Display substrate and display device

Abstract

The invention discloses a display substrate and a display device, and the display substrate comprises a plurality of light-emitting devices which are distributed in different sub-pixel regions at intervals, and the adjacent light-emitting devices are separated through a pixel definition layer; the light-emitting device comprises a first electrode, a light-emitting function layer and a second electrode which are sequentially arranged on the substrate in the direction away from the substrate. The light-emitting functional layer extends to the surface of one side, far away from the substrate, of the pixel definition layer; an area, corresponding to a contact position of the pixel definition layer and the first electrode, of the light-emitting functional layer is a curved surface, and the slope angle of the curved surface is theta; when the display substrate displays white light at a 255 gray scale, each light-emitting device satisfies the following formula: [delta] u'v '(horizon)-[delta] u'v' (vertical) / 0.004 < = 1 (1) [theta] (horizon)-[theta] (vertical) < = 10 degrees (2). The color cast of the display substrate at different angles is small, and the color cast at different angles in the horizontal direction and the vertical direction is closer.

Description

Technical Field

[0001] The embodiments of the present application relate to but are not limited to the field of display technology, and in particular to a display substrate and a display device. Background Art

[0002] In recent years, organic light emitting devices (OLED) have gradually attracted more attention as a new type of flat panel display. Due to its characteristics of active luminescence, high luminous brightness, high resolution, wide viewing angle, fast response speed, low energy consumption and flexibility, it has become a hot mainstream display product in the market. With the continuous development of products, customers have higher and higher resolution requirements for products and lower and lower power consumption requirements. It is necessary to develop high-efficiency, low-voltage and long-life devices. The optimization and performance improvement of devices can be achieved by improving any layer in the device and the combination of different layers of materials. At the same time, the microcavity effect of the entire device can be increased by optimization, thereby increasing the light coupling efficiency.

[0003] With the continuous upgrading of products, customers have higher and higher requirements for the display of new products. More attention is paid to the color changes at different viewing angles and the color changes at different angles in the horizontal and vertical directions. Moreover, the difference in color change trends in the horizontal and vertical directions of display products is also a problem worthy of attention and improvement. Summary of the invention

[0004] The following is an overview of the subject matter described in detail herein. This overview is not intended to limit the scope of protection of this application.

[0005] The embodiments of the present application provide a display substrate and a display device, wherein the color deviation of the display substrate at different angles is small, and the color deviation at different angles in the horizontal direction and the vertical direction is closer.

[0006] The embodiment of the present application provides a display substrate, the display substrate comprising: a plurality of light-emitting devices spaced apart in different sub-pixel regions, adjacent light-emitting devices being spaced apart by a pixel definition layer; the light-emitting device comprising a first electrode, a light-emitting function layer, and a second electrode sequentially arranged on the substrate in a direction away from the substrate; the light-emitting function layer extends to a surface of the pixel definition layer away from the substrate; in the process of the light-emitting function layer extending from the first electrode to the pixel definition layer, the thickness of the light-emitting function layer changes; the light-emitting function layer is a curved surface in a region corresponding to a contact position between the pixel definition layer and the first electrode, and the slope angle of the curved surface is θ;

[0007] When the display substrate displays white light at 255 grayscale, each of the light-emitting devices satisfies the following formula:

[0008] |Δu′v′(horizon)-Δu′v′(vertical)| / 0.004≤1 (1)

[0009] θ(horizon)-θ(vertical) ≤10° (2)

[0010] Wherein, θ is the angle between the straight line BC and the straight line BD, B is the intersection of the pixel definition layer and the first electrode, C is the starting point where the thickness of the light-emitting functional layer changes, and D is the end point where the thickness of the light-emitting functional layer changes; points B, C, and D are selected on the same cross section perpendicular to the substrate;

[0011] |Δu′v′(horizon)-Δu′v′(vertical)| / 0.004 is the absolute value of the color deviation in the horizontal and vertical directions;

[0012]

[0013] u′ n and v′ n is the color coordinate at different viewing angles, u′ 0 and v′ 0 It is the color coordinate at 0° viewing angle; different viewing angles refer to the range of -75° to 75°, with each 5° interval from 0° as one viewing angle;

[0014] θ (horizon) is the slope angle of the curved surface in the horizontal direction, and θ (vertical) is the slope angle of the curved surface in the vertical direction.

[0015] In some embodiments of the present application, point C and point D may satisfy:

[0016] LC = 101.3% L;

[0017] LD = 101.3% L;

[0018] Wherein, L is the thickness of the light-emitting functional layer between the first electrode and the second electrode; LC is the thickness of the light-emitting functional layer at point C; and LD is the thickness of the light-emitting functional layer at point D. In some embodiments of the present application, the light-emitting device further comprises at least two covering layers stacked on the second electrode in a direction away from the substrate, and the refractive index of the covering layers decreases in sequence in a direction away from the substrate.

[0019] In some embodiments of the present application, the refractive index difference between two adjacent covering layers is greater than 0.3.

[0020] In some embodiments of the present application, the light-emitting device includes a first covering layer and a second covering layer stacked in sequence in a direction away from the substrate, the refractive index of the first covering layer in the visible light band is greater than 1.75, and the refractive index of the second covering layer in the visible light band is less than 1.7.

[0021] In some embodiments of the present application, the thickness of the first covering layer may be L1, and the thickness of the second covering layer may be L2; L1 and L2 satisfy: 0.7L1≤L2≤1.3L1.

[0022] In some embodiments of the present application, the thickness of the first covering layer may be 600 angstroms to 800 angstroms.

[0023] In some embodiments of the present application, the plurality of light-emitting devices include red light-emitting devices, green light-emitting devices, and blue light-emitting devices that are distributed at intervals; the thickness of the light-emitting functional layer of the red light-emitting device located between the first electrode and the second electrode is LR, the thickness of the light-emitting functional layer of the green light-emitting device located between the first electrode and the second electrode is LG, and the thickness of the light-emitting functional layer of the blue light-emitting device located between the first electrode and the second electrode is LB; L1 and L2 satisfy at least one of the following conditions:

[0024] a) 1.5≤LR / (L1+L2)≤2;

[0025] b)1≤LG / (L1+L2)≤1.6;

[0026] c)0.7≤LB / (L1+L2)≤1.4.

[0027] In some embodiments of the present application, the first covering layer may include at least one of the materials having the following general formula:

[0028]

[0029] Among them, Ar 1 To Ar 3Each of them is independently hydrogen, deuterium, nitrile, nitro, hydroxyl, carbonyl, ester, imide, amide, substituted or unsubstituted C1-C30 alkyl, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C30 alkoxy, substituted or unsubstituted C5-C30 aryloxy, substituted or unsubstituted C1-C30 alkylthio, arylthio, substituted or unsubstituted C1-C30 alkylsulfonyl, arylsulfonyl, alkenyl, silanyl, boronyl, amine, arylphosphino, phosphine oxide, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C5-C30 heteroaryl or the group represented by the general formula II; here, substituted C1-C30 alkyl, substituted C3-C30 cycloalkyl, substituted C1-C30 alkoxy The oxy group, substituted C5-C30 aryloxy group, substituted C1-C30 alkylthio group, substituted C1-C30 alkylsulfonyl group, substituted C6-C30 aryl group, substituted C5-C30 heteroaryl group refer to groups substituted by one or more of the following groups: deuterium, nitrile group, nitro group, hydroxyl group, carbonyl group, ester group, imido group, amide group, C1-C30 alkyl group, C3-C30 cycloalkyl group, C1-C30 alkoxy group, C5-C30 aryloxy group, C1-C30 alkylthio group, arylthio group, C1-C30 alkylsulfonyl group, arylsulfonyl group, alkenyl group, silanyl group, boron group, amine group, arylphosphino group, phosphine oxide group, C6-C30 aryl group, C5-C30 heteroaryl group; wherein the substituents on two adjacent C groups are optionally combined with each other to form a ring; and Ar 1 To Ar 3 At least one of them is a group represented by the general formula II;

[0030] X is S or O;

[0031] L is a substituted or unsubstituted C6-C30 arylene group or a substituted or unsubstituted C5-C30 heteroarylene group; herein, the substituted C6-C30 arylene group and the substituted C5-C30 heteroarylene group refer to groups substituted by one or more of the following groups: deuterium, nitrile, nitro, hydroxyl, carbonyl, ester, imido, amide, C1-C30 alkyl, C3-C30 cycloalkyl, C1-C30 alkoxy, C5-C30 aryloxy, C1-C30 alkylthio, arylthio, C1-C30 alkylsulfonyl, arylsulfonyl, alkenyl, silanyl, boronyl, amine, arylphosphino, phosphine oxide, C6-C30 aryl, or C5-C30 heteroaryl.

