Organic light emitting display device, preparation method and display device

Abstract

The present invention relates to an organic light-emitting display device, a preparation method and a display device, wherein the organic light-emitting display device comprises a first electrode layer; a light-emitting layer, arranged on one side of the first electrode layer, the light-emitting layer comprises a first light-emitting area, a second light-emitting area and a third light-emitting area emitting different colors; a hole blocking layer, arranged on a side of the light-emitting layer away from the first electrode layer, the hole blocking layer comprises a first blocking area opposite to the first light-emitting area, a second blocking area opposite to the second light-emitting area and a third blocking area opposite to the third light-emitting area, the highest occupied orbital energy level of the first blocking area is higher than the highest occupied orbital energy level of the light-emitting layer in the first light-emitting area, the highest occupied orbital energy level of the second blocking area is lower than the highest occupied orbital energy level of the light-emitting layer in the second light-emitting area, and / or the highest occupied orbital energy level of the third blocking area is lower than the highest occupied orbital energy level of the light-emitting layer in the third light-emitting area. The present invention effectively avoids the problem of high and low grayscale color deviation after reliability testing.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to an organic light emitting display device, a preparation method and a display apparatus. Background Art

[0002] Organic light emitting devices, also known as organic light emitting diodes (OLEDs), have been widely used in the display field due to their simple structure, better operating temperature and response speed, and bright color contrast.

[0003] With the development of OLED display devices, more and more products have begun to pay attention to color deviation after reliability tests of lower grayscale. Since the brightness attenuation of different colors such as red, green and blue light-emitting areas after reliability tests is inconsistent, low grayscale color deviation will occur in OLED display devices after reliability tests, affecting the display effect.

[0004] Therefore, there is an urgent need for a new organic light-emitting display device, a preparation method and a display apparatus. Summary of the invention

[0005] The embodiments of the present invention provide an organic light emitting display device, a preparation method and a display apparatus. The organic light emitting display device can effectively avoid the problem of high and low grayscale color deviation after reliability testing, thereby ensuring the display effect.

[0006] On the one hand, according to an embodiment of the present invention, an organic light-emitting display device is proposed, comprising: a first electrode layer; a light-emitting layer, arranged on one side of the first electrode layer, the light-emitting layer comprising a first light-emitting area, a second light-emitting area and a third light-emitting area emitting different colors; a hole blocking layer, arranged on a side of the light-emitting layer away from the first electrode layer, the hole blocking layer comprising a first blocking area arranged opposite to the first light-emitting area, a second blocking area arranged opposite to the second light-emitting area and a third blocking area arranged opposite to the third light-emitting area; wherein the highest occupied orbital energy level of the first blocking area is higher than the highest occupied orbital energy level of the light-emitting layer in the first light-emitting area, the highest occupied orbital energy level of the second blocking area is lower than the highest occupied orbital energy level of the light-emitting layer in the second light-emitting area, and / or the highest occupied orbital energy level of the third blocking area is lower than the highest occupied orbital energy level of the light-emitting layer in the third light-emitting area.

[0007] According to one aspect of the embodiments of the present invention, the absolute value of the difference between the highest occupied orbital energy level of the first blocking region and the highest occupied orbital energy level of the light-emitting layer in the first light-emitting region is greater than or equal to 0.2 eV and less than or equal to 1 eV.

[0008] According to one aspect of the embodiments of the present invention, the absolute value of the difference between the highest occupied orbital energy level of the second blocking region and the highest occupied orbital energy level of the light-emitting layer in the second light-emitting region is greater than or equal to 0.2 eV and less than or equal to 1 eV.

[0009] According to one aspect of the embodiments of the present invention, the absolute value of the difference between the highest occupied orbital energy level of the third blocking region and the highest occupied orbital energy level of the light-emitting layer in the third light-emitting region is greater than or equal to 0.2 eV and less than or equal to 1 eV.

[0010] According to one aspect of an embodiment of the present invention, the hole blocking layer includes a first blocking layer, the first blocking layer includes a first blocking block distributed in a first blocking area, a second blocking block distributed in a second blocking area, and a third blocking block distributed in a third blocking area, and the material of the first blocking block is different from the material of the second blocking block and the third blocking block.

[0011] According to one aspect of an embodiment of the present invention, the hole blocking layer also includes a second blocking layer, which is located between the first blocking layer and the light-emitting layer and covers the first light-emitting area, the second light-emitting area and the third light-emitting area. The second blocking layer is a whole layer structure and has the same material as the first blocking layer.

[0012] According to one aspect of the embodiment of the present invention, the mobility of the first barrier region is greater than the mobility of the second barrier region and the mobility of the third barrier region.

[0013] According to one aspect of the embodiments of the present invention, the first light-emitting area is a blue light-emitting area, the first blocking area is a blue blocking area, the second light-emitting area is a red light-emitting area, the second blocking area is a red blocking area, the third light-emitting area is a green light-emitting area, and the third blocking area is a green blocking area.

