Display panel, manufacturing method thereof and display device

Abstract

The invention provides a display panel, a manufacturing method thereof and a display device.According to the display panel, a driving function layer, a first electrode layer, a light-emitting function layer and a second electrode layer are sequentially formed on a substrate, and light extraction layers are formed on the portion, away from the light-emitting function layer, of the second electrode layer; the first non-planar structure is formed on the side, away from the second electrode layer, of the light extraction layer, so that the first non-planar structure can change the angle of light emitted by the light-emitting functional layer, and total reflection of light can be reduced; the packaging layer is formed on the side, away from the second electrode layer, of the light extraction layer, the second non-planar structure is formed on the side, away from the light extraction layer, of the packaging layer, and the first non-planar structure and the second non-planar structure are different in morphology, so that on the basis that the first non-planar structure changes the angle of emergent light, the light extraction efficiency is improved. The second non-planar structure further refracts the light which may be totally reflected, so that the refracted light is increased, and the light emitting rate of the display panel is further improved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display panel and a manufacturing method thereof, and a display device. Background Art

[0002] Organic Light-Emitting Diode (OLED), as a new type of light-emitting device, has great application potential in the field of display and lighting, and has therefore attracted strong attention from academia and industry. In the display field, organic light-emitting diodes have the advantages of self-luminescence, fast response, wide viewing angle, high brightness, bright colors, and light weight compared to liquid crystal display panels (LCDs), and are considered to be the next generation of display technology. In related technologies, due to the total reflection effect of OLED display panels, the light output efficiency of OLED display panels is low. Summary of the invention

[0003] In view of this, the purpose of the present application is to provide a display panel and a manufacturing method thereof, and a display device to solve part or all of the technical problems in the background technology.

[0004] Based on the above purpose, the present application provides a display panel, including:

[0005] substrate substrate;

[0006] A driving function layer is arranged on the base substrate;

[0007] A first electrode layer is arranged on a side of the driving function layer away from the substrate;

[0008] A light-emitting functional layer is arranged on a side of the first electrode layer away from the base substrate;

[0009] A second electrode layer is arranged on a side of the light-emitting functional layer away from the first electrode layer;

[0010] A light extraction layer is arranged on a side of the second electrode layer away from the light-emitting functional layer, and the side of the light extraction layer away from the second electrode layer is a first non-planar structure;

[0011] An encapsulation layer is arranged on a side of the light extraction layer away from the second electrode layer, and a side of the encapsulation layer away from the light extraction layer is a second non-planar structure;

[0012] The first non-planar structure and the second non-planar structure have different morphologies.

[0013] Optionally, the first non-planar structure and the second non-planar structure are in a concave-convex shape, and the concave-convex shape of the first non-planar structure and the concave-convex shape of the second non-planar structure have at least one of the following relationships:

[0014] The orthographic projections of the plurality of recesses of the first non-planar structure and the plurality of recesses of the second non-planar structure on the substrate only partially overlap or do not overlap;

[0015] The orthographic projections of the plurality of convex portions of the first non-planar structure and the plurality of convex portions of the second non-planar structure on the substrate only partially overlap or do not overlap;

[0016] The plurality of recesses of the first non-planar structure have different depths than the plurality of recesses of the second non-planar structure;

[0017] The heights of the plurality of protrusions of the first non-planar structure and the plurality of protrusions of the second non-planar structure are different;

[0018] The plurality of recesses of the first non-planar structure have different cross-sectional shapes from the plurality of recesses of the second non-planar structure;

[0019] The cross-sectional shapes of the plurality of protrusions of the first non-planar structure and the plurality of protrusions of the second non-planar structure are different.

[0020] Optionally, the thickness of the light extraction layer is greater than 40 nm.

[0021] Optionally, the light extraction layer includes a first material and a second material, the first material and the second material are thermal expansion materials, and a thermal expansion coefficient of the first material is greater than a thermal expansion coefficient of the second material.

[0022] Optionally, the ratio of the first material to the second material is 1:1; and / or

[0023] The first material includes an organic material, and the second material includes a metal or an organic metal complex.

[0024] Optionally, the first material includes N,N'-diphenyl-N,N'-(1-naphthyl)-1,1'-biphenyl-4,4'-diamine, the second material includes 8-hydroxyquinoline aluminum, and the encapsulation layer includes silicon oxide.

[0025] Optionally, the encapsulation layer has a thickness greater than 0.5 μm.