[0032] In some embodiments of the present application, Ar 1 To Ar 3 Any one or two of can be selected from the following groups:

[0033]

[0034]

[0035]

[0036] In some embodiments of the present application, L in Formula II can be selected from the following groups:

[0037]

[0038] In some embodiments of the present application, the material of the second covering layer may contain any one or more of the following groups: a cycloalkyl group containing a non-conjugated fragment, a diamond group containing a non-conjugated fragment, an amine group containing a non-conjugated fragment, an ester group containing a non-conjugated fragment, a nitro group, a sulfonic acid group, a phosphorus oxygen group, a halogen group and a cyano group.

[0039] In some embodiments of the present application, the second covering layer may include a material having the following general formula:

[0040]

[0041] Among them, Ar 4 ,Ar 5 Each is independently hydrogen, halogen, nitro, nitrile, substituted or unsubstituted amide, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C5-C30 heteroaryl, substituted or unsubstituted C1-C30 alkyl, substituted or unsubstituted heteroalkyl, substituted or unsubstituted C1-C30 alkoxy, substituted or unsubstituted thioether, substituted or unsubstituted silanyl, substituted or unsubstituted phosphoryl; Here, substituted amide, substituted aryl, substituted heteroaryl, substituted alkyl, substituted heteroalkyl, substituted alkoxy, substituted thioether, substituted The silyl group and substituted phosphorus oxygen group refer to being substituted by one or more of the following groups: deuterium, nitrile, nitro, hydroxyl, carbonyl, ester, imide, amide, C1-C30 alkyl, C3-C30 cycloalkyl, C1-C30 alkoxy, C5-C30 aryloxy, C1-C30 alkylthio, arylthio, C1-C30 alkylsulfonyl, arylsulfonyl, alkenyl, silanyl, boronyl, amine, arylphosphino, phosphine oxide, C6-C30 aryl, C5-C30 heteroaryl; wherein the substituents on two adjacent C groups are optionally combined with each other to form a ring;

[0042] L 1 , L 2Each is independently a substituted or unsubstituted C6-C30 arylene group or a substituted or unsubstituted C5-C30 heteroarylene group; herein, the substituted C6-C30 arylene group and the substituted C5-C30 heteroarylene group refer to being substituted by one or more of the following groups: deuterium, nitrile, nitro, hydroxyl, carbonyl, ester, imide, amide, C1-C30 alkyl, C3-C30 cycloalkyl, C1-C30 alkoxy, C5-C30 aryloxy, C1-C30 alkylthio, arylthio, C1-C30 alkylsulfonyl, arylsulfonyl, alkenyl, silanyl, boronyl, amine, arylphosphinyl, phosphine oxide, C6-C30 aryl, C5-C30 heteroaryl.

[0043] In some embodiments of the present application, the display substrate may further include an isolation column, which is located on a side of the pixel definition layer away from the substrate, and the isolation column is configured to separate a common film layer between the plurality of light-emitting devices.

[0044] In some embodiments of the present application, the height of the isolation column may be ≤2 microns.

[0045] In some embodiments of the present application, the light-emitting functional layer may include: a hole injection layer, a hole transport layer, an electron blocking layer, a light-emitting layer, a hole blocking layer, an electron transport layer and an electron injection layer.

[0046] In some embodiments of the present application, the material of the hole injection layer may include a transition metal oxide; or, the material of the hole injection layer may include a hole transport material and a p-type dopant;

[0047] The transition metal oxide may include any one or more of molybdenum oxide, titanium oxide, vanadium oxide, rhenium oxide, ruthenium oxide, chromium oxide, zirconium oxide, hafnium oxide, tantalum oxide, silver oxide, tungsten oxide, and manganese oxide;

[0048] The p-type dopant may include any one or more of 2,3,6,7,10,11-hexacyano-1,4,5,8,9,12-hexaazatriphenylene, 2,3,5,6-tetrafluoro-7,7',8,8'-tetracyano-p-benzoquinone, and 1,2,3-tris[(cyano)(4-cyano-2,3,5,6-tetrafluorophenyl)methylene]cyclopropane;

[0049] The hole transport material may include any one or more of an aromatic amine hole transport material, a dimethylfluorene hole transport material, and a carbazole hole transport material.

[0050] In some embodiments of the present application, the material of the hole transport layer may include any one or more of aromatic amine hole transport materials, dimethylfluorene hole transport materials, and carbazole hole transport materials.

[0051] In some embodiments of the present application, the material of the electron blocking layer may include any one or more of an aromatic amine electron blocking material, a dimethylfluorene electron blocking material, and a carbazole electron blocking material.

[0052] In some embodiments of the present application, the light-emitting layer may include a red light-emitting material, a green light-emitting material, or a blue light-emitting material;

[0053] The red light-emitting material may include any one or more of a DCM-type red light-emitting material and a metal complex-type red light-emitting material;

[0054] The green luminescent material may include any one or more of coumarin dyes, quinacridone copper derivatives green luminescent materials, polycyclic aromatic hydrocarbons green luminescent materials, diamine anthracene derivatives green luminescent materials, carbazole derivatives green luminescent materials and metal complex green luminescent materials;

[0055] The blue light-emitting material may include any one or more of pyrene derivative blue light-emitting materials, anthracene derivative blue light-emitting materials, fluorene derivative blue light-emitting materials, perylene derivative blue light-emitting materials, styrylamine derivative blue light-emitting materials and metal complex blue light-emitting materials.

[0056] In some embodiments of the present application, the material of the hole blocking layer may include any one or more of benzimidazole derivative hole blocking materials, imidazopyridine derivative hole blocking materials, benzimidazolephenanthridine derivative hole blocking materials, pyrimidine derivative hole blocking materials, triazine derivative hole blocking materials, quinoline derivative hole blocking materials, isoquinoline derivative hole blocking materials, and phenanthroline derivative hole blocking materials.

[0057] In some embodiments of the present application, the material of the electron transport layer may include any one or more of benzimidazole derivative electron transport materials, imidazopyridine derivative electron transport materials, benzimidazolephenanthridine derivative electron transport materials, pyrimidine derivative electron transport materials, triazine derivative electron transport materials, quinoline derivative electron transport materials, isoquinoline derivative electron transport materials, and phenanthroline derivative electron transport materials.

[0058] In some embodiments of the present application, the material of the electron injection layer may include any one or more of an alkali metal electron injection material and a metal electron injection material.

[0059] The embodiment of the present application further provides a display device, which includes the display substrate described in the embodiment of the present application.

[0060] Other features and advantages of the present application will be described in the following description, and partly become clearer from the description, or understood by practicing the present application. Other advantages of the present application can be realized and obtained by the schemes described in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] The accompanying drawings are used to provide an understanding of the technical solution of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application and do not constitute a limitation on the technical solution of the present application.

[0062] Figure 1 This is a schematic diagram of the structure of an exemplary display substrate of the present application;

[0063] Figure 2 for Figure 1 A partial enlarged view of

[0064] Figure 3 This is a schematic structural diagram of a light-emitting device of an exemplary display substrate of the present application;

[0065] Figure 4 is a schematic diagram of a slope angle θ in a scanning electron microscope image of an exemplary display substrate of the present application;

[0066] Figure 5 is a schematic cross-sectional structure diagram of another display substrate according to an exemplary embodiment of the present application;

[0067] Figure 6 is a schematic cross-sectional structure diagram of another display substrate according to an exemplary embodiment of the present application;

[0068] Figure 7 A scanning electron microscope image of an exemplary device in the embodiment of the present application in the horizontal direction;

[0069] Figure 8 for Figure 7 Scanning electron microscope image of the device in the vertical direction;

[0070] Fig. 9 This is a scanning electron microscope image of the comparative device of the present application in the horizontal direction;

[0071] Fig.10 for Fig. 9 Scanning electron microscope image of the device in the vertical direction;

[0072] Fig.11 This is a schematic diagram of the change of color shift of an exemplary device according to an embodiment of the present application with respect to angle;

[0073] Fig.12 Schematic diagram of the color shift of the comparative device of the present application changing with the angle.

