 nm.
Comparative example 3
This comparative example provides an organic light emitting display device having the same structure as example 1 except that: n is1＝n2＝n3＝2。
In this embodiment, λ corresponding to the white organic light emitting diode corresponding to the red light filter1＝628nm，n1＝2，L1＝1256nm；
Lambda corresponding to white light organic light emitting diode corresponding to green light filter2＝520nm，n2＝2，L2＝1040nm；
Lambda corresponding to white light organic light emitting diode corresponding to blue light filter3＝460nm，n3＝2，L3＝920nm。
In this embodiment, the white organic light emitting diode corresponding to the red light wavelength has the following device structure;
Ag(120nm)/ITO(10nm)/HAT-CN(5nm)/NPB(30nm)/MADN(30nm):DAS–Ph(5％)/Bhpen(10nm):Li(2％)/HAT-CN(10nm)/NPB(30nm)/CBP(30nm):Ir(ppy)3(15％):Ir(piq)3(0.5％)/ITO(10nm)/TPD(100nm)/Ag(20)/NPB(60nm)；
in this embodiment, the white organic light emitting diode corresponding to the green wavelength has the following device structure;
Ag(120nm)/ITO(10nm)/HAT-CN(5nm)/NPB(30nm)/MADN(30nm):DAS–Ph(5％)/Bhpen(10nm):Li(2％)/HAT-CN(10nm)/NPB(30nm)/CBP(30nm):Ir(ppy)3(15％):Ir(piq)3(0.5％)/ITO(10nm)/TPD(80nm)/Ag(20)/NPB(60nm)
the device structure of the white organic light emitting diode corresponding to the blue wavelength in this embodiment is as follows:
Ag(120nm)/ITO(10nm)/HAT-CN(5nm)/NPB(30nm)/MADN(30nm):DAS–Ph(5％)/Bhpen(10nm):Li(2％)/HAT-CN(10nm)/NPB(30nm)/CBP(30nm):Ir(ppy)3(15％):Ir(piq)3(0.5％)/ITO(10nm)/Ag(20)/NPB(60nm)
the performance of the above devices was tested and the results are shown in the following table:
Figure BDA0001662984920000151
Figure BDA0001662984920000161
as can be seen from the data in the above table, the organic light emitting display device provided in the embodiment of the present invention changes the optical path of light in the organic light emitting display device by setting the optical compensation layer between the second electrode layer and the filter layer to adjust and control the microcavity length, and can effectively improve the color gamut of the organic light emitting display device.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims (8)

1. An organic light emitting display device comprises white organic light emitting diodes arranged in an array, and filter layers correspondingly arranged on light emitting surfaces of the white organic light emitting diodes; it is characterized in that the preparation method is characterized in that,
at least the organic light emitting diode corresponding to the filter layer with the filtering wavelength being more than 492nm has a microcavity structure; an optical compensation layer is further arranged in the organic light emitting diode corresponding to the filter layer with the filtering wavelength being greater than 492 nm;
the white organic light emitting diode comprises a first electrode layer, a light emitting layer and a second electrode layer which are arranged in a stacked mode; the optical compensation layer is arranged between the second electrode layer and the filter layer;
the filter layer filters out m kinds of light with different wavelengths, and the microcavity optical length L of each organic light-emitting diode and the wavelength lambda of light passing through the filter layer satisfy the following relational expression:
Li＝niλi
wherein n is more than or equal to 2, n is a positive integer, and n of at least one white organic light emitting diode is more than or equal to 3; m is more than or equal to i and more than or equal to 1, and i and m are positive integers;
577nm≥λ2not less than 492nm, the thickness of the corresponding optical compensation layer is 120 nm-200 nm; 770nm ≥ lambda1Not less than 622nm, and the thickness of the optical compensation layer is 80-110 nm.
2. The organic light-emitting display device of claim 1, wherein m is 3, λ1＞λ2＞λ3(ii) a And n is2＞n1，n2＞n3。
3. The organic light-emitting display device of claim 2, wherein 577nm ≧ λ2≥492nm，n2≥3。
4. The organic light emitting display device of claim 3, wherein 770nm ≧ λ1≥622nm，n1≥2；492nm＞λ3≥455nm，n3≥2。
5. The OLED of any of claims 1-4, wherein the light emitting structures in each of the white OLEDs are identical.
6. An organic light-emitting display device according to any one of claims 1 to 4, wherein the first electrode layer comprises a total reflection layer and an anode layer stacked, the anode layer being disposed adjacent to the light-emitting layer.
7. The organic light-emitting display device according to any one of claims 1 to 4, wherein the second electrode layer is a transparent conductive layer, and a semi-reflective and semi-transparent layer is further disposed between the optical compensation layer and the filter layer.
8. The organic light-emitting display device according to claim 7, wherein a light extraction layer is further provided between the transflective layer and the filter layer.
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