CN108807493B

CN108807493B - Organic light emitting display device, method of manufacturing the same, and organic light emitting display apparatus

Info

Publication number: CN108807493B
Application number: CN201810715844.2A
Authority: CN
Inventors: 程爽; 滨田; 牛晶华; 王湘成
Original assignee: Tianma Microelectronics Co Ltd; Shanghai Tianma AM OLED Co Ltd
Current assignee: Tianma Microelectronics Co Ltd; Wuhan Tianma Microelectronics Co Ltd
Priority date: 2016-12-13
Filing date: 2016-12-13
Publication date: 2020-09-22
Anticipated expiration: 2036-12-13
Also published as: CN108807493A; CN106531896A; CN106531896B

Abstract

An embodiment of the invention discloses an organic light emitting display device, a method of manufacturing the same, and an organic light emitting display apparatus, the organic light emitting display device including: the light-emitting device comprises a first electrode, an optical compensation layer, a light-emitting layer and a second electrode. In the embodiment of the invention, the material characteristic parameters of the optical compensation area corresponding to any one of the pixel areas with different light-emitting colors meet the limiting conditions, and the light-emitting center position of the light-emitting area corresponding to the pixel area with the light-emitting color can be controlled, so that the effect of improving the visual angle color cast of the pixel area with the light-emitting color is achieved.

Description

Organic light emitting display device, method of manufacturing the same, and organic light emitting display apparatus

Technical Field

Embodiments of the present invention relate to display technologies, and in particular, to an organic light emitting display device, a method of manufacturing the same, and an organic light emitting display apparatus.

Background

The microcavity structure is formed between the positive electrode and the negative electrode of the top-emission organic light-emitting display device, and has microcavity effect, such as light intensity increasing effect at the emission wavelength of the microcavity structure, namely the light-emitting center, narrowing effect on the emission peak spectrum, change of the emission peak wavelength, adjustment of the emission peak wavelength, intensity and half-height width of the emission peak, namely the microcavity effect of the top-emission organic light-emitting display device can improve color purity, light-emitting efficiency and light-emitting intensity. And the length of the microcavity is an important parameter of the microcavity structure, so that the length of the microcavity is an important factor influencing the microcavity effect of the top-emission organic light-emitting display device.

Based on different intrinsic emission wavelengths of different light emitting colors, the lengths of the microcavities corresponding to different light emitting colors in the top emission organic light emitting display device are different, so that the different light emitting colors of the top emission organic light emitting display device can achieve similar microcavity effects such as color purity, light emitting efficiency and light emitting intensity. Specifically, the intrinsic emission wavelength of the red light is longer than the intrinsic emission wavelength of the green light, and the intrinsic emission wavelength of the green light is longer than the intrinsic emission wavelength of the blue light, so that the microcavity length corresponding to the red light is usually longer than the microcavity lengths corresponding to the green light and the blue light.

However, when the microcavity length is long, the microcavity effect affects the device to easily generate a large viewing angle color shift, and the viewing angle color shift of the conventional organic light emitting display device at a viewing angle of 60 ° exceeds 0.06.

Disclosure of Invention

The embodiment of the invention provides an organic light-emitting display device, a manufacturing method thereof and an organic light-emitting display device, and aims to solve the problem that the existing organic light-emitting display device is large in visual angle and color.

In a first aspect, embodiments of the present invention provide an organic light emitting display device, including:

the light-emitting layer comprises a plurality of light-emitting areas, the light-emitting areas correspond to a plurality of pixel areas respectively, and the pixel areas comprise at least one of a red pixel area, a green pixel area and a blue pixel area;

an optical compensation layer disposed between the first electrode and the light emitting layer and in direct contact with the light emitting layer, the optical compensation layer including a plurality of optical compensation regions respectively disposed corresponding to the plurality of pixel regions,

the mobility mu of the first optical compensation region corresponding to the red pixel region_CRHOMO energy level HOMO_CRAnd LUMO energy level LUMO_CRSatisfies the following condition:

9*10^-5cm²/V·s≤μ_CR≤1*10^-3cm²/V·s，4.8eV≤HOMO_CR≤5.8eV，1.0eV≤LUMO_CR≤2.4eV；

the green pixel regionMobility mu of the corresponding second optical compensation region_CGHOMO energy level HOMO_CGAnd LUMO energy level LUMO_CGSatisfies the following condition:

6*10^-5cm²/V·s≤μ_CG≤5*10^-4cm²/V·s，4.5eV≤HOMO_CG≤5.7eV，1.25eV≤LUMO_CG≤2.65eV；

the mobility mu of the third optical compensation region corresponding to the blue pixel region_CBHOMO energy level HOMO_CBAnd LUMO energy level LUMO_CBSatisfies the following condition:

1*10^-5cm²/V·s≤μ_CB≤5*10^-4cm²/V·s，5.4eV≤HOMO_CB≤6.1eV，1.8eV≤LUMO_CB≤2.4eV。

in a second aspect, embodiments of the present invention further provide a method for manufacturing an organic light emitting display device, which is applied to the organic light emitting display device described above, and the method includes:

forming a first electrode;

forming a light emitting layer on the first electrode, wherein the light emitting layer includes a plurality of light emitting regions corresponding to a plurality of pixel regions including at least one of a red pixel region, a green pixel region, and a blue pixel region, respectively;

forming a second electrode on the light emitting layer;

further comprising: forming an optical compensation layer before forming the light emitting layer, wherein the optical compensation layer includes a plurality of optical compensation regions respectively disposed corresponding to the plurality of pixel regions,

the mobility mu of the second optical compensation area corresponding to the green pixel area_CGHOMO energy level HOMO_CGAnd LUMO energy level LUMO_CGSatisfies the following condition:

in a third aspect, embodiments of the present invention also provide an organic light emitting display apparatus including the organic light emitting display device described above.

The organic light-emitting display device provided by the embodiment of the invention is provided with a plurality of pixel regions, wherein the pixel regions comprise at least one of an R pixel region, a G pixel region and a B pixel region; when the R pixel region corresponds to the μ of the first optical compensation region_CR、HOMO_CRAnd LUMO_CRWhen at least one parameter in the R pixel region meets the corresponding condition, the color cast of the visual angle of the R pixel region in the organic light-emitting display device can be reduced; when the G pixel region corresponds to the μ of the second optical compensation region_CG、HOMO_CGAnd LUMO_CGWhen at least one parameter in the organic light emitting display device meets the corresponding condition, the color cast of the visual angle of a G pixel area in the organic light emitting display device can be reduced; when the second pixel region corresponds to the third optical compensation region_CB、HOMO_CBAnd LUMO_CBWhen at least one of the parameters satisfies the corresponding condition, the color shift of the viewing angle of the B pixel area in the organic light-emitting display device can be reduced.Obviously, in the embodiment of the present invention, the material characteristic parameter of the optical compensation region corresponding to any one of the pixel regions with different emission colors meets the limitation condition, and the emission center position of the emission region corresponding to the pixel region with the emission color in the organic light emitting display device can be controlled, so as to achieve the effect of effectively improving the viewing angle color cast of the pixel region with the emission color.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1A is a schematic view of an organic light emitting display provided by an embodiment of the present invention;

FIG. 1B is a cross-sectional view taken along A-A' of FIG. 1A;

fig. 2A to 2D are schematic views of various organic light emitting display devices according to an embodiment of the present invention;

FIGS. 3A to 3C are graphs showing the variation of the luminance and the color shift of the viewing angle of the R pixel region, the G pixel region and the B pixel region at different light-emitting center positions according to the embodiment of the present invention;

fig. 4A to 4C are schematic views of various organic light emitting display devices according to another embodiment of the present invention;

fig. 5 is a schematic view of various organic light emitting display devices according to still another embodiment of the present invention;

fig. 6 is a flowchart of an organic light emitting display device according to still another embodiment of the present invention;

fig. 7A to 7D are flow charts of manufacturing an organic light emitting display device according to still another embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described through embodiments with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious 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.