[0074] The meanings of the symbols in the accompanying drawings are:

[0075] 10-first electrode; 20-light-emitting functional layer; 30-second electrode; 41-first covering layer; 42-second covering layer; 100-substrate; 201-red light-emitting device; 202-green light-emitting device; 203-blue light-emitting device; 301-pixel definition layer; 302-first isolation structure; 303-second isolation structure; 401-first encapsulation layer; 402-second encapsulation layer; 403-third encapsulation layer. DETAILED DESCRIPTION

[0076] In order to make the purpose, technical solution and advantages of the present application more clear, the embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other arbitrarily without conflict.

[0077] The embodiments of the present application are not necessarily limited to the dimensions shown in the drawings. The shapes and sizes of the components in the drawings belong to the preferred embodiments and may also be other shapes and sizes. In addition, the drawings schematically show ideal examples, and the embodiments of the present application are not limited to the shapes or values ​​shown in the drawings.

[0078] The size and proportion relationship between the various film layers or components in the drawings of this application can be used as a reference in the actual process, which is an implementation method with good technical effects, but is not limited to this. For example, the width-to-length ratio of the light-emitting layer, the thickness and spacing of each film layer can be adjusted according to actual needs.

[0079] The ordinal numbers such as "first" and "second" in this application are provided to avoid confusion among constituent elements and do not indicate any order, quantity or importance.

[0080] In this application, for the sake of convenience, the words and phrases indicating the orientation or positional relationship such as "middle", "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like are used to illustrate the positional relationship of the constituent elements with reference to the drawings. This is only for the convenience of describing this specification and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on this application. The positional relationship of the constituent elements is appropriately changed according to the direction in which each constituent element is described. Therefore, it is not limited to the words and phrases described in the disclosure and can be appropriately replaced according to the circumstances.

[0081] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate, or the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0082] In this application, "film" and "layer" can be interchanged. For example, "luminescent layer" can be replaced by "luminescent film" in some cases. Similarly, "insulating film" can be replaced by "insulating layer" in some cases.

[0083] An embodiment of the present application provides a display substrate. Figure 1 This is a schematic diagram of the structure of an exemplary display substrate of the present application; Figure 2 for Figure 1 A partial enlarged view of Figure 3 This is a schematic structural diagram of a light-emitting device of a display substrate exemplified in the present application (taking a red light-emitting device 201 as an example); Figure 4 Schematic diagram of the slope angle θ in a scanning electron microscope image of an exemplary display substrate of the present application.

[0084] like Figures 1 to 4 As shown, the display substrate includes a plurality of light-emitting devices spaced apart and distributed in different sub-pixel regions, for example, a red light-emitting device 201 located in a red sub-pixel, a green light-emitting device 202 located in a green sub-pixel, and a blue light-emitting device 203 located in a blue sub-pixel; two adjacent light-emitting devices are spaced apart by an isolation structure, and the isolation structure includes a pixel definition layer 301 located on the substrate between the two adjacent light-emitting devices;

[0085] The light emitting device comprises a first electrode 10, a light emitting functional layer 20 and a second electrode 30 which are sequentially arranged on the substrate 100 in a direction away from the substrate 100;

[0086] The light-emitting functional layer extends to the surface of the pixel definition layer 301 away from the substrate 100; in the process of the light-emitting functional layer extending from the first electrode 10 to the pixel definition layer 301, the thickness of the light-emitting functional layer changes; the corresponding area of ​​the light-emitting functional layer at the contact position between the pixel definition layer 301 and the first electrode 10 is a curved surface, and the slope angle of the curved surface is θ;

[0087] When the display substrate displays white light at 255 grayscale, each of the light-emitting devices satisfies the following formula:

[0088] |Δu′v′(horizon)-Δu′v′(vertical)| / 0.004≤1 (1)

[0089] θ(horizon)-θ(vertical) ≤10° (2)

[0090] Wherein, θ is the angle between the straight line BC and the straight line BD, B is the intersection of the pixel definition layer and the first electrode, C is the starting point where the thickness of the light-emitting functional layer changes, and D is the end point where the thickness of the light-emitting functional layer changes; points B, C, and D are selected on the same cross section perpendicular to the substrate;

[0091] |Δu′v′(horizon)-Δu′v′(vertical)| / 0.004 is the absolute value of the color deviation in the horizontal and vertical directions;

[0092]

[0093] u′ n and v′ n is the color coordinate at different viewing angles, u′ 0 and v′ 0 It is the color coordinate at 0° viewing angle; different viewing angles refer to the range of -75° to 75°, with each 5° interval from 0° as one viewing angle;

[0094] θ (horizon) is the slope angle of the curved surface in the horizontal direction, and θ (vertical) is the slope angle of the curved surface in the vertical direction.

[0095] It should be noted that formulas (1) and (2) are for the same light-emitting device, but the multiple different light-emitting devices of the display substrate of the embodiment of the present application all satisfy formulas (1) and (2).

[0096] The display substrate of the embodiment of the present application has a smaller color deviation at different angles, and the color deviation at different angles in the horizontal direction and the vertical direction is closer.

[0097] In some embodiments of the present application, point C and point D may satisfy:

[0098] LC = 101.3% L;

[0099] LD = 101.3% L;

[0100] Wherein, L is the thickness of the light-emitting functional layer located between the first electrode and the second electrode; LC is the thickness of the light-emitting functional layer at point C; and LD is the thickness of the light-emitting functional layer at point D.

[0101] In the process of the light-emitting functional layer extending from the first electrode to the pixel definition layer, the thickness of the light-emitting functional layer changes as follows: it extends a length with a thickness L on the surface of the first electrode, then increases and then decreases in the process of extending to the pixel definition layer, and then extends a length with a thickness L on the surface of the pixel definition layer.

[0102] like Figure 2 and Figure 4 As shown, a straight line AB is taken along the horizontal direction of the upper surface of the first electrode 10 (for example, it can be an anode), and B is the intersection of the pixel definition layer 301 and the upper surface of the first electrode 10. The thickness of the light-emitting functional layer 20 between the first electrode 10 and the second electrode 30 of the light-emitting device is the optical thickness of the EI device. In the same sub-pixel, each film layer of the light-emitting functional layer is deposited on the relatively flat surface of the first electrode 10, and the thickness of a film layer is the same in different regions. Therefore, along the direction from A to B, the thickness of the light-emitting functional layer is the optical thickness L of the EI device, and the surface of the light-emitting functional layer away from the substrate 100 is parallel to the AB line. There is a corner at the junction of the first electrode 10 and the pixel definition layer 301, and the thickness of the light-emitting functional layer will change, generally increasing first and then decreasing, until it is restored to be approximately the same as the optical thickness L of the EI device. After the thickness of the light-emitting functional layer is restored to be approximately the same as the optical thickness L of the EI device, the light-emitting functional layer maintains a thickness of approximately L on the surface of the pixel definition layer 301 and extends for a length. Therefore, the corresponding area of ​​the light-emitting functional layer at the contact position between the pixel definition layer 301 and the first electrode 10 is a curved surface, one end of the curved surface is the starting point C where the thickness of the light-emitting functional layer changes (for example, the point when the thickness of the light-emitting functional layer LC=101.3% L), the other end of the curved surface is the end point D where the thickness of the light-emitting functional layer changes (for example, the point when the thickness of the light-emitting functional layer LD=101.3% L), and the center of the curved surface is the intersection B of the pixel definition layer 301 and the upper surface of the first electrode 10, wherein the points B, C, and D are selected on the same cross section perpendicular to the substrate 100. Therefore, the slope angle θ of the curved surface is the angle between the straight line BC and the straight line BD.

[0103] When calculating the value of θ, you can first use trigonometric functions to calculate θ1 and θ2, and then calculate the value of θ.