[0026] Based on the same inventive concept, the present application also provides a method for manufacturing a display panel, comprising:

[0027] A driving function layer, a first electrode layer, a light emitting function layer and a second electrode layer are sequentially formed on the base substrate;

[0028] Forming a light extraction layer on a side of the second electrode layer away from the light-emitting functional layer, and forming a first non-planar structure on a side of the light extraction layer away from the second electrode layer;

[0029] An encapsulation layer is formed on a side of the light extraction layer away from the second electrode layer, and a second non-planar structure is formed on a side of the encapsulation layer away from the light extraction layer, wherein the first non-planar structure and the second non-planar structure have different morphologies.

[0030] Optionally, a light extraction layer is formed on a side of the second electrode layer away from the light-emitting functional layer, and a first non-planar structure is formed on a side of the light extraction layer away from the second electrode layer, including:

[0031] The first material and the second material are evaporated on the second electrode layer in a preset ratio to form the light extraction layer, and the light extraction layer is heated according to a preset temperature and a preset heating time to form the first non-planar structure on the side of the light extraction layer away from the second electrode layer.

[0032] Optionally, the preset ratio is 1:1; and / or the preset temperature is 90° C.; and / or the preset heating time is greater than or equal to 20 min.

[0033] Optionally, a second non-planar structure is formed on a side of the encapsulation layer away from the light extraction layer, comprising:

[0034] The encapsulation layer is bombarded by a plasma bombardment method, so that the second non-planar structure is formed on a side of the encapsulation layer away from the light extraction layer.

[0035] Based on the same inventive concept, the present application also provides a display device, comprising a display panel as claimed in any of the above claims.

[0036] From the above description, it can be seen that the present application provides a display panel and its manufacturing method, and a display device, the display panel comprising: a substrate, a driving function layer, a first electrode layer, a second electrode layer, a light-emitting function layer, a second electrode layer, a light extraction layer and a packaging layer, by sequentially forming the driving function layer, the first electrode layer, the light-emitting function layer and the second electrode layer on the substrate, forming a light extraction layer on some of the second electrode layer away from the light-emitting function layer, and forming a first non-planar structure on a side of the light extraction layer away from the second electrode layer, so that the first non-planar structure can change the angle of light emitted from the light-emitting function layer, thereby reducing the total reflection of light; forming a packaging structure on a side of the light extraction layer away from the second electrode layer, and forming a second non-planar structure on a side of the packaging layer away from the light extraction layer, and the first non-planar structure and the second non-planar structure have different morphologies, so that, on the basis of the first non-planar structure changing the angle of the emitted light, part of the light that may be totally reflected is further refracted by the second non-planar structure, thereby increasing the refracted light, and further improving the light output rate of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the present application or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 A diagram showing the transmission path of light in the light extraction layer and the packaging layer in an example.

[0039] Figure 2 A cross-sectional structure diagram of a display panel in an embodiment of the present application is shown in FIG.

[0040] Figure 3 A schematic diagram of a cross-sectional structure of a display panel according to another embodiment of the present application is shown.

[0041] Figure 4 A schematic diagram of a cross-sectional structure of another display panel according to another embodiment of the present application is shown.

[0042] Figure 5 A partial cross-sectional structural schematic diagram of a display panel according to another embodiment of the present application is shown.

[0043] Figure 6 A partial cross-sectional structural schematic diagram of another display panel according to another embodiment of the present application is shown.

[0044] Figure 7 A partial cross-sectional structural schematic diagram of a display panel according to another embodiment of the present application is shown.

[0045] Figure 8 A flow chart of a display panel manufacturing method according to an embodiment of the present application is shown.

[0046] Fig. 9 A simplified structural diagram of a display device provided in one embodiment of the present application.

[0047] Fig.10 A schematic diagram of the hardware structure of an electronic device provided by this embodiment is shown. DETAILED DESCRIPTION

[0048] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0049] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be the usual meanings understood by people with ordinary skills in the field to which the present application belongs. The "first", "second" and similar words used in the embodiments of the present application do not represent any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0050] In related technologies, in order to improve the light extraction efficiency of the display panel 01, a light extraction layer 02CPL with a high refractive index is usually provided in the display panel 01, which can improve the performance of the light-emitting device. However, the light emitted by the light-emitting device is absorbed by the film layer or affected by the total reflection of the interface during the transmission process, resulting in part of the light being unable to be emitted, thereby limiting the light extraction efficiency.