[0014] According to one aspect of an embodiment of the present invention, the material of the first barrier area includes 4,7-diphenyl-1,10-phenanthroline, the second barrier area includes 1,3,5-tri(1-phenyl-1H-benzimidazol-2-yl)benzene, and the third barrier area includes 1,3,5-tri(1-phenyl-1H-benzimidazol-2-yl)benzene; or, the material of the first barrier area includes 3-(biphenyl-4-yl)-5-(4-tert-butylphenyl)-4-phenyl-4H-1,2,4-triazole, and the material of the second barrier area and the material of the third barrier area respectively include 1,4-bis(3,5-dipyridin-3-ylphenyl)benzene.

[0015] On the other hand, according to an embodiment of the present invention, a method for preparing an organic light-emitting display device is provided, comprising:

[0016] Providing a substrate having a first electrode layer, forming a light-emitting layer on one side of the first electrode layer, wherein the light-emitting layer includes a first light-emitting area, a second light-emitting area, and a third light-emitting area that emit different colors;

[0017] A hole blocking layer is formed on the light-emitting layer, the hole blocking layer comprising a first blocking region opposite to the first light-emitting region, a second blocking region opposite to the second light-emitting region, and a third blocking region opposite to the third light-emitting region, the highest occupied orbital energy level of the first blocking region is higher than the highest occupied orbital energy level of the light-emitting layer in the first light-emitting region, the highest occupied orbital energy level of the second blocking region is lower than the highest occupied orbital energy level of the light-emitting layer in the second light-emitting region, and / or the highest occupied orbital energy level of the third blocking region is lower than the highest occupied orbital energy level of the light-emitting layer in the third light-emitting region.

[0018] According to another aspect of the embodiment of the present invention, the step of forming a hole blocking layer on the first light-emitting area includes: forming a first blocking layer on the light-emitting layer, the first blocking layer including a first blocking block distributed in the first light-emitting area, a second blocking block distributed in the second light-emitting area, and a third blocking block distributed in the third light-emitting area, and the material of the first blocking block is different from the materials of the second blocking block and the third blocking block.

[0019] According to another aspect of the embodiment of the present invention, the step of forming a first blocking layer on the light-emitting layer includes:

[0020] Vapor depositing a first material on the first light emitting area to form a first blocking block;

[0021] Vapor depositing a second material on the second light emitting area to form a second blocking block;

[0022] A third material is evaporated on the third light emitting area to form a third blocking block.

[0023] According to another aspect of the embodiment of the present invention, before the step of forming a first barrier layer above the light-emitting layer, the step also includes: forming a second barrier layer on the light-emitting layer, the second barrier layer is a whole layer structure and covers the first light-emitting area, the second light-emitting area and the third light-emitting area.

[0024] In yet another aspect, a display device is provided according to an embodiment of the present invention, comprising the above-mentioned organic light emitting display device.

[0025] According to the organic light-emitting display device, preparation method and display device provided by the embodiment of the present invention, the organic light-emitting display device includes a first electrode layer, a light-emitting layer and a hole blocking layer, the first electrode layer is used to provide holes to the light-emitting layer, and the hole blocking layer includes a first blocking area arranged opposite to the first light-emitting area, a second blocking area arranged opposite to the second light-emitting area and a third blocking area arranged opposite to the third light-emitting area, and the highest occupied orbital energy level of the first blocking area is higher than the highest occupied orbital energy level of the light-emitting layer in the first light-emitting area, so that during the reliability test, the organic light-emitting display device can avoid the accumulation of holes in the light-emitting area of ​​the light-emitting layer to cause the aging of the device, thereby improving the life of the low grayscale light-emitting area such as the blue light-emitting area. The highest occupied orbital energy level of at least one of the second blocking area and the third blocking area is lower than the highest occupied orbital energy level of the light-emitting layer in the second light-emitting area or the third light-emitting area, ensuring that the recombination area of ​​electrons and holes is in the central area of ​​the light-emitting layer, so that the life attenuation trend of each light-emitting area is consistent, solving the problem of low grayscale color deviation caused by inconsistent life attenuation of light-emitting areas of different colors after the reliability test, and achieving low grayscale reliability improvement. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Features, advantages, and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

[0027] Figure 1 is a top view of an organic light emitting display device according to an embodiment of the present invention;

[0028] Figure 2 yes Figure 1 The cross-sectional view along the AA direction;

[0029] Figure 3 is a partial cross-sectional view of an organic light emitting display device according to an embodiment of the present invention;

[0030] Figure 4 is a partial cross-sectional view of an organic light emitting area display device according to another embodiment of the present invention;

[0031] Figure 5 is a schematic flow chart of a method for preparing an organic light-emitting display device according to an embodiment of the present invention;

[0032] Figure 6a to Figure 6d is a schematic structural diagram corresponding to each step of a method for preparing an organic light-emitting display device according to an embodiment of the present invention;

[0033] Figure 7 is a schematic flow chart of step S200 in a method for preparing an organic light-emitting display device according to an embodiment of the present invention;

[0034] Figure 8a to Figure 8c1 is a schematic structural diagram corresponding to each step of step S200 in a method for preparing an organic light-emitting display device according to an embodiment of the present invention;

[0035] Figure 9a to Figure 9b is a schematic structural diagram corresponding to some steps of a method for preparing an organic light-emitting display device according to another embodiment of the present invention;

[0036] Fig.10 It is a schematic structural diagram of a display device according to an embodiment of the present invention.