[0104] In some embodiments of the present application, θ(horizon)>30°, θ(vertical)>30°.

[0105] In some embodiments of the present application, the light-emitting device may further include at least two covering layers stacked in a direction away from the substrate, and the refractive index of the covering layers decreases successively in the direction away from the substrate.

[0106] The design of the multi-layer covering layer can make the change of the slope angle θ of the curved surface more stable.

[0107] In some embodiments of the present application, the refractive index difference between two adjacent covering layers may be greater than 0.3.

[0108] In some embodiments of the present application, Figure 3 As shown, the light emitting device may include a first covering layer 41 and a second covering layer 42 stacked in sequence in a direction away from the substrate 100, the refractive index of the first covering layer 41 in the visible light band is greater than 1.75, and the refractive index of the second covering layer 42 in the visible light band is less than 1.7.

[0109] For example, the refractive index n1 of the first covering layer in the visible light band may satisfy: 1.75≤n1≤2.

[0110] For example, the refractive index n2 of the second covering layer in the visible light band may satisfy: 1.4≤n2≤1.7.

[0111] In some embodiments of the present application, the thickness of the first covering layer may be L1, and the thickness of the second covering layer may be L2; L1 and L2 satisfy: 0.7L1≤L2≤1.3L1.

[0112] For example, L2 can be 0.7L1, 0.8L1, 0.9L1, L1, 1.1L1, 1.2L1 or 1.3L1.

[0113] When L1 and L2 satisfy 0.7L1≤L2≤1.3L1, it is beneficial for the display substrate to display white light at 255 gray levels, and the light-emitting device satisfies the above formulas (1) and (2).

[0114] In some embodiments of the present application, the thickness of the first covering layer may be 600 angstroms to 800 angstroms. For example, the thickness of the first covering layer may be 600 angstroms, 620 angstroms, 640 angstroms, 660 angstroms, 680 angstroms, 700 angstroms, 720 angstroms, 740 angstroms, 760 angstroms, 780 angstroms or 800 angstroms.

[0115] In some embodiments of the present application, the plurality of light emitting devices include red light emitting devices, green light emitting devices and blue light emitting devices distributed at intervals;

[0116] The thickness of the light-emitting functional layer of the red light-emitting device between the first electrode and the second electrode is LR, the thickness of the light-emitting functional layer of the green light-emitting device between the first electrode and the second electrode is LG, and the thickness of the light-emitting functional layer of the blue light-emitting device between the first electrode and the second electrode is LB; L1 and L2 satisfy at least one of the following conditions:

[0117] a) 1.5≤LR / (L1+L2)≤2;

[0118] b)1≤LG / (L1+L2)≤1.6;

[0119] c)0.7≤LB / (L1+L2)≤1.4.

[0120] In some embodiments of the present application, L1 and L2 simultaneously satisfy 1.5≤LR / (L1+L2)≤2, 1≤LG / (L1+L2)≤1.6, and 0.7≤LB / (L1+L2)≤1.4.

[0121] When L1 and L2 satisfy any one or more of 1.5≤LR / (L1+L2)≤2, 1≤LG / (L1+L2)≤1.6, 0.7≤LB / (L1+L2)≤1.4, it is beneficial for the display substrate to satisfy the above formulas (1) and (2) when displaying white light at 255 gray levels.

[0122] In some embodiments of the present application, the first covering layer may include at least one of the materials having the following general formula:

[0123]

[0124] Among them, Ar 1 To Ar 3Each of them is independently hydrogen, deuterium, nitrile, nitro, hydroxyl, carbonyl, ester, imide, amide, substituted or unsubstituted C1-C30 alkyl, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C30 alkoxy, substituted or unsubstituted C5-C30 aryloxy, substituted or unsubstituted C1-C30 alkylthio, arylthio, substituted or unsubstituted C1-C30 alkylsulfonyl, arylsulfonyl, alkenyl, silanyl, boronyl, amine, arylphosphino, phosphine oxide, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C5-C30 heteroaryl or the group represented by the general formula II; here, substituted C1-C30 alkyl, substituted C3-C30 cycloalkyl, substituted C1-C30 alkoxy The oxy group, substituted C5-C30 aryloxy group, substituted C1-C30 alkylthio group, substituted C1-C30 alkylsulfonyl group, substituted C6-C30 aryl group, substituted C5-C30 heteroaryl group refer to groups substituted by one or more of the following groups: deuterium, nitrile group, nitro group, hydroxyl group, carbonyl group, ester group, imido group, amide group, C1-C30 alkyl group, C3-C30 cycloalkyl group, C1-C30 alkoxy group, C5-C30 aryloxy group, C1-C30 alkylthio group, arylthio group, C1-C30 alkylsulfonyl group, arylsulfonyl group, alkenyl group, silanyl group, boron group, amine group, arylphosphino group, phosphine oxide group, C6-C30 aryl group, C5-C30 heteroaryl group; wherein the substituents on two adjacent C groups are optionally combined with each other to form a ring; and Ar 1 To Ar 3 At least one of them is a group represented by the general formula II;

[0125] X is S or O;

[0126] L is a substituted or unsubstituted C6-C30 arylene group or a substituted or unsubstituted C5-C30 heteroarylene group; herein, the substituted C6-C30 arylene group and the substituted C5-C30 heteroarylene group refer to groups substituted by one or more of the following groups: deuterium, nitrile, nitro, hydroxyl, carbonyl, ester, imido, amide, C1-C30 alkyl, C3-C30 cycloalkyl, C1-C30 alkoxy, C5-C30 aryloxy, C1-C30 alkylthio, arylthio, C1-C30 alkylsulfonyl, arylsulfonyl, alkenyl, silanyl, boronyl, amine, arylphosphino, phosphine oxide, C6-C30 aryl, or C5-C30 heteroaryl.

[0127] In some embodiments of the present application, Ar 1 To Ar 3 Any one or two of can be selected from the following groups:

[0128]

[0129]

[0130]

[0131] In some embodiments of the present application, L in Formula II can be selected from the following groups:

[0132]

[0133]

[0134] In some embodiments of the present application, the material of the second covering layer may contain any one or more of the following groups: a cycloalkyl group containing a non-conjugated fragment, a diamond group containing a non-conjugated fragment, an amine group containing a non-conjugated fragment, an ester group containing a non-conjugated fragment, a nitro group, a sulfonic acid group, a phosphorus oxygen group, a halogen group and a cyano group.

[0135] In some embodiments of the present application, the second covering layer may include a material having the following general formula:

[0136]

[0137] Among them, Ar 4 ,Ar 5 Each is independently hydrogen, halogen, nitro, nitrile, substituted or unsubstituted amide, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C5-C30 heteroaryl, substituted or unsubstituted C1-C30 alkyl, substituted or unsubstituted heteroalkyl, substituted or unsubstituted C1-C30 alkoxy, substituted or unsubstituted thioether, substituted or unsubstituted silanyl, substituted or unsubstituted phosphoryl; Here, substituted amide, substituted aryl, substituted heteroaryl, substituted alkyl, substituted heteroalkyl, substituted alkoxy, substituted thioether, substituted The silyl group and substituted phosphorus oxygen group refer to being substituted by one or more of the following groups: deuterium, nitrile, nitro, hydroxyl, carbonyl, ester, imide, amide, C1-C30 alkyl, C3-C30 cycloalkyl, C1-C30 alkoxy, C5-C30 aryloxy, C1-C30 alkylthio, arylthio, C1-C30 alkylsulfonyl, arylsulfonyl, alkenyl, silanyl, boronyl, amine, arylphosphino, phosphine oxide, C6-C30 aryl, C5-C30 heteroaryl; wherein the substituents on two adjacent C groups are optionally combined with each other to form a ring;

[0138] L 1 , L 2Each is independently a substituted or unsubstituted C6-C30 arylene group or a substituted or unsubstituted C5-C30 heteroarylene group; herein, the substituted C6-C30 arylene group and the substituted C5-C30 heteroarylene group refer to being substituted by one or more of the following groups: deuterium, nitrile, nitro, hydroxyl, carbonyl, ester, imide, amide, C1-C30 alkyl, C3-C30 cycloalkyl, C1-C30 alkoxy, C5-C30 aryloxy, C1-C30 alkylthio, arylthio, C1-C30 alkylsulfonyl, arylsulfonyl, alkenyl, silanyl, boronyl, amine, arylphosphinyl, phosphine oxide, C6-C30 aryl, C5-C30 heteroaryl.