[0051] Figure 1 FIG. 1 shows a transmission path diagram of light in the light extraction layer 02 and the encapsulation layer 03 in an example. Figure 1 As shown, the direction perpendicular to the display panel 01 is 0°, the direction parallel to the display panel 01 is 90°, and 0° to 45° is a small angle, and 45° to 90° is a large angle. Figure 1It can be seen that light ① is emitted at 0°, and light ② is emitted at a small angle. The light emitted at 0° and the light emitted at a small angle can be directly emitted to the outside of the display panel 01, and this part of light is effective light. Light ③ is emitted at a large angle. Since the refractive index of the light extraction layer 02CPL is greater than the refractive index of the encapsulation layer 03, when the light is transmitted from the optically dense medium to the optically sparse medium, the light will be totally reflected when it is greater than the critical angle. In other words, there are some lights that cannot be emitted among the lights emitted at a large angle, which limits the light extraction efficiency.

[0052] Figure 2 A cross-sectional structure diagram of a display panel in an embodiment of the present application is shown in FIG.

[0053] like Figure 2 As shown, the present application provides a display panel, comprising:

[0054] Base substrate 1;

[0055] A driving function layer 2 is arranged on the base substrate 1;

[0056] A first electrode layer 3, arranged on a side of the driving function layer 2 away from the base substrate 1;

[0057] A light-emitting functional layer 4 is arranged on a side of the first electrode layer 3 away from the base substrate 1;

[0058] A second electrode layer 5 is arranged on a side of the light-emitting functional layer 4 away from the first electrode layer 3;

[0059] A light extraction layer 6 is provided on a side of the second electrode layer 5 away from the light-emitting functional layer 4, and a side of the light extraction layer 6 away from the second electrode layer 5 is a first non-planar structure 61;

[0060] The encapsulation layer 7 is arranged on a side of the light extraction layer 6 away from the second electrode layer 5, and the side of the encapsulation layer 7 away from the light extraction layer 6 is a second non-planar structure 71;

[0061] The first non-planar structure 61 and the second non-planar structure 71 have different morphologies.

[0062] In this embodiment, the driving function layer 2 is arranged on the base substrate 1, and the light-emitting unit is arranged on the side of the driving function layer 2 away from the base substrate 1, wherein the driving function layer 2 includes a pixel circuit or a pixel driving circuit manufactured on the base substrate 1, and is used to provide a driving electrical signal for the light-emitting unit composed of the first electrode layer 3, the light-emitting function layer 4, and the second electrode layer 5. The light-emitting unit is used to realize the display of the display panel; the first electrode layer 3, the light-emitting function layer 4, and the second electrode layer 5 of the light-emitting unit are stacked and arranged on the side of the driving function layer 2 away from the base substrate 1, the first electrode layer 3 is arranged on the side of the driving function layer 2 away from the base substrate 1, and the second electrode layer 5 is arranged on the side of the light-emitting function layer 4 away from the first electrode layer 3. Wherein, exemplarily, the first electrode layer 3 can be the anode of the light-emitting unit, the second electrode layer 5 can be the cathode of the light-emitting unit, and the light-emitting function layer 4 emits light under the control of the electrical signal provided by the first electrode layer 3 and the second electrode layer 5, thereby realizing the display of the display panel. Optionally, the light-emitting function layer 4 can further include a light-emitting layer, an electron transport layer, a hole transport layer, etc., and the specific hierarchical structure can be set as needed. The light extraction layer 6 and the encapsulation layer 7 are arranged in the light emitting direction of the light emitting unit. The light extraction layer 6 is used to provide the light extraction rate of the light emitting unit, and the encapsulation layer 7 is used to realize the wrapping protection of the display panel as a whole, especially to prevent the corrosion of the device caused by water and oxygen. The light extraction layer 6 is arranged in the light emitting direction of the second electrode layer 5, and is set as a first non-planar structure 61 on the side away from the second electrode layer 5. The encapsulation layer 7 is arranged in the light emitting direction of the light extraction layer 6, and is set as a second non-planar structure 71 on the side away from the light extraction layer 6, wherein the first non-planar structure 61 and the second non-planar structure 71 have different morphologies, such as Figure 2 As shown, the direction perpendicular to the substrate 1 is 0°, the direction parallel to the substrate 1 is 90°, and 0° to 45° is a small angle, and 45° to 90° is a large angle. Figure 2 It can be seen that light ④ is a light emitted at 0°, light ⑤ is a light emitted at a small angle, and light ⑥ is a light emitted at a large angle. The light emitted from the light-emitting unit at 0°, 0° to 45° as a small angle, and 45° to 90° as a large angle are sequentially irradiated on the first non-planar structure 61 and the second non-planar structure 71. Due to the stacking arrangement of the first non-planar structure 61 and the second non-planar structure 71, the light emitted at each angle can be emitted to the outside of the display panel, which increases the refractive index of the light, reduces the total reflected light, and thus improves the light output rate of the display panel.