Fig. 1A is a schematic view of an organic light emitting display according to an embodiment of the present invention, and fig. 1B is a cross-sectional view taken along a-a of fig. 1A. The organic light emitting display comprises a lower substrate 10 and an upper substrate 20, a TFT11 array positioned on the lower substrate 10, an anode 12, an optical compensation layer 13R corresponding to an R pixel area, an optical compensation layer 13G corresponding to a light emitting layer 14R, G pixel area, an optical compensation layer 13B corresponding to a light emitting layer 14G, B pixel area, a light emitting layer 14B, and a cathode 15. The optical compensation layer of the organic light-emitting display can be used for adjusting the length of the microcavity, so that the color cast of a visual angle is improved. The light emitting mechanism of the organic light emitting display is that, taking red light as an example, a positive voltage is applied to the anode 12 corresponding to the R pixel region and a negative voltage is applied to the cathode 15, holes generated by the anode 12 are injected into the light emitting layer 14R corresponding to the anode, and electrons generated by the cathode 15 are also injected into the corresponding light emitting layer 14R; the electrons and holes injected into the light-emitting layer 14R recombine to generate excitons, which radiatively transition to make the light-emitting layer 14R emit red light.

In order to clearly describe the technical solution of the present invention, only a partial structure of the organic light emitting display is taken as an example for description and illustration in the following embodiments.

Fig. 2A to 2D are schematic views of various organic light emitting display devices according to an embodiment of the present invention. The present embodiment provides an organic light emitting display device including: a first electrode 110, a light emitting layer 120, and a second electrode 130, which are sequentially stacked, wherein the light emitting layer 120 includes a plurality of light emitting regions, the plurality of light emitting regions respectively correspond to a plurality of pixel regions, and the plurality of pixel regions include at least one of a red pixel region R, a green pixel region G, and a blue pixel region B; an optical compensation layer 140 between the first electrode 110 and the light emitting layer 120 and in direct contact with the light emitting layer 120, the optical compensation layer 140 including a plurality of optical compensation regionsMultiple optical compensation regions respectively corresponding to the multiple pixel regions, and a first optical compensation region corresponding to the red pixel region R and having a mobility [ mu ]_CRHOMO energy level HOMO_CRAnd LUMO energy level LUMO_CRSatisfies the following condition:

mobility mu of second optical compensation region corresponding to green pixel region G_CGHOMO energy level HOMO_CGAnd LUMO energy level LUMO_CGSatisfies the following condition:

at least one of the mobility μ CB, the HOMO level HOMO CB, and the LUMO level LUMOCB of the third optical compensation region corresponding to the blue pixel region B satisfies the following condition:

the organic light emitting display device in this embodiment includes a plurality of pixel regions including at least one of an R pixel region, a G pixel region, and a B pixel region. As shown in fig. 2A and 2B, the plurality of pixel regions include pixel regions of three different light emission colors, i.e., an R pixel region, a G pixel region, and a B pixel region; as shown in fig. 2C, the plurality of pixel regions include pixel regions of two different emission colors, for example, a G pixel region and a B pixel region; as shown in fig. 2D, the plurality of pixel regions include a pixel region of a different emission color, for example, an R pixel region. It will be understood by those skilled in the art that the organic light emitting display device includes, but is not limited to, the above examples, and in other alternative embodiments, the organic light emitting display device may include an R pixel region and a B pixel region, or only a B pixel region, etc., without being particularly limited in the present invention.

In this embodiment, the optical compensation layer 140 includes a plurality of optical compensation regions, the optical compensation regions are respectively disposed corresponding to the plurality of pixel regions, the optical compensation region corresponding to the R pixel region is defined as a first optical compensation region, the optical compensation region corresponding to the G pixel region is defined as a second optical compensation region, and the optical compensation region corresponding to the B pixel region is defined as a third optical compensation region. The optical compensation layer 140 is located between the first electrode 110 and the light-emitting layer 120, and specifically, taking fig. 1B as an example, the first optical compensation region is the optical compensation layer 13R located between the light-emitting layer 14R and the anode 12 and directly contacting the light-emitting layer 14R; the second optical compensation region is an optical compensation layer 13G located between the light-emitting layer 14G and the anode 12 and directly contacting the light-emitting layer 14G; the third optical compensation region is an optical compensation layer 13B located between the light-emitting layer 14B and the anode 12 and directly contacting the light-emitting layer 14B.

The organic light emitting display device in this embodiment may be selected as a top emission organic light emitting display device. In the organic light emitting display device, a microcavity structure is formed by a structure between the first electrode 110 and the second electrode 130, that is, the optical compensation layer 140 and the light emitting layer 120 located between the first electrode 110 and the second electrode 130 together form a microcavity structure, the optical compensation layer 140 can be used as a thickness adjusting layer for adjusting the length of the microcavity, and the microcavity structure has a microcavity effect. In order to achieve similar microcavity effect for pixel regions with different emission colors, in the conventional organic light emitting display device, microcavity lengths corresponding to the pixel regions with different emission colors are different, and the microcavity length is long, which makes the device prone to generate large viewing angle color shift, in this embodiment, under the condition that carrier (electron and hole) injection of two film layers respectively adjacent to the optical compensation layer 140 and the light emitting layer 120 is balanced, the viewing angle color shift of the corresponding light emitting color pixel region is improved by adjusting material characteristic parameters of the optical compensation region corresponding to the pixel region with different emission colors. Specifically, in the present embodiment, the mobility μ of the optically compensated region is adjusted_CHOMO energy level HOMO_CAnd LUMO energy level LUMO_CThe balance of carriers is controlled by at least one material characteristic parameter, and the light-emitting center position of a light-emitting area corresponding to the corresponding light-emitting color pixel area is further controlled, so that the effect of improving the visual angle color cast of the light-emitting color pixel area is achieved by controlling the light-emitting center position.

Fig. 3A to 3C show the luminance and the viewing angle color shift values of the R pixel region, the G pixel region, and the B pixel region at different light-emitting center positions according to the embodiment of the invention. Specifically, fig. 3A shows the correspondence between different light-emitting center positions at a red light wavelength peak of 610nm and the light-emitting brightness and the viewing angle color shift; FIG. 3B shows the corresponding relationship between different light-emitting center positions and the light-emitting brightness and the color shift of the viewing angle when the peak value of the green light wavelength is 530 nm; fig. 3C shows the correspondence between different light emission center positions at a blue light wavelength peak of 460nm and the light emission luminance, the viewing angle color shift. The luminance refers to the luminance at the positive viewing angle (0 °), and the viewing angle color shift refers to the viewing angle color shift at the 60 ° included angle with the positive viewing angle (0 °) in the present embodiment and any of the embodiments described below; the light-emitting center position of the light-emitting layer 120 is represented by a percentage, the light-emitting center position is represented by 0% on the side of the light-emitting layer 120 facing the optical compensation layer 140, and the light-emitting center position is represented by 100% on the side of the light-emitting layer 120 facing the second electrode 130.

For convenience of description, the data corresponding to fig. 3A to 3C are shown in table 1 below, where the efficiency percentage (%) specifically refers to the ratio of the luminous efficiency at the current luminous center position to the maximum luminous efficiency of the luminous color, and the efficiency percentage (%) of the R pixel region at the 0% luminous center position is taken as an example, that is, the luminous efficiency of red light at the 0% luminous center position is 95.70% of the maximum luminous efficiency of red light.

As can be seen from fig. 3A to 3C and table 1 above, when the light-emitting center position of the R pixel region is 40% to 60%, the viewing angle color shift of the R pixel region is smaller and the efficiency percentage is larger, that is, both the viewing angle color shift and the efficiency percentage are relatively better values, the color shift of the R pixel region is smaller and the light-emitting efficiency is high, and the display effect is good; when the light-emitting center position of the G pixel region is 60% -80%, the visual angle color cast of the G pixel region is small and the efficiency percentage is large, namely the visual angle color cast and the efficiency percentage are relatively excellent numerical values, so that the G pixel region is small in color cast, high in light-emitting efficiency and good in display effect; when the light-emitting center position of the B pixel region is 70% -90%, the viewing angle color cast of the B pixel region is small and the efficiency percentage is large, namely the viewing angle color cast and the efficiency percentage are relatively excellent values, so that the color cast of the B pixel region is small, the light-emitting efficiency is high, and the display effect is good.

For the first optical compensation area corresponding to the R pixel area, the color shift of the viewing angle of the R pixel area can be improved by controlling the light-emitting center position of the light-emitting area corresponding to the R pixel area. Specifically, μ of the first optical compensation region corresponding to the R pixel region_CR、HOMO_CRAnd LUMO_CRSatisfies the following condition: 9*10^-5cm²/V·s≤μ_CR≤1*10^-3cm²/V·s，4.8eV≤HOMO_CR≤5.8eV，1.0eV≤LUMO_CRWhen the brightness is less than or equal to 2.4eV, the light-emitting center position of the light-emitting region corresponding to the R pixel region can be controlled to be 40% -60%, the maximum viewing angle color shift of the R pixel region is not more than 0.0392, and the maximum light-emitting efficiency percentage of the R pixel region can reach 98.38%. Compared with the viewing angle color shift of more than 0.06 of the existing organic light emitting display device, the present embodiment effectively reduces the viewing angle color shift of the R pixel region of the organic light emitting display device.