[0037] in:

[0038] 100-organic light emitting display device;

[0039] 10- first electrode layer;

[0040] 20-hole injection layer;

[0041] 30-hole transport layer;

[0042] 40-electron blocking layer;

[0043] 50-light-emitting layer; 51-first light-emitting area; 52-second light-emitting area; 53-third light-emitting area;

[0044] 60-hole blocking layer; 60a-first blocking area; 60b-second blocking area; 60c-third blocking area; 61-first blocking layer; 611-first blocking block; 612-second blocking block; 613-third blocking block; 62-second blocking layer;

[0045] 70-electron transport layer;

[0046] 80-electron injection layer;

[0047] 90- a second electrode layer;

[0048] 200-base.

[0049] In the drawings, the same reference numerals are used for the same components. The drawings are not drawn to scale. DETAILED DESCRIPTION

[0050] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present invention and are not configured to limit the present invention. For those skilled in the art, the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention.

[0051] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0052] It should be understood that when describing the structure of a component, when a layer or a region is referred to as being "on" or "over" another layer or another region, it may mean that it is directly on the other layer or another region, or that other layers or regions are included between it and the other layer or another region. Moreover, if the component is turned over, the layer or a region will be "below" or "beneath" another layer or another region.

[0053] With the development of organic light-emitting display screens, more and more products have begun to pay attention to the reliability test of lower grayscale. In the existing organic light-emitting display devices, the hole blocking layer is made of the same material for different light-emitting areas. Due to the differences in the properties of the light-emitting materials in the light-emitting areas of different colors, the brightness attenuation of the light-emitting areas of different colors of the organic light-emitting display devices is inconsistent after the reliability test, which leads to the low grayscale color deviation after the reliability test, affecting the display effect.

[0054] In order to solve the above technical problems, the embodiments of the present invention provide an organic light-emitting display device and a display apparatus, which can effectively avoid the problem of high and low grayscale color deviation after reliability testing and ensure the display effect. Figures 1 to 10 An organic light emitting display device, a manufacturing method and a display apparatus according to embodiments of the present invention are described in detail.

[0055] See also Figures 1 to 3 The organic light-emitting display device 100 provided in an embodiment of the present invention includes a first electrode layer 10, a hole injection layer 20, a hole transport layer 30, an electron blocking layer 40, a light-emitting layer 50, a hole blocking layer 60, an electron transport layer 70, an electron injection layer 80 and a second electrode 90 which are stacked. The first electrode layer 10 can be an anode, and the second electrode layer 90 can be a cathode.

[0056] The hole injection layer 20 and the hole transport layer 30 are used to inject and transport holes from the first electrode layer 10 to the light-emitting layer 50, and the electron injection layer 80 and the electron transport layer 70 are used to inject and transport electrons from the second electrode layer 90 to the light-emitting layer 50. The hole blocking layer 60 is used to block the passage of holes, and the electron blocking layer 40 is used to block the passage of electrons. The light-emitting layer 50 is driven by the electric field between the first electrode layer 10 and the second electrode layer 90, and emits light through the injection and recombination of carriers, i.e., electrons and holes.

[0057] The light-emitting layer 50 includes a first light-emitting area 51, a second light-emitting area 52, and a third light-emitting area 53 that emit different colors. The hole blocking layer 60 is disposed on a side of the light-emitting layer 50 away from the hole transport layer 30, and the hole blocking layer 60 includes a first blocking area 60a disposed opposite to the first light-emitting area 51, a second blocking area 60b disposed opposite to the second light-emitting area 52, and a third blocking area 60c disposed opposite to the third light-emitting area 53. The highest occupied orbital energy level of the first blocking area 60a is higher than the highest occupied orbital energy level of the light-emitting layer 50 in the first light-emitting area 51, the highest occupied orbital energy level of the second blocking area 60b is lower than the highest occupied orbital energy level of the light-emitting layer 50 in the second light-emitting area 52, and / or the highest occupied orbital energy level of the third blocking area 60c is lower than the highest occupied orbital energy level of the light-emitting layer 50 in the third light-emitting area 53.

[0058] The highest occupied molecular orbital (HOMO) refers to the molecular orbital with the highest energy among the molecular orbitals that have occupied electrons.