[0063] Furthermore, the light-emitting functional layer 4 can be a multi-layer structure, and the light-emitting functional layer 4 can include a light-emitting material layer, and can further include at least one of a hole injection layer, a hole transport layer, an electron blocking layer, a hole blocking layer, an electron transport layer and an electron injection layer, wherein the hole injection layer, the hole transport layer and the electron blocking layer are located between the anode and the light-emitting material layer, and the hole blocking layer, the electron transport layer and the electron injection layer are located between the light-emitting material layer and the cathode.

[0064] The material used for the anode can be metal, metal oxide or conductive polymer; wherein the metal includes copper, gold, silver, iron, chromium, nickel, manganese, palladium, platinum and their alloys, the metal oxide includes indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide, indium gallium zinc oxide (IGZO) and the like, and the conductive polymer includes polyaniline, polypyrrole, poly (3-methylthiophene) and the like. In addition to the above materials and combinations thereof that facilitate hole injection, known materials suitable for the anode are also included.

[0065] The cathode may be made of metal or multi-layer metal materials; metals include aluminum, magnesium, silver, indium, tin, titanium, etc. and their alloys, and multi-layer metal materials include LiF / Al, LiO2 / Al, BaF2 / Al, etc. In addition to the above materials and combinations thereof that facilitate electron injection, known materials suitable for the cathode are also included.

[0066] Figure 3 A schematic diagram of a cross-sectional structure of a display panel according to another embodiment of the present application is shown.

[0067] Figure 4 A schematic diagram of a cross-sectional structure of another display panel according to another embodiment of the present application is shown.

[0068] In some embodiments, the first non-planar structure 61 and the second non-planar structure 71 are in a concave-convex shape, and the concave-convex shape of the first non-planar structure 61 and the concave-convex shape of the second non-planar structure 71 have at least one of the following relationships:

[0069] The orthographic projections of the multiple recesses of the first non-planar structure 61 and the multiple recesses of the second non-planar structure 71 on the base substrate 1 only partially overlap or do not overlap at all;

[0070] The orthographic projections of the plurality of convex portions of the first non-planar structure 61 and the plurality of convex portions of the second non-planar structure 71 on the base substrate 1 only partially overlap or do not overlap at all.

[0071] For example, Figure 4As shown, the side of the light extraction layer 6 away from the second electrode layer 5 is a first non-planar structure 61, which is a first wave structure, and the spacing between the waves of the first wave structure is different. The encapsulation layer 7 away from the light extraction layer 6 is a second non-planar structure 71, which is a second wave structure, and the spacing between the waves of the second wave structure is different. The first wave structure and the second wave structure have different wave amplitudes. Figure 4 In the portion a01, the orthographic projections of the plurality of concave portions of the first non-planar structure 61 and the plurality of concave portions of the second non-planar structure 71 on the base substrate 1 overlap. Figure 4 In the a02 portion, the orthographic projections of the plurality of convex portions of the first non-planar structure 61 and the plurality of convex portions of the second non-planar structure 71 on the base substrate 1 overlap. Figure 3 As shown, the first non-planar structure 61 is a first wave structure, and the second non-planar structure 71 is a second wave structure. Figure 3 It can be seen that the first wave structure and the second wave structure are symmetrically arranged, from which it can be known that the multiple concave portions of the first non-planar structure 61 do not overlap with the multiple concave portions of the second non-planar structure 71, which can be understood as the multiple concave portions of the first non-planar structure 61 and the multiple concave portions of the second non-planar structure 71 are staggered. The multiple convex portions of the first non-planar structure 61 and the multiple convex portions of the second non-planar structure 71 do not overlap, which can be understood as the multiple convex portions of the first non-planar structure 61 and the multiple convex portions of the second non-planar structure 71 are staggered. In this way, the concave and convex portions of the first non-planar structure 61 and the second non-planar structure 71 are staggered. When the light-emitting functional layer 4 emits light to the first non-planar structure 61, reflected light may be generated in the first non-planar structure 61 due to the concave-convex structure, and then the reflected light can be further refracted through the second non-planar structure 71, thereby increasing the refracted light and improving the light output efficiency of the display panel.