For the second optical compensation area corresponding to the G pixel area, the color shift of the visual angle of the G pixel area can be improved by controlling the light-emitting center position of the light-emitting area corresponding to the G pixel area. Specifically, the G pixel region corresponds to the μ of the second optical compensation region_CG、HOMO_CGAnd LUMO_CGSatisfies the following condition: 6*10^-5cm²/V·s≤μ_CG≤5*10^-4cm²/V·s，4.5eV≤HOMO_CG≤5.7eV，1.25eV≤LUMO_CGWhen the brightness is less than or equal to 2.65eV, the light-emitting center position of the light-emitting region corresponding to the G pixel region can be controlled to be 60% -80%, the color shift of the visual angle of the G pixel region is not more than 0.0325 at most, and the light-emitting efficiency percentage of the G pixel region can reach 100% at most. Compared with the viewing angle color shift of more than 0.06 of the existing organic light emitting display device, the present embodiment effectively reduces the viewing angle color shift of the G pixel region of the organic light emitting display device.

For the third optical compensation area corresponding to the B pixel area, the color shift of the viewing angle of the B pixel area can be improved by controlling the light-emitting center position of the light-emitting area corresponding to the B pixel area. Specifically, μ of the third optical compensation region corresponding to the B pixel region_CB、HOMO_CBAnd LUMO_CBSatisfies the following condition: 1*10^-5cm²/V·s≤μ_CB≤5*10^-4cm²/V·s，5.4eV≤HOMO_CB≤6.1eV，1.8eV≤LUMO_CBWhen the brightness is less than or equal to 2.4eV, the light-emitting center position of the light-emitting region corresponding to the B pixel region can be controlled to be 70% -90%, the maximum viewing angle color deviation of the B pixel region is not more than 0.0224, and the maximum light-emitting efficiency percentage of the B pixel region can reach 98.61%. Compared with the viewing angle color shift of more than 0.06 of the existing organic light emitting display device, the present embodiment effectively reduces the viewing angle color shift of the B pixel region of the organic light emitting display device.

Therefore, when at least one material characteristic parameter of the optical compensation region corresponding to the pixel region of any one light-emitting color in the organic light-emitting display device satisfies the corresponding limiting condition, the color shift of the viewing angle of the pixel region of the light-emitting color in the organic light-emitting display device can be reduced.

It should be noted that, the conventional organic light emitting display device is affected by the microcavity effect, and a large viewing angle color shift is easily generated under the condition that the microcavity length is long, wherein the viewing angle color shift is greater than 0.06. Obviously, the reduction of the microcavity length can achieve the effect of reducing viewing angle color shift, specifically, the peak wavelength can be moved by adjusting the microcavity length so as to reduce the viewing angle color shift, however, the wavelength peak of the device can be changed by adjusting the microcavity length, and the color coordinate of the device is affected, the color coordinate is used for representing the light emitting color of the device, and the light emitting color of the device can be deviated due to the change of the color coordinate. In the embodiment, the effect of reducing the viewing angle color shift is achieved by directly adjusting the mobility, the HOMO energy level and the LUMO energy level of the optical compensation layer without adjusting the microcavity length and without affecting the color coordinate of the device, so that the organic light-emitting display device provided by the embodiment of the invention can directly achieve the effect of reducing the viewing angle color shift without changing the wavelength peak value.

Illustratively, on the basis of the above technical solution, the plurality of pixel regions may include at least one of an R pixel region, a G pixel region, and a B pixel region; mobility mu of the first optical compensation region_CRHOMO energy level HOMO_CRAnd LUMO energy level LUMO_CRSatisfies the following condition: 5*10^-4cm²/V·s≤μ_CR≤1*10^-3cm²/V·s，4.8eV≤HOMO_CR≤5.8eV，1.0eV≤LUMO_CRLess than or equal to 2.4 eV; mobility mu of the second optical compensation region_CGHOMO energy level HOMO_CGAnd LUMO energy level LUMO_CGSatisfies the following condition: 1*10^-4cm²/V·s≤μ_CG≤3*10^-4cm²/V·s，4.5eV≤HOMO_CG≤5.7eV，1.25eV≤LUMO_CGLess than or equal to 2.65 eV; mobility mu of the third optical compensation region_CBHOMO energy level HOMO_CBAnd LUMO energy level LUMO_CBSatisfies the following condition: 8*10^-5cm²/V·s≤μ_CB≤1*10^-4cm²/V·s，5.4eV≤HOMO_CB≤6.1eV，1.8eV≤LUMO_CB≤2.4eV。

It should be noted that when the HOMO of the first optical compensation region is formed_CRAnd LUMO_CRAt most two of, and mu_CRWhen the parameter condition corresponding to the first optical compensation area is satisfied, the light emitting area corresponding to the R pixel area can be controlledThe light-emitting center position of the pixel region is 45% -60%, the maximum viewing angle color cast of the R pixel region is not more than 0.0388, and the maximum light-emitting efficiency percentage of the R pixel region can reach 98.28%. When HOMO of the second optical compensation region_CGAnd LUMO_CGAt most two of, and mu_CGWhen the parameter condition corresponding to the second optical compensation area is satisfied, the light-emitting center position of the light-emitting area corresponding to the G pixel area can be controlled to be 65% -75%, the maximum viewing angle color cast of the G pixel area is not more than 0.0317, and the maximum light-emitting efficiency percentage of the G pixel area can reach 99.80%. HOMO of the third optical compensation region_CBAnd LUMO_CBAt most two of, and mu_CBWhen the parameter condition corresponding to the third optical compensation area is met, the light-emitting center position of the light-emitting area corresponding to the B pixel area can be controlled to be 76% -87%, the maximum viewing angle color deviation of the B pixel area does not exceed 0.0223, and the maximum light-emitting efficiency percentage of the B pixel area can reach 98.00%. Compared with the viewing angle color shift of more than 0.06 of the existing organic light emitting display device, the present embodiment effectively reduces the viewing angle color shift of at least one of the R pixel region, the G pixel region, and the B pixel region of the organic light emitting display device.

Illustratively, on the basis of the above technical solution, the composition material of the first electrode 110 may be metal Ag or a metal Ag alloy, and the composition material of the second electrode 130 may be indium tin oxide or indium zinc oxide. It will be understood by those skilled in the art that there are many kinds of constituent materials for the first electrode and the second electrode, including but not limited to the above examples, and the constituent materials for forming the first electrode and the second electrode can be selected by the relevant practitioner according to the product requirement, and are not particularly limited in the present invention.

Illustratively, on the basis of the above technical solution, the plurality of pixel regions may include at least one of an R pixel region, a G pixel region, and a B pixel region; the light-emitting layer 120 includes a plurality of light-emitting regions corresponding to the plurality of pixel regions, respectively, and a guest material of a first light-emitting region corresponding to the R pixel region includes a phosphorescent material; the guest material of the second light-emitting region corresponding to the G pixel region comprises a phosphorescent material; the guest material of the third light-emitting region corresponding to the B pixel region includes a fluorescent material.

The guest material in the first light-emitting region and the guest material in the second light-emitting region both include a phosphorescent material, and thus have advantages of high light-emitting efficiency and long lifetime. The guest material of the third light emitting region includes a fluorescent material, which has an advantage of long lifetime. It will be understood by those skilled in the art that the guest material of the first light-emitting region and/or the second light-emitting region may also include a fluorescent material, and the guest material of the third light-emitting region may also include a phosphorescent material, and the relevant practitioner may select the guest materials of the first, second and third light-emitting regions according to the needs of the product, which is not limited in the present invention.

The first, second and third light emitting regions further comprise a host material, respectively, and those skilled in the art will understand that the triplet energy level T1 of the host material in the first light emitting region_HRGreater than its guest material triplet state energy level T1_DR(ii) a Triplet state energy level T1 of host material of second light emitting region_HGGreater than its guest material triplet state energy level T1_DG(ii) a Triplet level T1 of host material of third light emitting region_HBGreater than its guest material triplet state energy level T1_DB. The energy levels of the host material and the guest material in the light emitting region meet the above conditions, and the triplet exciton energy of the host material in the light emitting region can be transferred to the triplet exciton energy of the guest material. In addition, the host material and the guest material in the light emitting region need to satisfy: the emission spectrum of the host material and the absorption spectrum of the guest material have to overlap to some extent. In the case where the above conditions are satisfied, the light emitting region can realize electroluminescence.