[0059] The highest occupied orbital energy level of the mentioned first blocking zone 60a is higher than the highest occupied orbital energy level of the light-emitting layer 50 in the first light-emitting zone 51. It can also be said that the highest occupied orbital energy level of the first blocking zone 60a is shallower than the highest occupied orbital energy level of the light-emitting layer 50 in the first light-emitting zone 51, or the absolute value of the highest occupied orbital energy level of the first blocking zone 60a is smaller than the absolute value of the highest occupied orbital energy level of the light-emitting layer 50 in the first light-emitting zone 51.

[0060] The highest occupied orbital energy level of the mentioned second blocking zone 60b is lower than the highest occupied orbital energy level of the light-emitting layer 50 in the second light-emitting zone 52. It can also be said that the highest occupied orbital energy level of the second blocking zone 60b is deeper than the highest occupied orbital energy level of the light-emitting layer 50 in the second light-emitting zone 52, or the absolute value of the highest occupied orbital energy level of the second blocking zone 60b is greater than the absolute value of the highest occupied orbital energy level of the light-emitting layer 50 in the second light-emitting zone 52.

[0061] The highest occupied orbital energy level of the third blocking zone 60c mentioned is lower than the highest occupied orbital energy level of the light-emitting layer 50 in the third light-emitting zone 53. It can also be said that the highest occupied orbital energy level of the third blocking zone 60c is deeper than the highest occupied orbital energy level of the light-emitting layer 50 in the third light-emitting zone 53, or the absolute value of the highest occupied orbital energy level of the third blocking zone 60c is greater than the absolute value of the highest occupied orbital energy level of the light-emitting layer 50 in the third light-emitting zone 53.

[0062] Since the hole blocking layer 60 includes a first blocking region 60a arranged opposite to the first light-emitting region 51, a second blocking region 60b arranged opposite to the second light-emitting region 52, and a third blocking region 60c arranged opposite to the third light-emitting region 53, and the highest occupied orbital energy level of the first blocking region 60a is higher than the highest occupied orbital energy level of the light-emitting layer 50 in the first light-emitting region 51, the organic light-emitting display device 100 can avoid the accumulation of holes in the first light-emitting region 51 of the light-emitting layer 50 during the reliability test, reduce the oxidation damage of holes to the light-emitting material in the first light-emitting region 52, and thus effectively avoid device aging, thereby achieving the improvement of the life of the low grayscale light-emitting region such as the blue light-emitting region. The highest occupied orbital energy level of at least one of the second blocking region 60b and the third blocking region 60c is lower than the highest occupied orbital energy level of the light-emitting layer 50 in the second light-emitting region 52 or the third light-emitting region 53, ensuring that the recombination area of ​​electrons and holes is in the central area of ​​each light-emitting region, so that the life attenuation trend of each light-emitting region is consistent, solving the problem of low grayscale color deviation caused by inconsistent life attenuation of different light-emitting regions after the reliability test, and achieving low grayscale reliability improvement.

[0063] As an optional implementation, in order to better understand the organic light emitting display device 100 provided in the embodiment of the present invention, the first light emitting area 51 can be a blue light emitting area, the first blocking area 60a is a blue blocking area, the second light emitting area 52 is a red light emitting area, the second blocking area 60b is a red blocking area, the third light emitting area 53 is a green light emitting area, and the third blocking area 60c is a green blocking area. As a material limitation of the blue light emitting area, the energy difference of the blue light emitting area is relatively large compared with the red light emitting area and the green light emitting area, and the oxidation resistance is relatively weak. After the reliability test, if the holes accumulate in the blue light emitting area, the blue light emitting material will be oxidized, causing its life to be greatly reduced. By limiting the first light emitting area 51 to the blue light emitting area, the corresponding first blocking area 60a is a blue blocking area, so that the organic light emitting display device 100 can make holes accumulate in the first blocking area 60a during the reliability test, avoiding the accumulation of holes in the light emitting layer 50 to cause the aging of the device, thereby realizing a long-life blue light device, which is conducive to the consistent life attenuation trend of each light emitting area, and reducing the low grayscale color shift after the reliability test.

[0064] Optionally, the absolute value of the difference between the highest occupied orbital energy level of the first blocking region 60a and the highest occupied orbital energy level of the light-emitting layer 50 in the first light-emitting region 51 is greater than or equal to 0.2 eV. This can effectively improve the brightness attenuation of the first light-emitting region 51 after the reliability test and reduce the low grayscale color shift after the reliability test.

[0065] Optionally, the absolute value of the difference between the highest occupied orbital energy level of the second blocking region 60b and the highest occupied orbital energy level of the light-emitting layer 50 in the second light-emitting region 52 is greater than or equal to 0.2 eV. This can effectively ensure that the brightness attenuation of the second light-emitting region 52 after the reliability test is consistent with the brightness attenuation of the first light-emitting region 51, thereby reducing the low grayscale color shift after the reliability test.