[0139] In some embodiments of the present application, different light-emitting devices are separated by a pixel definition layer, but there may be some common film layers extending continuously between the multiple light-emitting devices, such as an encapsulation layer. These common film layers connect different sub-pixels, and thus may cause color crosstalk. In order to solve this problem, the display substrate may further include an isolation column, which is located on a side of the pixel definition layer away from the substrate, and the isolation column is configured to separate the common film layers between the multiple light-emitting devices.

[0140] In some embodiments of the present application, the height of the isolation column may be ≤2 microns.

[0141] When the height of the isolation column does not exceed 2 micrometers, the blocking of light by the isolation column can be reduced.

[0142] In some embodiments of the present application, the light-emitting functional layer may also include: a hole injection layer (Hole Injection Layer, HIL), a hole transport layer (Hole Transport Layer, HTL), an electron blocking layer (Electron Block Layer, EBL), an emitting layer (Emitting Layer, EML), a hole blocking layer (Hole Block Layer, HBL), an electron transport layer (Electron Transport Layer, ETL) and an electron injection layer (Electron Injection Layer, EIL).

[0143] In some embodiments of the present application, the material of the hole injection layer may include a transition metal oxide; or, the material of the hole injection layer includes a hole transport material and a p-type dopant.

[0144] In some embodiments of the present application, the transition metal oxide may include any one or more of molybdenum oxide, titanium oxide, vanadium oxide, rhenium oxide, ruthenium oxide, chromium oxide, zirconium oxide, hafnium oxide, tantalum oxide, silver oxide, tungsten oxide, and manganese oxide;

[0145] In some embodiments of the present application, the p-type dopant may include any one or more of 2,3,6,7,10,11-hexacyano-1,4,5,8,9,12-hexaazatriphenylene, 2,3,5,6-tetrafluoro-7,7',8,8'-tetracyanoquinodimethane (F4TCNQ), and 1,2,3-tris[(cyano)(4-cyano-2,3,5,6-tetrafluorophenyl)methylene]cyclopropane.

[0146] In some embodiments of the present application, the hole transport material may include any one or more of an aromatic amine hole transport material, a dimethylfluorene hole transport material, and a carbazole hole transport material.

[0147] In some embodiments of the present application, the material of the hole transport layer may include any one or more of aromatic amine hole transport materials, dimethylfluorene hole transport materials, and carbazole hole transport materials.

[0148] For example, the hole transport material may include any one or more of 4,4'-bis[N-(1-naphthyl)-N-phenylamino]biphenyl (NPB), N,N'-bis(3-methylphenyl)-N,N'-diphenyl-[1,1'-biphenyl]-4,4'-diamine (TPD), 4-phenyl-4'-(9-phenylfluorene-9-yl)triphenylamine (BAFLP), 4,4'-bis[N-(9,9-dimethylfluorene-2-yl)-N-phenylamino]biphenyl (DFLDPBi), 4,4'-di(9-carbazolyl)biphenyl (CBP) and 9-phenyl-3-[4-(10-phenyl-9-anthracenyl)phenyl]-9H-carbazole (PCzPA).

[0149] In some embodiments of the present application, the material of the electron blocking layer may include any one or more of an aromatic amine electron blocking material, a dimethylfluorene electron blocking material, and a carbazole electron blocking material.

[0150] For example, the material of the electron blocking layer may include any one or more of 4,4'-bis[N-(1-naphthyl)-N-phenylamino]biphenyl (NPB), N,N'-bis(3-methylphenyl)-N,N'-diphenyl-[1,1'-biphenyl]-4,4'-diamine (TPD), 4-phenyl-4'-(9-phenylfluorene-9-yl)triphenylamine (BAFLP), 4,4'-bis[N-(9,9-dimethylfluorene-2-yl)-N-phenylamino]biphenyl (DFLDPBi), 4,4'-di(9-carbazolyl)biphenyl (CBP) and 9-phenyl-3-[4-(10-phenyl-9-anthracenyl)phenyl]-9H-carbazole (PCzPA).

[0151] In some embodiments of the present application, the light-emitting layer may include a red light-emitting material, a green light-emitting material, or a blue light-emitting material.

[0152] The red light-emitting material may include any one or more of a DCM-type red light-emitting material and a metal complex-type red light-emitting material.

[0153] For example, the red light-emitting material may include any one or more of 4-(dicyanomethylene)-2-methyl-6-(4-dimethylaminophenylvinyl)-4H-pyran (DCM), 4-(dicyanomethylene)-2-tert-butyl-6-(1,1,7,7-tetramethyljulolidine-9-enyl)-4H-pyran (DCJTB), bis(1-phenylisoquinoline)(acetylacetonate)iridium(III) (Ir(piq)2(acac)), octaethylporphyrin platinum (abbreviation: PtOEP), and bis(2-(2'-benzothienyl)pyridine-N,C3')(acetylacetonate)iridium (abbreviation: Ir(btp)2(acac).

[0154] The green light-emitting material may include any one or more of coumarin dyes, quinacridone copper derivatives, polycyclic aromatic hydrocarbons, diamine anthracene derivatives, carbazole derivatives, and metal complexes.

[0155] For example, the green light-emitting material may include any one or more of coumarin 6 (C-6), coumarin 545T (C-525T), quinacridone copper (QA), N,N'-dimethylquinacridone (DMQA), 5,12-diphenylnaphthonaphthone (DPT), N10,N10'-diphenyl-N10,N10'-diphthaloyl-9,9'-dianthracene-10,10'-diamine (abbreviated as: BA-NPB), tris(8-hydroxyquinoline)aluminum(III) (abbreviated as: Alq3), tris(2-phenylpyridine)iridium (Ir(ppy)3), and di(2-phenylpyridine)iridium acetylacetonate (Ir(ppy)2(acac)).

[0156] The blue light-emitting material may include any one or more of pyrene derivative blue light-emitting materials, anthracene derivative blue light-emitting materials, fluorene derivative blue light-emitting materials, perylene derivative blue light-emitting materials, styrylamine derivative blue light-emitting materials and metal complex blue light-emitting materials.

[0157] For example, the blue light-emitting material may include any one or more of N1,N6-di([1,1'-biphenyl]-2-yl)-N1,N6-di([1,1'-biphenyl]-4-yl)pyrene-1,6-diamine, 9,10-di-(2-naphthyl)anthracene (ADN), 2-methyl-9,10-di-2-naphthylanthracene (MADN), 2,5,8,11-tetra-tert-butylperylene (TBPe), 4,4'-di[4-(diphenylamino)phenylvinyl]biphenyl (BDAV Bi), 4,4'-di[4-(di-p-tolylamino)phenylvinyl]biphenyl (DPAVBi), and bis(4,6-difluorophenylpyridine-C2,N)picolinyliridium (FIrpic).

[0158] In some embodiments of the present application, the material of the hole blocking layer may include any one or more of benzimidazole derivative hole blocking materials, imidazopyridine derivative hole blocking materials, benzimidazolephenanthridine derivative hole blocking materials, pyrimidine derivative hole blocking materials, triazine derivative hole blocking materials, quinoline derivative hole blocking materials, isoquinoline derivative hole blocking materials, and phenanthroline derivative hole blocking materials.

[0159] For example, the hole blocking layer material may include any one or more of 2-(4-biphenylyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (PBD), 1,3-bis[5-(p-tert-butylphenyl)-1,3,4-oxadiazole-2-yl]benzene (OXD-7), 3-(4-tert-butylphenyl)-4-phenyl-5-(4-biphenylyl)-1,2,4-triazole (TAZ), 3-(4-tert-butylphenyl)-4-(4-ethylphenyl)-5-(4-biphenylyl)-1,2,4-triazole (p-EtTAZ), bathophenanthroline (BPhen), (BCP), and 4,4'-bis(5-methylbenzoxazol-2-yl)stilbene (BzOs).