Illustratively, on the basis of the above technical solution, the plurality of pixel regions of the selectable organic light emitting display device include an R pixel region, a G pixel region, and a B pixel region. The thickness of the first optical compensation region is greater than that of the second optical compensation region in this embodiment, and the thickness of the second optical compensation region is greater than that of the third optical compensation region; specifically, the thickness of the optional first optical compensation region is greater than or equal to 85nm and less than or equal to 100nm, the thickness of the second optical compensation region is greater than or equal to 40nm and less than or equal to 55nm, and the thickness of the third optical compensation region is greater than or equal to 15nm and less than or equal to 25 nm. In this embodiment, the thickness of the first light-emitting region corresponding to the R pixel region is greater than or equal to 28nm and less than or equal to 33 nm; the thickness of the second light-emitting region corresponding to the G pixel region is greater than or equal to 18nm and less than or equal to 24 nm; the thickness of the third light-emitting region corresponding to the B pixel region is greater than or equal to 18nm and less than or equal to 23 nm.

The intrinsic emission wavelength of the red light is 615-620 nm, the intrinsic emission wavelength of the green light is 530-540 nm, and the intrinsic emission wavelength of the blue light is 460-470 nm, so that the length of the microcavity corresponding to the R pixel region in the organic light-emitting display device is larger than that of the microcavity corresponding to the G pixel region, and the length of the microcavity corresponding to the G pixel region is larger than that of the microcavity corresponding to the B pixel region. In the present embodiment in which the optical compensation layer 140 and the light emitting layer 120 between the first electrode 110 and the second electrode 130 constitute a microcavity structure, a desired microcavity length can be obtained by adjusting the thickness of the optical compensation region and/or the light emitting region. It will be understood by those skilled in the art that the thickness parameters of the optically compensating region and/or the light emitting region include, but are not limited to, the above ranges, and when the organic light emitting display device includes a pixel region of any one of the light emitting colors, the thickness of the optically compensating region and/or the light emitting region may be set by the practitioner of interest according to the needs of the product.

It should be noted that when the first optical compensation region is μ_CR、HOMO_CRAnd LUMO_CRWhen the thickness of the at least one of the R pixel regions meets the parameter condition corresponding to the first optical compensation region, the light-emitting center position of the light-emitting region corresponding to the R pixel region can be controlled to be 32% -67%, the maximum viewing angle color shift of the R pixel region is not more than 0.0398, and the maximum light-emitting efficiency percentage of the R pixel region can reach 98.38%. When the second optical compensation area is mu_CG、HOMO_CGAnd LUMO_CGAnd the thickness satisfies the parameter condition corresponding to the second optical compensation region, the light emitting region corresponding to the G pixel region can be controlled to emit lightThe center position is 51% -88%, the maximum visual angle color cast of the G pixel area is not more than 0.0341, and the maximum luminous efficiency percentage of the G pixel area can reach 100%. When the third optical compensation area is mu_CB、HOMO_CBAnd LUMO_CBWhen the thickness of the second optical compensation region meets the parameter condition corresponding to the third optical compensation region, the light-emitting center position of the light-emitting region corresponding to the B pixel region can be controlled to be 59% -96%, the maximum viewing angle color shift of the B pixel region does not exceed 0.0265, and the maximum light-emitting efficiency percentage of the B pixel region can reach 99.45%. Compared with the viewing angle color shift of more than 0.06 of the existing organic light emitting display device, the present embodiment effectively reduces the viewing angle color shift of at least one of the R pixel region, the G pixel region, and the B pixel region of the organic light emitting display device.

The organic light-emitting display device provided by the embodiment of the invention is provided with a plurality of pixel regions, wherein the pixel regions comprise at least one of an R pixel region, a G pixel region and a B pixel region; when the R pixel region corresponds to the μ of the first optical compensation region_CR、HOMO_CRAnd LUMO_CRWhen at least one parameter in the R pixel region meets the corresponding condition, the color cast of the visual angle of the R pixel region in the organic light-emitting display device can be reduced; when the G pixel region corresponds to the μ of the second optical compensation region_CG、HOMO_CGAnd LUMO_CGWhen at least one parameter in the organic light emitting display device meets the corresponding condition, the color cast of the visual angle of a G pixel area in the organic light emitting display device can be reduced; when the second pixel region corresponds to the third optical compensation region_CB、HOMO_CBAnd LUMO_CBWhen at least one of the parameters satisfies the corresponding condition, the color shift of the viewing angle of the B pixel area in the organic light-emitting display device can be reduced. Obviously, in the embodiment of the present invention, the material characteristic parameter of the optical compensation region corresponding to any one of the pixel regions with different emission colors meets the limitation condition, and the emission center position of the emission region corresponding to the pixel region with the emission color in the organic light emitting display device can be controlled, so as to achieve the effect of effectively improving the viewing angle color cast of the pixel region with the emission color.

Illustratively, on the basis of the above technical solution, the optical compensation layer 140 and the light-emitting layer 120 located between the first electrode 110 and the second electrode 130 in the organic light-emitting display device according to the embodiment of the present invention together form a microcavity structure, and the microcavity structure has a microcavity effect. If the microcavity length is long, the device is prone to generate a large viewing angle color shift, and in this embodiment, under the condition that carrier (electron and hole) injection balance of two film layers respectively adjacent to the optical compensation layer 140 and the light-emitting layer 120 is achieved, the viewing angle color shift of the corresponding light-emitting color pixel region can be improved by selectively adjusting material characteristic parameters of light-emitting regions corresponding to the different light-emitting color pixel regions. Specifically, in the present embodiment, the mobility μ of the light emitting region is adjusted_EHOMO energy level HOMO_EAnd LUMO energy level LUMO_EThe light-emitting center position of a light-emitting region corresponding to the corresponding light-emitting color pixel region is controlled by at least one material characteristic parameter, so that the effect of improving the visual angle color cast of the light-emitting color pixel region is achieved by controlling the light-emitting center position.

As will be understood by those skilled in the art, in the present invention, in the case of carrier (electron and hole) injection balance of two film layers respectively adjacent to the optical compensation layer 140 and the light-emitting layer 120, the light-emitting center position of the corresponding light-emitting color pixel region can be controlled by adjusting at least one material characteristic parameter of the optical compensation region and/or the light-emitting region, so as to improve the viewing angle color shift of the corresponding light-emitting color pixel region.

The plurality of pixel regions may be selected to include at least one of an R pixel region, a G pixel region, and a B pixel region; mobility [ mu ] of first light-emitting region corresponding to R pixel region_ERHOMO energy level HOMO_ERAnd LUMO energy level LUMO_ERSatisfies the following condition: 4*10^-5cm²/V·s≤μ_ER≤9*10^-4cm²/V·s，4.9eV≤HOMO_ER≤5.3eV，2.0eV≤LUMO_ERLess than or equal to 2.4 eV; mobility mu of second light-emitting region corresponding to G pixel region_EGHOMO energy level HOMO_EGAnd LUMO energy level LUMO_EGSatisfies the following condition: 6*10^-5cm²/V·s≤μ_EG≤5*10^-4cm²/V·s，5.3eV≤HOMO_EG≤5.9eV，2.0eV≤LUMO_EGLess than or equal to 3.3 eV; mobility [ mu ] of third light-emitting region corresponding to B pixel region_EBHOMO energy level HOMO_EBAnd LUMO energy level LUMO_EBSatisfies the following condition: 1*10^-5cm²/V·s≤μ_EB≤1*10^-4cm²/V·s，5.6eV≤HOMO_EB≤6.2eV，2.5eV≤LUMO_EB≤3.0eV。

When μ of the first light-emitting region is set to_ER、HOMO_ERAnd LUMO_ERWhen at least one parameter in the first light-emitting area meets the parameter condition corresponding to the first light-emitting area, the light-emitting center position of the first light-emitting area can be controlled to be 42% -57%, the maximum viewing angle color shift of the R pixel area is not more than 0.0390, and the maximum light-emitting efficiency percentage of the R pixel area can reach 98.34%. When mu of the second light emitting region_EG、HOMO_EGAnd LUMO_EGWhen at least one parameter in the second light-emitting region meets the parameter condition corresponding to the second light-emitting region, the light-emitting center position of the second light-emitting region can be controlled to be 63% -77%, the color shift of the visual angle of the G pixel region is not more than 0.0320 at most, and the light-emitting efficiency percentage of the G pixel region can reach 99.88% at most. When mu of the third light emitting region_EB、HOMO_EBAnd LUMO_EBWhen at least one parameter in the second luminescent region meets the parameter condition corresponding to the third luminescent region, the light-emitting center position of the third luminescent region can be controlled to be 75% -82%, the maximum viewing angle color deviation of the B pixel region does not exceed 0.0222, and the maximum light-emitting efficiency percentage of the B pixel region can reach 96.97%. Compared with the viewing angle color shift of more than 0.06 of the existing organic light emitting display device, the present embodiment effectively reduces the viewing angle color shift of at least one of the R pixel region, the G pixel region, and the B pixel region of the organic light emitting display device.