[0066] Optionally, the absolute value of the difference between the highest occupied orbital energy level of the third blocking region 60c and the highest occupied orbital energy level of the light-emitting layer 50 in the third light-emitting region 53 is greater than or equal to 0.2 eV. This can effectively ensure that after the reliability test, the brightness attenuation of the third light-emitting region 53 is consistent with the brightness attenuation region of the first light-emitting region 51, thereby reducing the low grayscale color shift after the reliability test.

[0067] As an optional implementation, the absolute value of the difference between the highest occupied orbital energy level of the first blocking region 60a and the highest occupied orbital energy level of the light-emitting layer 50 in the first light-emitting region 51 is any value between 0.2eV and 1eV, including the two end values ​​of 0.2eV and 1eV.

[0068] Optionally, the absolute value of the difference between the highest occupied orbital energy level of the second blocking region 60 b and the highest occupied orbital energy level of the light-emitting layer 50 in the second light-emitting region 52 is any value between 0.2 eV and 1 eV, including 0.2 eV and 1 eV.

[0069] Optionally, the absolute value of the difference between the highest occupied orbital energy level of the third blocking region 60 c and the highest occupied orbital energy level of the light-emitting layer 50 in the third light-emitting region 53 is any value between 0.2 eV and 1 eV, including 0.2 eV and 1 eV.

[0070] Through the above-mentioned arrangement, the difference between the highest occupied orbital energy level of the first blocking area 60a, the second blocking area 60b and the third blocking area 60c and the light-emitting layer 50 can be maintained within a reasonable range, which can achieve the effect of blocking holes and at the same time avoid the destruction of the transmission balance between holes and electrons due to excessive difference. On the basis of improving the low grayscale color deviation, the performance of the organic light-emitting display device 100 can be further optimized and the service life can be improved.

[0071] In some optional embodiments, the material of the first barrier region 60a includes 4,7-diphenyl-1,10-phenanthroline, and the material of the second barrier region 60b and the material of the third barrier region 60c include 1,3,5-tri(1-phenyl-1H-benzimidazol-2-yl)benzene. Through the above arrangement, the highest occupied orbital energy level requirements of the first barrier region 60a, the second barrier region 60b and the third barrier region 60c can be reliably guaranteed.

[0072] Please continue reading Figures 1 to 3 As an optional embodiment, the hole blocking layer 60 includes a first blocking layer 61, the first blocking layer 61 includes a first blocking block 611 distributed in the first blocking area 60a, a second blocking block 612 distributed in the second blocking area 60b, and a third blocking block 613 distributed in the third blocking area 60c, and the material of the first blocking block 611 is different from the material of the second blocking block 612 and the third blocking block 613. Corresponding to the light-emitting areas of different colors, the blocking blocks made of different materials are used as the hole blocking layer 60, which is more conducive to achieving the difference requirement of the highest occupied orbital energy level corresponding to each blocking area and the light-emitting layer 50.

[0073] Optionally, the material of the first blocking block 611 may include 4,7-diphenyl-1,10-phenanthroline, the material of the second blocking block 612 may include 1,3,5-tri(1-phenyl-1H-benzimidazol-2-yl)benzene, and the material of the third blocking block 613 may include 1,3,5-tri(1-phenyl-1H-benzimidazol-2-yl)benzene.

[0074] Please also read Figure 4 As an optional implementation, in the organic light-emitting display device 100 provided in the above embodiment, the hole blocking layer 60 may further include a second blocking layer 62, which is located between the first blocking layer 61 and the light-emitting layer 50 and covers the first light-emitting area 51, the second light-emitting area 52 and the third light-emitting area 53. The second blocking layer 62 is a whole layer structure and is made of the same material as the first blocking layer 611. Through the above arrangement, the material thickness of the first blocking area 60a corresponding to the blue light-emitting area can be selectively thickened to achieve a long-life blue light device, so that after the reliability test, the life attenuation of the blue light-emitting area, the red light-emitting area and the green light-emitting area tends to be consistent, effectively solving the problem of low grayscale color shift.

[0075] In some alternative embodiments, the material of the second barrier layer 62 may include 4,7-diphenyl-1,10-phenanthroline which is the same as the material of the first barrier layer 611 .

[0076] As an optional implementation, in the organic light-emitting display device 100 provided in the embodiment of the present invention, the mobility of the first blocking area 60a is greater than the mobility of the second blocking area 60b and the mobility of the third blocking area 60c. Through the above configuration, after the reliability test, the life decay of the first light-emitting area 51, the second light-emitting area 52 and the third light-emitting area 53 of the light-emitting layer 50 can be made close to the same, thereby improving the reliability of low grayscale color shift.

[0077] As an optional implementation, the redox stability of the first barrier region 60a is better than the redox stability of the second barrier region 60b and the third barrier region 60c.