[0160] In some embodiments of the present application, the material of the electron transport layer may include any one or more of benzimidazole derivative electron transport materials, imidazopyridine derivative electron transport materials, benzimidazolephenanthridine derivative electron transport materials, pyrimidine derivative electron transport materials, triazine derivative electron transport materials, quinoline derivative electron transport materials, isoquinoline derivative electron transport materials, and phenanthroline derivative electron transport materials.

[0161] For example, the material of the electron transport layer may include any one or more of 2-(4-biphenylyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (PBD), 1,3-bis[5-(p-tert-butylphenyl)-1,3,4-oxadiazole-2-yl]benzene (OXD-7), 3-(4-tert-butylphenyl)-4-phenyl-5-(4-biphenylyl)-1,2,4-triazole (TAZ), 3-(4-tert-butylphenyl)-4-(4-ethylphenyl)-5-(4-biphenylyl)-1,2,4-triazole (p-EtTAZ), bathophenanthroline (BPhen), (BCP), and 4,4'-bis(5-methylbenzoxazol-2-yl)stilbene (BzOs).

[0162] In some embodiments of the present application, the material of the electron injection layer may include any one or more of an alkali metal electron injection material and a metal electron injection material.

[0163] For example, the electron injection layer material may include any one or more of LiF, Yb, Mg, and Ca.

[0164] In some embodiments of the present application, the first electrode may include an anode, and the first electrode may be formed of a material having a high work function. For example, for a bottom-emitting device, the anode may be made of a transparent oxide material, such as indium tin oxide (ITO) or indium zinc oxide (IZO). Alternatively, for a top-emitting device, the anode may be made of a composite structure of metal and transparent oxide, such as Ag / ITO (Indium Tin Oxide), Ag / IZO (Indium Zinc Oxide), Al / ITO, Al / IZO or ITO / Ag / ITO, etc., to ensure good reflectivity.

[0165] In some embodiments of the present application, the second electrode may include a cathode, and the second electrode may be formed of a metal with a lower work function such as Al, Ag, Mg, or an alloy containing a low work function metal material.

[0166] In some embodiments of the present application, the display substrate may be an electroluminescent device, for example, an OLED or other device.

[0167] The display substrate of the embodiment of the present application can be obtained through a variety of manufacturing processes, which are illustrated below with examples.

[0168] In an exemplary embodiment, the display substrate may be manufactured by a fine mask evaporation process, which may include the following steps:

[0169] S1: depositing a material with high work function such as ITO, IZO or ZnO on the substrate 100 to form an anode;

[0170] S2: depositing an organic insulating material such as polyimide, benzocyclobutene resin, acrylate, etc. on the substrate 100 with the anode, and patterning the film layer formed by the organic insulating material to form a plurality of pixel definition layers 301 distributed at intervals;

[0171] S3: using a fine mask and a common mask to evaporate multiple light-emitting functional layers of the light-emitting device, to obtain a red light-emitting device 201 located in a red sub-pixel, a green light-emitting device 202 located in a green sub-pixel, and a blue light-emitting device 203 located in a blue sub-pixel; two adjacent light-emitting devices are separated by a pixel definition layer 301;

[0172] Among them, the functional layer prepared by the fine mask is patterned and deposited only in the pixel area, and the functional layer prepared by the ordinary mask is a common film layer, covering the pixel definition layer and the pixel area;

[0173] S4: On the surface of the substrate obtained in S3, a first encapsulation layer 401, a second encapsulation layer 402 and a third encapsulation layer 403 covering the light-emitting functional layer are sequentially deposited to obtain Figure 1 The display substrate is shown.

[0174] In an exemplary embodiment, the display substrate may be manufactured by a fine mask evaporation process and a photolithography process, which may include the following steps:

[0175] S10: depositing a material with high work function such as ITO, IZO or ZnO on the substrate 100 to form an anode;

[0176] S20: depositing an organic insulating material such as polyimide, benzocyclobutene resin, acrylate, etc. on the substrate 100 with the anode, and patterning the film layer formed by the organic insulating material to form a plurality of pixel definition layers 301 distributed at intervals;

[0177] S30: depositing an organic insulating material such as polyimide, benzocyclobutene resin, acrylate, etc. on the surface of the substrate obtained in S20 again to form an insulating layer covering each pixel definition layer 301; using a negative photosensitive material and a photomask, patterning the insulating layer through a photolithography process to form a first isolation structure 302 on each pixel definition layer 301, and the first isolation structure 302 can be an isolation column, for example, an inverted trapezoidal isolation column;

[0178] S40: using a fine mask and a common mask to evaporate multiple light-emitting functional layers of the light-emitting device, to obtain a red light-emitting device 201 located in a red sub-pixel, a green light-emitting device 202 located in a green sub-pixel, and a blue light-emitting device 203 located in a blue sub-pixel; two adjacent light-emitting devices are separated by a pixel definition layer 301 and a first isolation structure 302;

[0179] S50: On the surface of the substrate obtained in S30, a first encapsulation layer 401, a second encapsulation layer 402 and a third encapsulation layer 403 covering the light-emitting functional layer are sequentially deposited to obtain Figure 5 The display substrate is shown.

[0180] The design and manufacturing costs of fine masks are high. Photolithography technology can be used to reduce the use of fine masks and reduce costs.

[0181] In an exemplary embodiment, the display substrate may be manufactured by a photolithography process, which may include the following steps:

[0182] S100: depositing a material with high work function such as ITO, IZO or ZnO on the substrate 100 to form an anode;

[0183] S200: depositing an organic insulating material such as polyimide, benzocyclobutene resin, acrylate, etc. on the substrate 100 with the anode, and patterning the film layer formed by the organic insulating material to form a plurality of pixel definition layers 301 distributed at intervals;

[0184] S300: depositing a first conductive material and a second conductive material in sequence on the surface of the substrate obtained in S20, for example, conductive materials such as metal or conductive metal oxide, and under the same etching conditions, the etching rate of the second conductive material is lower than the etching rate of the first conductive material; then, etching the film layer formed by the first conductive material and the second conductive material using an etching agent to respectively form a first isolation structure 302 and a second isolation structure 303 located on the side of the pixel definition layer 301 away from the substrate, wherein the first isolation structure 302 may be a columnar isolation column, and the second isolation structure 303 may be a layered isolation layer; wherein the orthographic projection of the first isolation structure 302 on the substrate 100 falls within the range of the orthographic projection of the second isolation structure 303 on the substrate 100; by using conductive materials to form the first isolation structure 302 and the second isolation structure 303, the anode can be led out of the light-emitting device;

[0185] S400: without using a fine mask, depositing a red light-emitting functional layer and a cathode layer included in the red light-emitting device on the substrate obtained in S300, and forming a first encapsulation layer 401 on the cathode by a chemical vapor deposition process; wherein the cathode and the first encapsulation layer 401 simultaneously cover the red sub-pixel, the green sub-pixel, the blue sub-pixel, each pixel definition layer 301, each second isolation structure 302 and each third isolation structure 303; depositing a negative photoresist in the area corresponding to the red sub-pixel, etching and removing the red light-emitting functional layer, the cathode layer, and the first encapsulation layer on the remaining area, and only retaining the red light-emitting functional layer, the cathode layer, and the first encapsulation layer 401 of the red sub-pixel, thereby completing the preparation and encapsulation of the red light-emitting device;

[0186] This step independently packages the red light-emitting device, thereby preventing the red light-emitting device from being affected by the subsequent photolithography process;

[0187] S500: Referring to step S400, the preparation and packaging of the green light emitting device in the green sub-pixel is completed, and the preparation and packaging of the blue light emitting device in the blue sub-pixel is completed; Figure 6 As shown, the first encapsulation layers 401 of the three sub-pixels are connected together to form a continuous first encapsulation layer 401;

[0188] S600: forming a second encapsulation layer 402 covering the first encapsulation layer 401, the second isolation structure 302 and the third isolation structure 303 on the surface of the substrate obtained in S500 through an inkjet printing process;

[0189] S700: Depositing a third encapsulation layer 403 on the second encapsulation layer 402 to obtain Figure 6 The display substrate is shown.

[0190] The embodiment of the present application further provides a display device, which includes the display substrate described in the embodiment of the present application.