The plurality of pixel regions may be selected to include at least one of a red pixel region, a green pixel region, and a blue pixel region; mobility [ mu ] of the first light-emitting region_ERHOMO energy level HOMO_ERAnd LUMO energy level LUMO_ERSatisfies the following condition: 1*10^-4cm²/V·s≤μ_ER≤9*10^-4cm²/V·s，4.9eV≤HOMO_ER≤5.3eV，2.0eV≤LUMO_ERLess than or equal to 2.4 eV; mobility mu of the second light emitting region_EGHOMO energy level HOMO_EGAnd LUMO energy level LUMO_EGSatisfies the following condition: 9*10^-5cm²/V·s≤μ_EG≤2*10^-4cm²/V·s，5.3eV≤HOMO_EG≤5.9eV，2.0eV≤LUMO_EGLess than or equal to 3.3 eV; mobility μ of the third light emitting region_EBHOMO energy level HOMO_EBAnd LUMO energy level LUMO_EBSatisfies the following condition: 5*10^-5cm²/V·s≤μ_EB≤9*10^-5cm²/V·s，5.6eV≤HOMO_EB≤6.2eV，2.5eV≤LUMO_EB≤3.0eV。

When the HOMO in the first light-emitting region is formed_ERAnd LUMO_ERAt most two of, and mu_ERWhen the parameter condition corresponding to the first light-emitting area is met, the light-emitting center position of the first light-emitting area can be controlled to be 49% -55%, the maximum viewing angle color deviation of the R pixel area is not more than 0.0386, and the maximum light-emitting efficiency percentage of the R pixel area can reach 98.20%. When HOMO of the second light emitting region_EGAnd LUMO_EGAt most two of, and mu_EGWhen the parameter condition corresponding to the second light-emitting region is met, the light-emitting center position of the second light-emitting region can be controlled to be 63% -74%, the maximum viewing angle color cast of the G pixel region is not more than 0.0320, and the maximum light-emitting efficiency percentage of the G pixel region can reach 99.88%. When HOMO of the third light-emitting region_EBAnd LUMO_EBAt most two of, and mu_EBWhen the parameter condition corresponding to the third light-emitting region is met, the light-emitting center position of the third light-emitting region can be controlled to be 70% -79%, the maximum viewing angle color deviation of the B pixel region does not exceed 0.0220, and the maximum light-emitting efficiency percentage of the B pixel region can reach 96.29%. The present embodiment is effective to reduce viewing angle color shift of the existing organic light emitting display device over 0.06The viewing angle color shift of at least one of the R, G, and B pixel regions of the organic light emitting display device is described.

The plurality of pixel regions may be selected to include at least one of a red pixel region, a green pixel region, and a blue pixel region; mobility [ mu ] of the first light-emitting region_ERHOMO energy level HOMO_ERAnd LUMO energy level LUMO_ERSatisfies the following condition: 4*10^-5cm²/V·s≤μ_ER≤9*10^-4cm²/V·s，-0.1eV≤HOMO_CR-HOMO_ER≤0.3eV，0.05eV≤LUMO_CR-LUMO_ERLess than or equal to 0.5 eV; mobility mu of the second light emitting region_EGHOMO energy level HOMO_EGAnd LUMO energy level LUMO_EGSatisfies the following condition: 6*10^-5cm²/V·s≤μ_EG≤5*10^-4cm²/V·s，-0.3eV≤HOMO_CG-HOMO_EG≤0eV，-0.1eV≤LUMO_CG-LUMO_EGLess than or equal to 0.7 eV; mobility μ of the third light emitting region_EBHOMO energy level HOMO_EBAnd LUMO energy level LUMO_EBSatisfies the following condition: 1*10^-5cm²/V·s≤μ_EB≤1*10^- ⁴cm²/V·s，-0.5eV≤HOMO_CB-HOMO_EB≤0.2eV，0.4eV≤LUMO_CB-LUMO_EB≤0.55eV。

It should be noted that, when the HOMO level difference and the LUMO level difference between the first optical compensation region and the first light emitting region corresponding to the R pixel region satisfy the parameter condition corresponding to the R pixel region, the energy level matching between the first optical compensation region and the first light emitting region in direct contact reduces the barrier of hole transition, facilitates the injection of holes into the first light emitting region, and improves the red light emitting efficiency. When the HOMO energy level difference and LUMO energy level difference of the second optical compensation region and the second light-emitting region corresponding to the G pixel region meet the parameter conditions corresponding to the G pixel region, the energy levels of the second optical compensation region and the second light-emitting region which are in direct contact are matched, so that the potential barrier of hole transition is reduced, holes can be conveniently injected into the second light-emitting region, and the green light-emitting efficiency is improved. When the HOMO energy level difference and LUMO energy level difference of the third optical compensation region and the third light-emitting region corresponding to the B pixel region meet the parameter conditions corresponding to the B pixel region, the third optical compensation region and the third light-emitting region which are in direct contact are in energy level matching, so that the potential barrier of hole transition is reduced, holes can be conveniently injected into the third light-emitting region, and the blue light-emitting efficiency is improved.

When at least one of the HOMO level and the LUMO level of the first optical compensation region and the first light emitting region satisfies the parameter condition corresponding to the R pixel region, the light emitting center position of the light emitting region corresponding to the R pixel region may be controlled to be 47% to 54%, where the maximum viewing angle color shift of the R pixel region is not more than 0.0387, and the maximum light emitting efficiency percentage of the R pixel region may be 98.23%. When at least one of the HOMO level and the LUMO level of the second optical compensation region and the second light emitting region satisfies the parameter condition corresponding to the G pixel region, the light emitting center position of the light emitting region corresponding to the G pixel region can be controlled to be 68% to 73%, at this time, the viewing angle color cast of the G pixel region is no more than 0.0312 at most, and the light emitting efficiency percentage of the G pixel region can reach 99.68% at most. When at least one of the HOMO level and the LUMO level of the third optical compensation region and the third light emitting region satisfies the parameter condition corresponding to the B pixel region, the light emitting center position of the light emitting region corresponding to the B pixel region may be controlled to be 75% to 82%, at this time, the maximum viewing angle color shift of the B pixel region is not more than 0.0222, and the maximum light emitting efficiency percentage of the B pixel region may reach 96.97%. Compared with the viewing angle color shift of more than 0.06 of the existing organic light emitting display device, the present embodiment effectively reduces the viewing angle color shift of at least one of the R pixel region, the G pixel region, and the B pixel region of the organic light emitting display device.

On the basis of any of the above embodiments, an embodiment of the present invention further provides an organic light emitting display device, and the organic light emitting display device of this embodiment is different from the organic light emitting display device described in any of the above embodiments in that the organic light emitting display device of this embodiment further includes: the first functional layer and/or the second functional layer. For convenience of description, various organic light emitting display devices of the present embodiment may be illustrated on the basis of the organic light emitting display device shown in fig. 2B, where the organic light emitting display device shown in fig. 4A further includes a first functional layer 150, or the organic light emitting display device shown in fig. 4B further includes a second functional layer 160, or the organic light emitting display device shown in fig. 4C further includes the first functional layer 150 and the second functional layer.

In this embodiment, the first functional layer 150 is located between the first electrode 110 and the optical compensation layer 140, the first functional layer 150 at least includes a hole transport layer, and the hole transport layer is in direct contact with the optical compensation layer 140, the second functional layer 160 is located between the light emitting layer 120 and the second electrode 130, and the second functional layer 160 at least includes an electron transport layer, and the electron transport layer is in direct contact with the light emitting layer 120. The first functional layer 150 serves to enhance the hole injection and transport capability of the first electrode 110 to the light emitting layer 120, and the second functional layer 160 serves to enhance the electron injection and transport capability of the second electrode 130 to the light emitting layer 120, so that it is possible to improve carrier recombination efficiency and balance the injection and transport of carriers. Specifically, the hole transport layer in the first functional layer 150 can block the exciton transition in the light emitting layer 120 to the direction of the first electrode 110, and the electron transport layer in the second functional layer 160 can block the exciton transition in the light emitting layer 120 to the direction of the second electrode 130. The hole transport layer and/or the electron transport layer can confine excitons in the light emitting layer 120, thereby improving the light emitting efficiency of the light emitting layer 120.