[0078] Optionally, the selection of materials for the first blocking area 60a, the second blocking area 60b and the third blocking area 60c in the above embodiment is only an optional implementation method, but is not limited to the above method. In some embodiments, the material of the first blocking area 60a can also include 3-(biphenyl-4-yl)-5-(4-tert-butylphenyl)-4-phenyl-4H-1,2,4-triazole, the material of the second blocking area 60b and the material of the third blocking area 60c can respectively include 1,4-bis(3,5-bipyridin-3-ylphenyl)benzene. Of course, the first blocking area 60a, the second blocking area 60b and the third blocking area 60c can also be made of other materials as long as they can meet the highest occupied orbital energy level requirements between the light-emitting layer 50.

[0079] Please also read Figure 5 , Figures 6a to 6c On the other hand, an embodiment of the present invention further provides a method for preparing an organic light-emitting display device 100, which can be used to form the organic light-emitting display device 100 provided in the above embodiments. The preparation method includes:

[0080] S100, such as Figure 6a as well as Figure 6b As shown, a substrate 200 having a first electrode layer 10 is provided, and a light-emitting layer 50 is formed on one side of the first electrode layer 10 . The light-emitting layer 50 includes a first light-emitting area 51 , a second light-emitting area 52 and a third light-emitting area 53 emitting different colors.

[0081] S200, such as Figure 6cAs shown, a hole blocking layer 60 is formed on the light-emitting layer 50, and the hole blocking layer 60 includes a first blocking area 60a arranged opposite to the first light-emitting area 51, a second blocking area 60b arranged opposite to the second light-emitting area 52, and a third blocking area 60c arranged opposite to the third light-emitting area 53, wherein the highest occupied orbital energy level of the first blocking area 60a is higher than the highest occupied orbital energy level of the light-emitting layer 50 in the first light-emitting area 51, the highest occupied orbital energy level of the second blocking area 60b is lower than the highest occupied orbital energy level of the light-emitting layer 50 in the second light-emitting area 52, and / or the highest occupied orbital energy level of the third blocking area 60c is lower than the highest occupied orbital energy level of the light-emitting layer 50 in the third light-emitting area 53.

[0082] The method for preparing the organic light-emitting display device 100 provided in the embodiment of the present invention forms a first blocking area 60a arranged opposite to the first light-emitting area 51, a second blocking area 60b arranged opposite to the second light-emitting area 52, and a third blocking area 60c arranged opposite to the third light-emitting area 53 when forming the hole blocking layer 60, and the highest occupied orbital energy level of the first blocking area 60a is higher than the highest occupied orbital energy level of the light-emitting layer 50 in the first light-emitting area 51, so that the organic light-emitting display device 100 can effectively avoid the accumulation of holes in the light-emitting layer 50 and cause the aging of the device during the reliability test, thereby improving the life of the low grayscale light-emitting area such as the blue light-emitting area. The highest occupied orbital energy level of at least one of the second blocking area 60b and the third blocking area 60c is lower than the highest occupied orbital energy level of the light-emitting layer 50 in the second light-emitting area 52 and the third light-emitting area 53, ensuring that the recombination area of ​​electrons and holes is in the central area of ​​the light-emitting layer 50, so that the life attenuation trend of each light-emitting area is consistent, solving the problem of low grayscale color deviation caused by inconsistent life attenuation of different light-emitting areas after the reliability test, and achieving low grayscale reliability improvement.

[0083] like Figure 6d As shown, optionally, in step S100, a hole transport layer 30 and a hole injection layer 20 are also provided on the provided substrate 200, and the first electrode layer 10, the hole injection layer 20 and the hole transport layer 30 are arranged in a direction away from the substrate 200. Optionally, the light-emitting layer 50 can be directly formed on the hole transport layer 30. Of course, an electron blocking layer can be pre-formed on the hole transport layer 30, and then the light-emitting layer 50 is formed.

[0084] Please continue reading Figure 6d As an optional implementation, after step S200, the method further includes forming an electron transport layer 70, an electron injection layer 80 and a second electrode layer 90 on the hole blocking layer 60 to ensure the performance requirements of the organic light-emitting display device 100.

[0085] Optionally, when forming the light-emitting layer 50, a fine metal mask can be used to vapor-deposit a material emitting blue light in the corresponding first light-emitting area 51, and the main body can be 9,9'-(1,3-phenyl)di-9H-carbazole, and the guest can be 9,10-diphenylanthracene. A material emitting red light is vapor-deposited in the second light-emitting area 52, and 9,9'-(1,3-phenyl)di-9H-carbazole can be selected. A material emitting green light is vapor-deposited in the third light-emitting area 53, and 4,4',4"-tri(carbazole-9-yl)triphenylamine can be selected.

[0086] Please also read Figure 7 , Figures 8a to 8c As shown, as an optional implementation, step S200 includes:

[0087] S210, such as Figure 8a As shown, a first material is evaporated above the first light emitting area 51 to form a first blocking block 611 .

[0088] S220, such as Figure 8b As shown, a second material is evaporated on the second light emitting area 52 to form a second blocking block 612 .

[0089] S230, such as Figure 8c As shown, a third material is evaporated on the third light emitting area 53 to form a third blocking block 613 .