[0191] In some embodiments of the present application, the display device can be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, a navigator, a car display, a smart watch, a smart bracelet, etc.

[0192] The advantages of the display substrate of the embodiment of the present application are explained below through specific device embodiments.

[0193] The structural formulas of some of the raw materials used are shown below.

[0194]

[0195]

[0196] Device structure and thickness

[0197] The device of the embodiment of the present application:

[0198] ITO / m-MTDATA:F4TCNQ 3%10nm / m-MTDATA 100nm / BEBL 5nm / BH:BD 5%20nm / TPBI 5nm / BCP:Liq 1:1 30nm / Yb 1nm / Mg:Ag 13nm / CP1 65nm / CP2 85nm

[0199] ITO / m-MTDATA:F4TCNQ 3%10nm / m-MTDATA 100nm / GEBL 30nm / GH:GD 10%35nm / TPBI 5nm / BCP:Liq 1:1 30nm / Yb 1nm / Mg:Ag 13nm / CP1 65nm / CP2 85nm

[0200] ITO / m-MTDATA:F4TCNQ 3%10nm / m-MTDATA 100nm / REBL 80nm / RH:RD 3%45nm / TPBI 5nm / BCP:Liq 1:1 30nm / Yb 1nm / Mg:Ag 13nm / CP1 65nm / CP2 85nm

[0201] Comparison Devices

[0202] The only difference from the device in the embodiment of the present application is that LiF is used to replace CP2.

[0203] The devices in the embodiments of the present application and the comparative devices are both packaged using TFE.

[0204] Figure 7 A scanning electron microscope image of an exemplary device in the embodiment of the present application in the horizontal direction; Figure 8 for Figure 7 Scanning electron microscope image of the device in the vertical direction; Fig. 9 This is a scanning electron microscope image of the comparative device of the present application in the horizontal direction; Fig.10 for Fig. 9 Scanning electron microscope image of the device in the vertical direction.

[0205] The slope angles θ of the devices of the present application embodiment and the comparative devices are shown in Tables 1 and Figures 7 to 10 shown.

[0206] Table 1

[0207] θ(horizon) θ(vertical) θ(horizontal)-θ(vertical) Comparison Devices CP1 / LiF 73° 89° 16° The device of the present application embodiment CP1 / CP2 113° 115° 2°

[0208] Fig.11 This is a schematic diagram of the change of color shift of an exemplary device according to an embodiment of the present application with respect to angle; Fig.12 Schematic diagram of the color shift of the comparative device of the present application changing with the angle.

[0209] The color deviation of the device of the embodiment and the comparative device is shown in Table 2 and Figure 11 to Figure 12 shown.

[0210] Table 2

[0211]

[0212]

[0213] It can be seen that, whether in the horizontal direction or in the vertical direction, at the same angle, the color deviation of the device in the embodiment of the present application is significantly smaller than the color deviation of the comparison device; and the absolute value of the color deviation value of the device in the embodiment of the present application at different angles in the horizontal and vertical directions is significantly smaller, indicating that the color deviation of the device in the embodiment of the present application at different angles in the horizontal and vertical directions is closer.

[0214] Although the embodiments disclosed in this application are as above, the contents described are only embodiments adopted to facilitate understanding of this application and are not intended to limit this application. Any technician in the field to which this application belongs can make any modifications and changes in the form and details of implementation without departing from the spirit and scope disclosed in this application, but the scope of protection of this application shall still be based on the scope defined in the attached claims.

Claims

1. A display substrate, characterized in that: include: A plurality of light-emitting devices are spaced apart in different sub-pixel regions, and adjacent light-emitting devices are spaced apart by a pixel definition layer; the light-emitting device comprises a first electrode, a light-emitting function layer, and a second electrode which are sequentially arranged on the substrate in a direction away from the substrate; the light-emitting function layer extends to a surface of the pixel definition layer away from the substrate; in the process of the light-emitting function layer extending from the first electrode to the pixel definition layer, the thickness of the light-emitting function layer changes; the light-emitting function layer is a curved surface in a region corresponding to a contact position between the pixel definition layer and the first electrode, and the slope angle of the curved surface is θ; When the display substrate displays white light at 255 grayscale, each of the light-emitting devices satisfies the following formula: |Δu′v′(horizon)-Δu′v′(vertical)| / 0.004≤1 (1) θ(horizon)-θ(vertical)≤10° (2) Wherein, θ is the angle between the straight line BC and the straight line BD, B is the intersection of the pixel definition layer and the first electrode, C is the starting point where the thickness of the light-emitting functional layer changes, and D is the end point where the thickness of the light-emitting functional layer changes; points B, C, and D are selected on the same cross section perpendicular to the substrate; |Δu′v′(horizon)-Δu′v′(vertical)| / 0.004 is the absolute value of the color deviation in the horizontal and vertical directions; u′ n and v′ n are the color coordinates at different viewing angles, u′0 and v′0 are the color coordinates at a viewing angle of 0°; different viewing angles refer to the range of -75° to 75°, with each 5° interval from 0° as one viewing angle; θ (horizon) is the slope angle of the curved surface in the horizontal direction, and θ (vertical) is the slope angle of the curved surface in the vertical direction.

2. The display substrate according to claim 1, characterized in that: Points C and D satisfy: LC = 101.3% L; LD = 101.3% L; Wherein, L is the thickness of the light-emitting functional layer located between the first electrode and the second electrode; LC is the thickness of the light-emitting functional layer at point C; and LD is the thickness of the light-emitting functional layer at point D.

3. The display substrate according to claim 1, characterized in that: The light emitting device further comprises at least two covering layers stacked on the second electrode in a direction away from the substrate, and the refractive index of the covering layers decreases in sequence in the direction away from the substrate.

4. The display substrate according to claim 3, characterized in that: The refractive index difference between two adjacent covering layers is greater than 0.

3.

5. The display substrate according to claim 4, characterized in that: The light emitting device comprises a first covering layer and a second covering layer which are sequentially stacked in a direction away from the substrate, wherein the refractive index of the first covering layer in the visible light band is greater than 1.75, and the refractive index of the second covering layer in the visible light band is less than 1.

7.

6. The display substrate according to claim 5, characterized in that: The thickness of the first covering layer is L1, and the thickness of the second covering layer is L2; ​​L1 and L2 satisfy: 0.7L1≤L2≤1.3L1.

7. The display substrate according to claim 6, characterized in that: The thickness of the first capping layer is 600 angstroms to 800 angstroms.

8. The display substrate according to claim 6, characterized in that: The plurality of light-emitting devices include red light-emitting devices, green light-emitting devices, and blue light-emitting devices that are distributed at intervals; the thickness of the light-emitting functional layer of the red light-emitting device located between the first electrode and the second electrode is LR, the thickness of the light-emitting functional layer of the green light-emitting device located between the first electrode and the second electrode is LG, and the thickness of the light-emitting functional layer of the blue light-emitting device located between the first electrode and the second electrode is LB; L1 and L2 satisfy at least one of the following conditions: a) 1.5≤LR / (L1+L2)≤2; b)1≤LG / (L1+L2)≤1.6; c)0.7≤LB / (L1+L2)≤1.

4.