It will be appreciated by those skilled in the art that in other alternative embodiments the first functional layer may further comprise at least one of a hole injection layer and an electron blocking layer, and the first functional layer may further be capable of minimizing the energy barrier spanned by the hole transition, and/or in other alternative embodiments the second functional layer may further comprise at least one of an electron injection layer and a hole blocking layer, and the second functional layer may further be capable of minimizing the energy barrier spanned by the electron transition.

In the organic light emitting display device in the present embodiment, the structure between the first electrode 110 and the second electrode 130 forms a microcavity structure, and taking the organic light emitting display device shown in fig. 4C as an example, the first functional layer 150, the optical compensation layer 140, the light emitting layer 120, and the second functional layer 160 together form a microcavity structure. In this embodiment, the microcavity length corresponding to the R pixel region in the organic light emitting display device is greater than the microcavity length corresponding to the G pixel region, and the microcavity length corresponding to the G pixel region is greater than the microcavity length corresponding to the B pixel region, so that the required microcavity length can be obtained by adjusting the thicknesses of the first functional layer, the second functional layer, the optical compensation region, and/or the light emitting region.

In this embodiment, the thickness of the hole transport layer is greater than or equal to 80nm and less than or equal to 120nm, and the thickness of the electron transport layer is greater than or equal to 32nm and less than or equal to 50 nm. It will be understood by those skilled in the art that the thickness parameters of the hole transport layer and/or the electron transport layer include, but are not limited to, the above ranges, and the relevant practitioner can set the thickness of the hole transport layer and/or the electron transport layer as desired for the product.

In the organic light emitting display device provided in this embodiment, under the condition that carrier (electron and hole) injection balance is performed between two film layers respectively adjacent to the optical compensation layer 140 and the light emitting layer 120, the viewing angle color shift of the corresponding light emitting color pixel region is improved by adjusting material characteristic parameters of the optical compensation region and/or the light emitting region corresponding to the different light emitting color pixel regions, and the specific process is similar to that in any of the above embodiments, and is not described again here.

On the basis of any of the above embodiments, the optional organic light emitting display device further includes: and the first substrate is positioned on the surface of one side of the first electrode, which is far away from the light-emitting layer, and is a rigid substrate or a flexible substrate. For convenience of description, the organic light emitting display device of the present embodiment may be illustrated on the basis of the organic light emitting display device shown in fig. 4C, which includes a first substrate 170 as shown in fig. 5.

In this embodiment, the first substrate 170 may be a flexible substrate, and the corresponding organic light emitting display device is a flexible organic light emitting display device, which has characteristics of low power consumption and being bendable, and is suitable for various display devices, especially for wearable display devices. In this embodiment, the material of the flexible substrate may be polyimide or polyethylene terephthalate resin, and those skilled in the art will understand that the material of the flexible substrate includes, but is not limited to, the above materials, and any material that can be used as the flexible substrate falls within the scope of the present invention. Those skilled in the art will understand that the first substrate includes but is not limited to a flexible substrate, and in other alternative embodiments, the first substrate may also be a rigid substrate, and accordingly, a rigid organic light emitting display device is provided, and such an organic light emitting display device also has a wide application field, and will not be described and illustrated in detail herein. The related practitioner can select the first substrate material according to the product requirement.

In order to describe the performance of the organic light emitting display device provided by the embodiment of the present invention in detail, in the present embodiment, an organic light emitting display device is provided, which includes a plurality of pixel regions including at least an R pixel region as shown in fig. 2D. Specifically, in the case where carrier (electron and hole) injection is balanced in two film layers adjacent to the optical compensation layer 140 and the light-emitting layer 120, respectively, the mobility μ of the first optical compensation region corresponding to the R pixel region of the organic light-emitting display devices Q1 to Q3 is balanced_CRHOMO energy level HOMO_CRAnd LUMO energy level LUMO_CRAnd, mobility μ of the first light emitting region_ERHOMO energy level HOMO_ERAnd LUMO energy level LUMO_ERThe following conditions are satisfied: mu.s_CR＝7*10^-4cm²/V·s，μ_ER＝4*10^-4cm²/V·s，HOMO_CR-HOMO_ER＝0.2eV，LUMO_CR-LUMO_ER＝0.3eV。

In the case where carrier (electron and hole) injection balance of two film layers respectively adjacent to the optical compensation layer and the light emitting layer is balanced in the comparative example, the mobility μ of the first optical compensation region corresponding to the R pixel region of the organic light emitting display devices D1 to D3_CRHOMO energy level HOMO_CRAnd LUMO energy level LUMO_CRAnd, mobility μ of the first light emitting region_ERHOMO energy level HOMO_ERAnd LUMO energy level LUMO_ERThe following conditions are satisfied: mu.s_CR＝1*10^-4cm²/V·s，μ_ER＝9*10^-5cm²/V·s，HOMO_CR-HOMO_ER＝-0.35eV，LUMO_CR-LUMO_ER＝-0.1eV。

The organic light emitting display devices Q1 to Q3 and D1 to D3 manufactured under the above-described limited conditions were tested to yield: the color shift of the viewing angle of the light-emitting region corresponding to the R pixel region of Q1 was 0.034, the color shift of the viewing angle of the light-emitting region corresponding to the R pixel region of Q2 was 0.038, and the color shift of the viewing angle of the light-emitting region corresponding to the R pixel region of Q3 was 0.033; the viewing angle color shift of the light-emitting region corresponding to the R pixel region of D1 was 0.073, the viewing angle color shift of the light-emitting region corresponding to the R pixel region of D2 was 0.064, and the viewing angle color shift of the light-emitting region corresponding to the R pixel region of D3 was 0.062.

It is apparent that the organic light emitting display devices of the comparative examples all had viewing angle color shifts exceeding 0.06, the organic light emitting display devices of the present examples all had viewing angle color shifts below 0.04, and the organic light emitting display devices of the present examples had low viewing angle color shifts.

On the basis of the above technical solutions, still another embodiment of the present invention further provides a manufacturing method of an organic light emitting display device, the manufacturing method being applied to the organic light emitting display device according to any of the above embodiments, the manufacturing method including:

step 210, a first electrode 110 is formed on the first substrate 100 as shown in fig. 7A.

The first substrate 100 shown in this embodiment is a pre-fabricated array substrate provided with a plurality of TFTs. In this embodiment, the first substrate 100 may be a flexible substrate or a rigid substrate. In this embodiment, the first electrode 110 may be made of a metal or a metal alloy, such as a magnesium-silver alloy, a silver metal, a silver-ytterbium alloy, or a silver-rare earth metal alloy, and the first electrode 110 serves as an anode of the organic light emitting display device. It will be understood by those skilled in the art that the constituent materials of the first electrode include, but are not limited to, the above examples, and the relevant practitioner can select the constituent materials of the first electrode according to the product requirements.

Step 230, forming a light emitting layer on the first electrode 110 as shown in fig. 7C, wherein the light emitting layer includes a plurality of light emitting regions, the plurality of light emitting regions respectively correspond to a plurality of pixel regions, and the plurality of pixel regions include at least one of an R pixel region, a G pixel region, and a B pixel region. In this embodiment, the plurality of pixel regions may include an R pixel region, a G pixel region, and a B pixel region, and the light-emitting layer includes a second light-emitting region 120B corresponding to the first light-emitting region 120R, G pixel region corresponding to the R pixel region and a third light-emitting region 120G corresponding to the B pixel region.