[0072] Figure 5 A partial cross-sectional structure schematic diagram of a display panel according to another embodiment of the present application is shown.

[0073] Figure 6 A partial cross-sectional structural schematic diagram of another display panel according to another embodiment of the present application is shown.

[0074] In some embodiments, Figure 5 and Figure 6 As shown, the first non-planar structure 61 and the second non-planar structure 71 are in a concave-convex shape, and the concave-convex shape of the first non-planar structure 61 and the concave-convex shape of the second non-planar structure 71 have at least one of the following relationships:

[0075] The depths of the plurality of recesses of the first non-planar structure 61 and the plurality of recesses of the second non-planar structure 71 are different;

[0076] The heights of the plurality of protrusions of the first non-planar structure 61 and the plurality of protrusions of the second non-planar structure 71 are different.

[0077] For example, Figure 5 As shown, the first non-planar structure 61 and the second non-planar structure 71 are both triangular wave structures, which means that the cross-sectional shape of the concave and convex parts of the first non-planar structure 61 and the second non-planar structure 71 is a triangle. Figure 5 As shown, the wave structures of the first non-planar structure 61 and the second non-planar structure 71 can be arranged in an equidistant array. In addition, as shown in FIG. Figure 6 As shown, the wave structures of the first non-planar structure 61 and the second non-planar structure 71 are different, that is, the first non-planar structure 61 and the second non-planar structure 71 are arranged in an irregular wave structure. In order to illustrate the specific structure of this embodiment, this embodiment uses the wave structure arranged in an equidistant array as an example. The depths of the concave and convex parts of the first non-planar structure 61 are consistent. The depths of the concave and convex parts of the second non-planar structure 71 are consistent. Figure 5 a2 in the figure is marked as the depth of the concave portion of the first non-planar structure 61, and a1 is marked as the depth of the concave portion of the second non-planar structure 71. a2 is greater than a1, which means that the depth of the concave portion of the first non-planar structure 61 is greater than the depth of the concave portion of the second non-planar structure 71. Figure 6 a3 is marked as the height of the convex part of the first non-planar structure 61, and a4 is marked as the height of the convex part of the second non-planar structure 71. a4 is greater than a3, which means that the height of the convex part of the first non-planar structure 61 is greater than the height of the convex part of the second non-planar structure 71. In this way, the heights of the concave and convex parts of the upper and lower non-planar structures are different, so that the emission angle of the light emitted by the light-emitting functional layer 4 changes, and then the concave and convex parts of the two layers with different heights can change the refraction angle and reflection angle of the light, reduce the total reflected light, increase the refracted light, and improve the light extraction efficiency of the display panel.

[0078] Figure 7 A partial cross-sectional structural schematic diagram of a display panel according to another embodiment of the present application is shown.

[0079] In some embodiments, Figure 6 As shown, the first non-planar structure 61 and the second non-planar structure 71 are in a concave-convex shape, and the concave-convex shape of the first non-planar structure 61 and the concave-convex shape of the second non-planar structure 71 have at least one of the following relationships:

[0080] The cross-sectional shapes of the multiple recesses of the first non-planar structure 61 and the multiple recesses of the second non-planar structure 71 are different;

[0081] The cross-sectional shapes of the plurality of protrusions of the first non-planar structure 61 and the plurality of protrusions of the second non-planar structure 71 are different.