9. The display substrate according to any one of claims 5 to 8, characterized in that: The first covering layer comprises at least one of the materials having the following general formula: Wherein, Ar1 to Ar3 are each independently hydrogen, deuterium, nitrile, nitro, hydroxyl, carbonyl, ester, imide, amide, substituted or unsubstituted C1-C30 alkyl, substituted or unsubstituted C3-C30 cycloalkyl, substituted or unsubstituted C1-C30 alkoxy, substituted or unsubstituted C5-C30 aryloxy, substituted or unsubstituted C1-C30 alkylthio, arylthio, substituted or unsubstituted C1-C30 alkylsulfonyl, arylsulfonyl, alkenyl, silanyl, boronyl, amine, arylphosphino, phosphine oxide, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C5-C30 heteroaryl or a group represented by the general formula II; herein, substituted C1-C30 alkyl, substituted C3-C30 cycloalkyl, substituted C1-C30 alkoxy, substituted C5-C30 aryloxy, substituted or unsubstituted C1-C30 alkylthio, arylthio, substituted or unsubstituted C1-C30 alkylsulfonyl, arylsulfonyl, alkenyl, silanyl, boronyl, amine, arylphosphino, phosphine oxide, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C5-C30 heteroaryl or a group represented by the general formula II; C5-C30 aryloxy, substituted C1-C30 alkylthio, substituted C1-C30 alkylsulfonyl, substituted C6-C30 aryl, substituted C5-C30 heteroaryl refer to substituted by one or more of the following groups: deuterium, nitrile, nitro, hydroxyl, carbonyl, ester, imide, amide, C1-C30 alkyl, C3-C30 cycloalkyl, C1-C30 alkoxy, C5-C30 aryloxy, C1-C30 alkylthio, arylthio, C1-C30 alkylsulfonyl, arylsulfonyl, alkenyl, silanyl, boronyl, amine, arylphosphino, phosphine oxide, C6-C30 aryl, C5-C30 heteroaryl; wherein the substituents on two adjacent Cs are optionally combined with each other to form a ring; and at least one of Ar1 to Ar3 is a group shown in general formula II; X is S or O; L is a substituted or unsubstituted C6-C30 arylene group or a substituted or unsubstituted C5-C30 heteroarylene group; herein, the substituted C6-C30 arylene group and the substituted C5-C30 heteroarylene group refer to groups substituted by one or more of the following groups: deuterium, nitrile, nitro, hydroxyl, carbonyl, ester, imido, amide, C1-C30 alkyl, C3-C30 cycloalkyl, C1-C30 alkoxy, C5-C30 aryloxy, C1-C30 alkylthio, arylthio, C1-C30 alkylsulfonyl, arylsulfonyl, alkenyl, silanyl, boronyl, amine, arylphosphino, phosphine oxide, C6-C30 aryl, or C5-C30 heteroaryl.

10. The display substrate according to claim 9, characterized in that: Any one or two of Ar1 to Ar3 are selected from the following groups:

11. The display substrate according to claim 9, characterized in that: L in the general formula II is selected from the following groups:

12. The display substrate according to any one of claims 5 to 8, characterized in that: The material of the second covering layer contains any one or more of the following groups: a cycloalkyl group containing a non-conjugated segment, an adamantane group containing a non-conjugated segment, an amine group containing a non-conjugated segment, an ester group containing a non-conjugated segment, a nitro group, a sulfonic acid group, a phosphorus oxygen group, a halogen group and a cyano group.

13. The display substrate according to claim 12, characterized in that: The second cover layer comprises a material having the following general formula: Wherein, Ar4 and Ar5 are each independently hydrogen, halogen, nitro, nitrile, substituted or unsubstituted amide, substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C5-C30 heteroaryl, substituted or unsubstituted C1-C30 alkyl, substituted or unsubstituted heteroalkyl, substituted or unsubstituted C1-C30 alkoxy, substituted or unsubstituted thioether, substituted or unsubstituted silyl, substituted or unsubstituted phosphoryl; Here, substituted amide, substituted aryl, substituted heteroaryl, substituted alkyl, substituted heteroalkyl, substituted alkoxy, substituted thioether Ether, substituted silyl, substituted phosphorus oxygen refers to substitution by one or more of the following groups: deuterium, nitrile, nitro, hydroxyl, carbonyl, ester, imide, amide, C1-C30 alkyl, C3-C30 cycloalkyl, C1-C30 alkoxy, C5-C30 aryloxy, C1-C30 alkylthio, arylthio, C1-C30 alkylsulfonyl, arylsulfonyl, alkenyl, silanyl, boronyl, amine, arylphosphino, phosphine oxide, C6-C30 aryl, C5-C30 heteroaryl; wherein the substituents on two adjacent C groups are optionally combined with each other to form a ring; L1 and L2 are each independently a substituted or unsubstituted C6-C30 arylene group or a substituted or unsubstituted C5-C30 heteroarylene group; herein, the substituted C6-C30 arylene group and the substituted C5-C30 heteroarylene group refer to groups substituted by one or more of the following groups: deuterium, nitrile, nitro, hydroxyl, carbonyl, ester, imido, amide, C1-C30 alkyl, C3-C30 cycloalkyl, C1-C30 alkoxy, C5-C30 aryloxy, C1-C30 alkylthio, arylthio, C1-C30 alkylsulfonyl, arylsulfonyl, alkenyl, silanyl, boron, amine, arylphosphino, phosphine oxide, C6-C30 aryl, or C5-C30 heteroaryl.

14. The display substrate according to any one of claims 1 to 8, characterized in that: Also included are isolation columns, the isolation columns are located on a side of the pixel definition layer away from the substrate, and the isolation columns are configured to separate the common film layer between the plurality of light-emitting devices; The height of the isolation column is ≤2 microns.

15. The display substrate according to any one of claims 1 to 8, characterized in that: The light-emitting functional layer includes: a hole injection layer, a hole transport layer, an electron blocking layer, a light-emitting layer, a hole blocking layer, an electron transport layer and an electron injection layer.

16. The display substrate according to claim 15, characterized in that: The material of the hole injection layer includes a transition metal oxide; or the material of the hole injection layer includes a hole transport material and a p-type dopant; The transition metal oxide includes any one or more of molybdenum oxide, titanium oxide, vanadium oxide, rhenium oxide, ruthenium oxide, chromium oxide, zirconium oxide, hafnium oxide, tantalum oxide, silver oxide, tungsten oxide, and manganese oxide; The p-type dopant includes any one or more of 2,3,6,7,10,11-hexacyano-1,4,5,8,9,12-hexaazatriphenylene, 2,3,5,6-tetrafluoro-7,7',8,8'-tetracyano-p-benzoquinone, and 1,2,3-tris[(cyano)(4-cyano-2,3,5,6-tetrafluorophenyl)methylene]cyclopropane; The hole transport material includes any one or more of an aromatic amine hole transport material, a dimethylfluorene hole transport material, and a carbazole hole transport material.

17. The display substrate according to claim 15, characterized in that: The material of the hole transport layer includes any one or more of aromatic amine hole transport materials, dimethylfluorene hole transport materials, and carbazole hole transport materials.

18. The display substrate according to claim 15, characterized in that: The material of the electron blocking layer includes any one or more of an aromatic amine electron blocking material, a dimethylfluorene electron blocking material, and a carbazole electron blocking material.

19. The display substrate according to claim 15, characterized in that: The light-emitting layer includes a red light-emitting material, a green light-emitting material or a blue light-emitting material; The red luminescent material includes any one or more of a DCM type red luminescent material and a metal complex type red luminescent material; The green luminescent material includes any one or more of coumarin dyes, quinacridone copper derivatives green luminescent materials, polycyclic aromatic hydrocarbons green luminescent materials, diamine anthracene derivatives green luminescent materials, carbazole derivatives green luminescent materials and metal complex green luminescent materials; The blue light-emitting material includes any one or more of pyrene derivative blue light-emitting materials, anthracene derivative blue light-emitting materials, fluorene derivative blue light-emitting materials, perylene derivative blue light-emitting materials, styrylamine derivative blue light-emitting materials and metal complex blue light-emitting materials.

20. The display substrate according to claim 15, characterized in that: The material of the hole blocking layer includes any one or more of benzimidazole derivative hole blocking materials, imidazopyridine derivative hole blocking materials, benzimidazolephenanthridine derivative hole blocking materials, pyrimidine derivative hole blocking materials, triazine derivative hole blocking materials, quinoline derivative hole blocking materials, isoquinoline derivative hole blocking materials, and phenanthroline derivative hole blocking materials.

21. The display substrate according to claim 15, characterized in that: The material of the electron transport layer includes any one or more of benzimidazole derivative electron transport materials, imidazopyridine derivative electron transport materials, benzimidazolephenanthridine derivative electron transport materials, pyrimidine derivative electron transport materials, triazine derivative electron transport materials, quinoline derivative electron transport materials, isoquinoline derivative electron transport materials, and phenanthroline derivative electron transport materials.

22. The display substrate according to claim 15, characterized in that: The material of the electron injection layer includes any one or more of an alkali metal electron injection material and a metal electron injection material.

23. A display device, characterized in that: Comprising the display substrate according to any one of claims 1 to 22.

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