In this embodiment, the guest material of the first light-emitting region 120R corresponding to the optional R pixel region includes a phosphorescent material, and the guest material of the second light-emitting region 120G corresponding to the G pixel region includes a phosphorescent material; the guest material of the third light emitting region 120B corresponding to the B pixel region includes a fluorescent material. The first light-emitting region 120R further includes a first host material, and the first host material may be formed by a single or multiple host materials, and the host material may be a carbazole-based compound. The composition material of the second light-emitting region 120G further includes a second host material, and the second host material may be formed by a single or multiple host materials, and the host material may be a carbazole-based compound. The composition material of the third light emitting region 120B further includes a third host material, which may be optionally formed of a single or multiple host materials, and which may be optionally an aromatic compound. When the constituent material of any one of the light-emitting regions includes a plurality of host materials, the plurality of host materials may be mixed in advance and then the mixed host material may be subjected to vapor deposition, or the plurality of host materials may be directly subjected to vapor deposition at the same time. When the composition material of any one of the light-emitting regions includes a plurality of guest materials, the mixed guest materials may be subjected to vapor deposition after being mixed in advance, or the plurality of guest materials may be directly subjected to vapor deposition at the same time.

The plurality of pixel regions of the organic light emitting display device in this embodiment includes an R pixel region, a G pixel region, and a B pixel region; the thickness of the first light-emitting region 120R corresponding to the optional R pixel region is greater than or equal to 28nm and less than or equal to 33 nm; the thickness of the second light emitting region 120G corresponding to the G pixel region is greater than or equal to 18nm and less than or equal to 24 nm; the thickness of the third light emitting region 120B corresponding to the B pixel region is greater than or equal to 18nm and less than or equal to 23 nm.

When the organic light-emitting display device includes pixel regions of a plurality of emission colors, it is necessary to sequentially and separately deposit light-emitting regions corresponding to the pixel regions of different emission colors, and for example, the first light-emitting region 120R, the second light-emitting region 120G, and the third light-emitting region 120B may be sequentially formed in the order of the R pixel region, the G pixel region, and the B pixel region.

Step 240, a second electrode 130 is formed on the light emitting layer as shown in fig. 7D.

In this embodiment, the composition material of the second electrode 130 may be ITO or IZO, and the second electrode 130 serves as a cathode of the organic light emitting display device. It will be understood by those skilled in the art that the constituent materials of the second electrode include, but are not limited to, the above examples, and the relevant practitioner can select the constituent materials of the second electrode according to the product requirements.

The manufacturing method further includes:

step 220, forming an optical compensation layer before forming the light emitting layer as shown in fig. 7B, wherein the optical compensation layer includes a plurality of optical compensation regions respectively corresponding to the plurality of pixel regions,

mobility μ of the first optical compensation region 140R corresponding to the R pixel region_CRHOMO energy level HOMO_CRAnd LUMO energy level LUMO_CRSatisfies the following condition:

mobility μ of the second optical compensation region 140G corresponding to the G pixel region_CGHOMO energy level HOMO_CGAnd LUMO energy level LUMO_CGSatisfies the following condition:

mobility μ of the third optical compensation region 140B corresponding to the B pixel region_CBHOMO energy level HOMO_CBAnd LUMO energy level LUMO_CBSatisfies the following condition:

the plurality of pixel regions of the selectable organic light emitting display device include an R pixel region, a G pixel region, and a B pixel region; the thickness of the first optical compensation region 140R is greater than or equal to 85nm and less than or equal to 100nm, the thickness of the second optical compensation region 140G is greater than or equal to 40nm and less than or equal to 55nm, and the thickness of the third optical compensation region 140B is greater than or equal to 15nm and less than or equal to 25 nm.

In the embodiment, when the organic light emitting display device includes pixel regions of a plurality of emission colors, the optical compensation regions corresponding to the pixel regions of different emission colors need to be sequentially and respectively evaporated, for example, the first optical compensation region 140R, the second optical compensation region 140G, and the third optical compensation region 140B may be sequentially formed according to the order of the R pixel region, the G pixel region, and the B pixel region. Wherein μ of the first optically compensating region 140R_CR、HOMO_CRAnd LUMO_CRSatisfies the corresponding condition, μ of the second optical compensation region 140G_CG、HOMO_CGAnd LUMO_CGSatisfies the corresponding condition, mu of the third optical compensation region 140B_CB、HOMO_CBAnd LUMO_CBSatisfies the corresponding condition. It is also optional that the material characteristic parameter of at least one of the first, second and third optically-compensatory zones satisfies its corresponding condition.

Illustratively, the plurality of pixel regions may be selected to include at least one of an R red pixel region, a G pixel region, and a B pixel region;

first light-emitting region 12 corresponding to R pixel regionMobility μ of 0R_ERHOMO energy level HOMO_ERAnd LUMO energy level LUMO_ERSatisfies the following condition:

4*10^-5cm²/V·s≤μ_ER≤9*10^-4cm²/V·s，4.9eV≤HOMO_ER≤5.3eV，2.0eV≤LUMO_ER≤2.4eV；

mobility μ of the second light emitting region 120G corresponding to the G pixel region_EGHOMO energy level HOMO_EGAnd LUMO energy level LUMO_EGSatisfies the following condition:

6*10^-5cm²/V·s≤μ_EG≤5*10^-4cm²/V·s，5.3eV≤HOMO_EG≤5.9eV，2.0eV≤LUMO_EG≤3.3eV；

mobility μ of the third light emitting region 120B corresponding to the B pixel region_EBHOMO energy level HOMO_EBAnd LUMO energy level LUMO_EBSatisfies the following condition:

1*10^-5cm²/V·s≤μ_EB≤1*10^-4cm²/V·s，5.6eV≤HOMO_EB≤6.2eV，2.5eV≤LUMO_EB≤3.0eV。

the first electrode 110, the light-emitting layer, the second electrode 130, and the optical compensation layer may be formed by thermal evaporation, electron beam deposition, molecular beam epitaxy, vapor phase epitaxy, chemical vapor deposition, or thermal resistance wire evaporation. The relevant practitioner can select the process method for manufacturing each film structure in the organic light emitting display device according to the process conditions of the product, the production equipment and the like, and the invention is not limited in particular. Those skilled in the art will appreciate that the organic light emitting display may further include an upper substrate and the like, which are not described in detail herein.

According to the organic light-emitting display device provided by the embodiment of the invention, the material characteristic parameters of the optical compensation area corresponding to any pixel area with different light-emitting colors meet the limiting conditions, the light-emitting center position of the light-emitting area corresponding to the pixel area with the light-emitting color in the organic light-emitting display device can be controlled, and the effect of effectively improving the visual angle color cast of the pixel area with the light-emitting color is achieved.

Embodiments of the present invention also provide an organic light emitting display device, including the organic light emitting display device according to any of the above embodiments. The organic light emitting display device may be a top emission structure in which light emitted from the light emitting layer is emitted through one side surface of the second electrode.

In the organic light emitting display device provided by this embodiment, the light emitting layer may be formed of a color light emitting material, for example, the first light emitting region corresponding to the R pixel region is formed of a red light emitting material, the second light emitting region corresponding to the G pixel region is formed of a green light emitting material, and the third light emitting region corresponding to the B pixel region is formed of a blue light emitting material. However, in other embodiments, the light emitting layer may be formed by a white light emitting material, and the organic light emitting display device further includes a red filter film disposed corresponding to the first light emitting region, such that white light emitted from the first light emitting region passes through the red filter film to form red light, a green filter film disposed corresponding to the second light emitting region, such that white light emitted from the second light emitting region passes through the green filter film to form green light, and a blue filter film disposed corresponding to the third light emitting region, such that white light emitted from the third light emitting region passes through the blue filter film to form blue light.

The organic light emitting display device provided by the embodiment can be applied to wearable intelligent bracelet, and also can be applied to the field of displays such as smart phones and tablet computers.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. An organic light emitting display device, comprising:

the hole mobility mu of the first optical compensation region corresponding to the red pixel region_CRHOMO energy level HOMO_CRAnd LUMO energy level LUMO_CRSatisfies the following condition:

the hole mobility mu of the second optical compensation region corresponding to the green pixel region_CGHOMO energy level HOMO_CGAnd LUMO energy level LUMO_CGSatisfies the following condition:

hole mobility mu of the third optical compensation region corresponding to the blue pixel region_CBHOMO energy level HOMO_CBAnd LUMO energy level LUMO_CBSatisfies the following condition:

1*10^-5cm²/V·s≤μ_CB≤5*10^-4cm²/V·s，5.4eV≤HOMO_CB≤6.1eV，1.8eV≤LUMO_CB≤2.4eV；

the plurality of pixel regions includes at least one of the red pixel region, the green pixel region, and the blue pixel region;

hole mobility [ mu ] of a host material of a first light-emitting region corresponding to the red pixel region_ERHOMO energy level HOMO_ERAnd LUMO energy level LUMO_ERSatisfies the following condition:

hole mobility [ mu ] of main body material of second light-emitting region corresponding to the green pixel region_EGHOMO energy level HOMO_EGAnd LUMO energy level LUMO_EGSatisfies the following condition:

hole mobility [ mu ] of host material of third light-emitting region corresponding to the blue pixel region_EBHOMO energy level HOMO_EBAnd LUMO energy level LUMO_EBSatisfies the following condition:

1*10^-5cm²/V·s≤μ_EB≤1*10^-4cm²/V·s，5.6eV≤HOMO_EB≤6.2eV，2.5eV≤LUMO_EB≤3.0eV；

hole mobility [ mu ] of the host material of the first light-emitting region_ERHOMO energy level HOMO_ERAnd LUMO energy level LUMO_ERSatisfies the following condition: 4*10^-5cm²/V·s≤μ_ER≤9*10^-4cm²/V·s，-0.1eV≤HOMO_CR-HOMO_ER≤0.3eV，0.05eV≤LUMO_CR-LUMO_ER≤0.5eV；

Hole mobility mu of the host material of the second light emitting region_EGHOMO energy level HOMO_EGAnd LUMO energy level LUMO_EGSatisfies the following condition: 6*10^-5cm²/V·s≤μ_EG≤5*10^-4cm²/V·s，-0.3eV≤HOMO_CG-HOMO_EG≤0eV，-0.1eV≤LUMO_CG-LUMO_EG≤0.7eV；

Hole mobility μ of the host material of the third light emitting region_EBHOMO energy level HOMO_EBAnd LUMO energy level LUMO_EBSatisfies the following condition: 1*10^-5cm²/V·s≤μ_EB≤1*10^-4cm²/V·s，-0.5eV≤HOMO_CB-HOMO_EB≤0.2eV，0.4eV≤LUMO_CB-LUMO_EB≤0.55eV；

Wherein the triplet level T1 of the host material of the first light-emitting region_HRGreater than its guest material triplet state energy level T1_DR(ii) a A triplet level T1 of the host material of the second light emitting region_HGGreater than its guest material triplet state energy level T1_DG(ii) a A triplet level T1 of the host material of the third light emitting region_HBGreater than its guest material triplet state energy level T1_DB。

2. The organic light-emitting display device according to claim 1, wherein the plurality of pixel regions includes at least one of the red pixel region, the green pixel region, and the blue pixel region;

hole mobility mu of the first optical compensation region_CRHOMO energy level HOMO_CRAnd LUMO energy level LUMO_CRSatisfies the following condition: 5*10^-4cm²/V·s≤μ_CR≤1*10^-3cm²/V·s，4.8eV≤HOMO_CR≤5.8eV，1.0eV≤LUMO_CR≤2.4eV；

Hole mobility mu of the second optical compensation region_CGHOMO energy level HOMO_CGAnd LUMO energy level LUMO_CGSatisfies the following condition: 1*10^-4cm²/V·s≤μ_CG≤3*10^-4cm²/V·s，4.5eV≤HOMO_CG≤5.7eV，1.25eV≤LUMO_CG≤2.65eV；

Hole mobility mu of the third optical compensation region_CBHOMO energy level HOMO_CBAnd LUMO energy level LUMO_CBSatisfies the following condition: 8*10^-5cm²/V·s≤μ_CB≤1*10^-4cm²/V·s，5.4eV≤HOMO_CB≤6.1eV，1.8eV≤LUMO_CB≤2.4eV。

3. The organic light-emitting display device according to claim 1, wherein the plurality of pixel regions include the red pixel region, the green pixel region, and the blue pixel region;

the thickness of the first optical compensation region is greater than or equal to 85nm and less than or equal to 100nm, the thickness of the second optical compensation region is greater than or equal to 40nm and less than or equal to 55nm, and the thickness of the third optical compensation region is greater than or equal to 15nm and less than or equal to 25 nm.

4. The organic light-emitting display device according to claim 1, wherein the plurality of pixel regions includes at least one of the red pixel region, the green pixel region, and the blue pixel region;

hole mobility [ mu ] of the host material of the first light-emitting region_ERHOMO energy level HOMO_ERAnd LUMO energy level LUMO_ERSatisfies the following condition: 1*10^-4cm²/V·s≤μ_ER≤9*10^-4cm²/V·s，4.9eV≤HOMO_ER≤5.3eV，2.0eV≤LUMO_ER≤2.4eV；

Hole mobility mu of the host material of the second light emitting region_EGHOMO energy level HOMO_EGAnd LUMO energy level LUMO_EGSatisfies the following condition: 9*10^-5cm²/V·s≤μ_EG≤2*10^-4cm²/V·s，5.3eV≤HOMO_EG≤5.9eV，2.0eV≤LUMO_EG≤3.3eV；

Hole mobility μ of the host material of the third light emitting region_EBHOMO energy level HOMO_EBAnd LUMO energy level LUMO_EBSatisfies the following condition: 5*10^-5cm²/V·s≤μ_EB≤9*10^-5cm²/V·s，5.6eV≤HOMO_EB≤6.2eV，2.5eV≤LUMO_EB≤3.0eV。

5. The organic light-emitting display device according to claim 1, wherein the plurality of pixel regions includes at least the red pixel region;

hole mobility mu of the first optical compensation region_CRHOMO energy level HOMO_CRAnd LUMO energy level LUMO_CRAnd a hole mobility μ of a host material of the first light-emitting region_ERHOMO energy level HOMO_ERAnd LUMO energy level LUMO_ERAt least one parameter satisfying the following condition:

μ_CR＝7*10^-4cm²/V·s，μ_ER＝4*10^-4cm²/V·s，HOMO_CR-HOMO_ER＝0.2eV，LUMO_CR-LUMO_ER＝0.3eV。

6. the organic light-emitting display device according to claim 1, wherein the plurality of pixel regions include the red pixel region, the green pixel region, and the blue pixel region;

the thickness of the first light-emitting region corresponding to the red pixel region is greater than or equal to 28nm and less than or equal to 33 nm;

the thickness of a second light-emitting region corresponding to the green pixel region is greater than or equal to 18nm and less than or equal to 24 nm;

the thickness of the third light-emitting region corresponding to the blue pixel region is greater than or equal to 18nm and less than or equal to 23 nm.

7. The organic light-emitting display device according to claim 1, wherein the plurality of pixel regions includes at least one of the red pixel region, the green pixel region, and the blue pixel region;

the guest material of the first light-emitting region corresponding to the red pixel region includes a phosphorescent material;

the guest material of the second light-emitting region corresponding to the green pixel region comprises a phosphorescent material;

the guest material of the third light-emitting region corresponding to the blue pixel region includes a fluorescent material.

8. The organic light-emitting display device according to claim 1, further comprising: a first functional layer and/or a second functional layer;

the first functional layer is located between the first electrode and the optical compensation layer, the first functional layer at least comprises a hole transport layer, the hole transport layer is in direct contact with the optical compensation layer, the second functional layer is located between the light emitting layer and the second electrode, and the second functional layer at least comprises an electron transport layer, and the electron transport layer is in direct contact with the light emitting layer.

9. The organic light-emitting display device according to claim 8, wherein the hole transport layer has a thickness of 80nm or more and 120nm or less, and the electron transport layer has a thickness of 32nm or more and 50nm or less.

10. The organic light-emitting display device according to claim 1, further comprising: the first substrate is positioned on the surface of one side, away from the light-emitting layer, of the first electrode, and the first substrate is a rigid substrate or a flexible substrate.

11. The organic light-emitting display device according to any one of claims 1 to 10, wherein the organic light-emitting display device is a top-emission organic light-emitting display device.

12. A method of manufacturing an organic light emitting display device, applied to the organic light emitting display device according to any one of claims 1 to 11, comprising:

forming a first electrode;

forming a second electrode on the light emitting layer;

Hole mobility μ of the host material of the third light emitting region_EBHOMO energy level HOMO_EBAnd LUMO energy level LUMO_EBSatisfies the following condition: 1*10^-5cm²/V·s≤μ_EB≤1*10^-4cm²/V·s，-0.5eV≤HOMO_CB-HOMO_EB≤0.2eV，0.4eV≤LUMO_CB-LUMO_EB≤0.55eV。

13. The manufacturing method according to claim 12, wherein the plurality of pixel regions include the red pixel region, the green pixel region, and the blue pixel region;

14. The manufacturing method according to claim 12, wherein the plurality of pixel regions include the red pixel region, the green pixel region, and the blue pixel region;

15. An organic light emitting display apparatus comprising the organic light emitting display device according to any one of claims 1 to 11.