[0090] In step S210 , a fine metal mask may be disposed on the light emitting layer 50 , and 4,7-diphenyl-1,10-phenanthroline may be evaporated over corresponding first light emitting regions 51 to form a plurality of first blocking blocks 611 distributed in an array.

[0091] In step S220 , a fine metal mask may be disposed on the light emitting layer 50 , and 1,3,5-tris(1-phenyl-1H-benzimidazol-2-yl)benzene may be evaporated over corresponding second light emitting regions 52 to form a plurality of second blocking blocks 612 distributed in an array.

[0092] In step S230 , a fine metal mask may be disposed on the light emitting layer 50 , and 1,3,5-tri(1-phenyl-1H-benzimidazol-2-yl)benzene may be evaporated over corresponding third light emitting regions 53 to form a plurality of second blocking blocks 612 distributed in an array.

[0093] Optionally, when the second material is the same as the third material, a metal mask can be used to perform step S220 and step S230 simultaneously, so that the second blocking block 612 and the third blocking block 613 are evaporated simultaneously to form the second blocking block and the third blocking block at the same time, thereby improving the preparation efficiency of the hole blocking layer 60.

[0094] Please also read Figure 9a as well as Figure 9b As an optional implementation, before executing step S200, it also includes: forming a second barrier layer 62 on the light-emitting layer 50, which can be formed by evaporation. The second barrier layer 62 is a whole layer structure and covers the first light-emitting area 51, the second light-emitting area 52 and the third light-emitting area 53.

[0095] Optionally, in the step of vapor-depositing the second blocking layer 62 on the light-emitting layer 50, 4,7-diphenyl-1,10-phenanthroline can be specifically vapor-deposited on the light-emitting layer 50 to make it the same material as the first blocking block 611, so as to selectively thicken the material thickness of the first blocking area 60a corresponding to the blue light-emitting area, thereby realizing a long-life blue light device and reducing the problem of low grayscale color deviation after reliability testing.

[0096] It is understandable that in the above embodiment, when the light-emitting layer 50 is formed in step S100, the material for emitting blue light by vapor deposition in the first light-emitting area 51 can also be selected as 9,9'-(1,3-phenyl)di-9H-carbazole as the main body and 9,10-biphenylanthracene as the guest. However, the material for emitting red light by vapor deposition in the second light-emitting area 52 can also be 4,4'-di(9-carbazole)biphenyl, and the material for emitting green light by vapor deposition in the third light-emitting area 53 can also be N,N'-diphenyl-N,N'-(1-naphthyl)-1,1'-biphenyl-4,4'-diamine.

[0097] Optionally, in the above embodiment, in step S200, the first material evaporated in the first blocking area 60a can also be 3-(biphenyl-4-yl)-5-(4-tert-butylphenyl)-4-phenyl-4H-1,2,4-triazole, and the second material evaporated in the second blocking area 60b and the third material evaporated in the third blocking area 60c can both be 1,4-bis(3,5-bipyridin-3-ylphenyl)benzene, as long as they can meet the highest occupied orbital energy level requirements between the light-emitting layer 50.

[0098] Please also read Fig.10On the other hand, an embodiment of the present invention further provides a display device, and the display device includes the organic light-emitting display device 100 provided in the above embodiments. Optionally, the display device may further include an array substrate, and the organic light-emitting display device 100 is arranged on the array substrate, and the organic light-emitting display device 100 is controlled by the pixel circuit on the array substrate to ensure display requirements. The display device can be any product or component with a display function, such as a mobile phone, a tablet computer, a laptop computer, a digital photo frame, a navigator, etc., which may be integrated with a photosensitive component such as a camera. Since the display device provided by an embodiment of the present invention includes the organic light-emitting display device 100 in any of the above embodiments, after the reliability test, the life decay trend of each light-emitting area can be made consistent, so as to solve the problem of low grayscale color deviation caused by inconsistent life decay of different light-emitting areas after the reliability test, thereby achieving low grayscale reliability improvement and ensuring display requirements.

[0099] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An organic light emitting display device, characterized in that: include: a first electrode layer; A light-emitting layer, disposed on one side of the first electrode layer, the light-emitting layer comprising a first light-emitting area, a second light-emitting area and a third light-emitting area emitting different colors; a hole blocking layer, arranged on a side of the light-emitting layer away from the first electrode layer, the hole blocking layer comprising a first blocking region arranged opposite to the first light-emitting region, a second blocking region arranged opposite to the second light-emitting region, and a third blocking region arranged opposite to the third light-emitting region; Among them, the highest occupied orbital energy level of the first blocking zone is higher than the highest occupied orbital energy level of the light-emitting layer in the first light-emitting zone; the highest occupied orbital energy level of the second blocking zone is lower than the highest occupied orbital energy level of the light-emitting layer in the second light-emitting zone, so that electrons and holes recombine in the central area of ​​the second light-emitting zone, and / or the highest occupied orbital energy level of the third blocking zone is lower than the highest occupied orbital energy level of the light-emitting layer in the third light-emitting zone, so that the electrons and holes recombine in the central area of ​​the third light-emitting zone.

2. The organic light emitting display device according to claim 1, characterized in that: The absolute value of the difference between the highest occupied orbital energy level of the first blocking region and the highest occupied orbital energy level of the light-emitting layer in the first light-emitting region is greater than or equal to 0.2 eV and less than or equal to 1 eV; and / or, the absolute value of the difference between the highest occupied orbital energy level of the second blocking region and the highest occupied orbital energy level of the light-emitting layer in the second light-emitting region is greater than or equal to 0.2 eV and less than or equal to 1 eV; And / or, an absolute value of a difference between a highest occupied orbital energy level of the third blocking region and a highest occupied orbital energy level of the light-emitting layer in the third light-emitting region is greater than or equal to 0.2 eV and less than or equal to 1 eV.

3. The organic light emitting display device according to claim 1, characterized in that: The hole blocking layer includes a first blocking layer, the first blocking layer includes a first blocking block distributed in the first blocking region, a second blocking block distributed in the second blocking region, and a third blocking block distributed in the third blocking region, and a material of the first blocking block is different from that of the second blocking block and the third blocking block.

4. The organic light emitting display device according to claim 3, characterized in that: The hole blocking layer also includes a second blocking layer, which is located between the first blocking layer and the light-emitting layer and covers the first light-emitting area, the second light-emitting area and the third light-emitting area. The second blocking layer is a whole layer structure and is made of the same material as the first blocking layer.

5. The organic light emitting display device according to any one of claims 1 to 4, characterized in that: The mobility of the first barrier region is greater than the mobility of the second barrier region and the mobility of the third barrier region.

6. The organic light emitting display device according to any one of claims 1 to 4, characterized in that: The first light-emitting area is a blue light-emitting area, the first blocking area is a blue blocking area, the second light-emitting area is a red light-emitting area, the second blocking area is a red blocking area, the third light-emitting area is a green light-emitting area, and the third blocking area is a green blocking area.

7. The organic light emitting display device according to claim 6, characterized in that: The material of the first barrier zone includes 4,7-diphenyl-1,10-phenanthroline, and the second barrier zone and the third barrier zone respectively include 1,3,5-tris(1-phenyl-1H-benzimidazol-2-yl)benzene; or, the material of the first barrier zone includes 3-(biphenyl-4-yl)-5-(4-tert-butylphenyl)-4-phenyl-4H-1,2,4-triazole, and the material of the second barrier zone and the third barrier zone respectively include 1,4-bis(3,5-dipyridin-3-ylphenyl)benzene.

8. A method for preparing an organic light-emitting display device, characterized in that: include: Providing a substrate having a first electrode layer, forming a light-emitting layer on one side of the first electrode layer, the light-emitting layer comprising a first light-emitting area, a second light-emitting area and a third light-emitting area emitting different colors; A hole blocking layer is formed on the light-emitting layer, wherein the hole blocking layer includes a first blocking region arranged opposite to the first light-emitting region, a second blocking region arranged opposite to the second light-emitting region, and a third blocking region arranged opposite to the third light-emitting region, wherein the highest occupied orbital energy level of the first blocking region is higher than the highest occupied orbital energy level of the light-emitting layer in the first light-emitting region; the highest occupied orbital energy level of the second blocking region is lower than the highest occupied orbital energy level of the light-emitting layer in the second light-emitting region, so that electrons and holes recombine in the central area of ​​the second light-emitting region, and / or the highest occupied orbital energy level of the third blocking region is lower than the highest occupied orbital energy level of the light-emitting layer in the third light-emitting region, so that the electrons and holes recombine in the central area of ​​the third light-emitting region.

9. The method for preparing an organic light emitting display device according to claim 8, characterized in that: The step of forming a hole blocking layer on the light-emitting layer comprises: A first blocking layer is formed on the light-emitting layer, the first blocking layer includes a first blocking block distributed in the first light-emitting area, a second blocking block distributed in the second light-emitting area, and a third blocking block distributed in the third light-emitting area, and a material of the first blocking block is different from that of the second blocking block and the third blocking block.

10. The method for preparing an organic light emitting display device according to claim 9, characterized in that: The step of forming a first blocking layer on the light-emitting layer comprises: Vapor-depositing a first material on the first light-emitting area to form a first blocking block; Vapor-depositing a second material on the second light-emitting area to form a second blocking block; A third material is evaporated on the third light emitting area to form a third blocking block.

11. The method for preparing an organic light-emitting display device according to claim 8 or 9, characterized in that: Before the step of forming a first barrier layer on the light-emitting layer, the method further includes: A second blocking layer is formed on the light-emitting layer, wherein the second blocking layer is a whole-layer structure and covers the first light-emitting area, the second light-emitting area and the third light-emitting area.

12. A display device, characterized in that: Comprising the organic light emitting display device as claimed in any one of claims 1 to 7.

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