[0082] In this scheme, if Figure 6 As shown, the cross-sections of the concave and convex parts of the first non-planar structure 61 and the second non-planar structure 71 include arcs, triangles, ellipses, trapezoids, etc. Figure 7 As shown, the concave portion of the first non-planar structure 61 is a triangle, and the concave portion of the second non-planar structure 71 includes arc, triangle, ellipse, trapezoid, etc., that is, the cross-sectional shapes of the concave portions of the two non-planar structures are different. The convex portion of the first non-planar structure 61 is a triangle, and the convex portion of the second non-planar structure 71 includes arc, triangle, ellipse and trapezoid, that is, the cross-sectional shapes of the convex portions of the two non-planar structures are different. Figure 6 As shown, the direction perpendicular to the substrate 1 is 0°, the direction parallel to the substrate 1 is 90°, and 0° to 45° is a small angle, and 45° to 90° is a large angle. Figure 2 It can be seen that light ⑦ is a light emitted at 0°, light ⑧ is a light emitted at a small angle, and light ⑨ is a light emitted at a large angle. The light emitted at 0° can be directly emitted to the outside of the display panel. Due to the setting of the concave and convex parts of the first non-planar structure 61 and the second non-planar structure 71, the light emitted at a small angle of 0° to 45° is emitted to the outside of the display panel under the action of refracted light, thereby avoiding reflected light. The light emitted at a large angle of 45° to 90° is irradiated on the non-planar structure with a trapezoidal cross-section of the concave part. When reflected by the trapezoidal shape of the first non-planar structure 61, it is irradiated to the second non-planar structure 71 and emitted to the outside of the display panel, thereby increasing the light extraction efficiency. Since the cross-sectional shapes of the concave and convex parts of the first non-planar structure 61 and the second non-planar structure 71 are different, when the light emitted by the light-emitting functional layer 4 is irradiated on the concave and convex parts of the first non-planar structure 61, due to the reflection and refraction of light, the first non-planar structure 61 will reflect and refract the emitted light to the second non-planar structure 71, and reduce the total reflection of light through the second non-planar structure 71, thereby improving the light output efficiency of the display panel.

[0083] In some embodiments, in order to ensure that the end face of the light extraction layer 6 forms a non-planar structure, it is necessary to use materials with different expansion coefficients for production. Specifically, the light extraction layer 6 includes a first material and a second material, the first material and the second material are thermal expansion materials, and the thermal expansion coefficient of the first material is greater than the thermal expansion coefficient of the second material.

[0084] Exemplarily, the first material includes an organic material, for example, the first material includes N, N'-diphenyl-N, N'-(1-naphthyl)-1, 1'-biphenyl-4, 4'-diamine, referred to as NBP material, which is an organic semiconductor material with good thermal stability and chemical stability. The expansion coefficient of the NPB material can be understood as a melting point and a boiling point, with a melting point of 279-283°C and a boiling point of 772.5°C (at 760 mmHg). The second material includes a metal or an organic metal complex, for example, the second material includes 8-hydroxyquinoline aluminum (Aluminum tris (8-hydroxyquinoline), referred to as Alq3), the melting point of the Alq3 material is 236-238°C, and the boiling point is 375°C. If it is at 760 mmHg, its boiling point is 267°C. In comparison, the expansion coefficient of the first material is greater than the expansion coefficient of the second material. Thus, when the light extraction layer 6 is manufactured, a non-planar structure is easily generated due to the different expansion coefficients, making the manufacturing process of the light extraction layer 6 simpler.

[0085] In some embodiments, when manufacturing the light extraction layer 6, an evaporation process can be used for evaporation. After the evaporation process is completed, the light extraction layer 6 can continue to be heated to expand due to heat. When the material of the light extraction layer 6 expands due to heat, its maximum expansion height can reach about 40nm. Therefore, it is necessary to design the thickness of the light extraction layer 6 to be greater than 40nm. Exemplarily, the thickness of the light extraction layer 6 is optimally 50nm, so that the non-planar structure of the light extraction layer 6 is better, the concave-convex structure formed is more obvious, and the refractive index of light is increased, total reflection is reduced, and the light extraction rate of the display panel is improved.

[0086] In some embodiments, based on the above embodiments, since the expansion coefficients of the first material and the second material are quite different, in order to ensure the manufacturing effect of the light extraction layer 6, the non-planar structure produced thereby is more conducive to the light emission rate, and the ratio of the first material to the second material is made to be 1:1. In this way, when the light extraction layer 6 is manufactured by the evaporation process, the resulting concave-convex structure is more obvious, thereby changing the light emission angle, reducing total reflection, and improving the display efficiency of the display panel.

[0087] In some embodiments, the encapsulation layer 7 is a film layer used to protect the display panel. Therefore, the encapsulation layer 7 is made of silicon selenium materials such as silicon oxide and silicon oxynitride. Since this material has good waterproof properties, it can better protect the display panel.

[0088] In some embodiments, during the manufacturing process, in order to improve the light extraction efficiency of the display panel, a non-planar structure is also required on the top of the packaging layer 7. When the packaging layer 7 is made of silicon oxide or silicon oxynitride, argon ion plasma can be used to manufacture it on the top of the packaging layer 7 so that the end face of the packaging layer 7 forms a non-planar structure. This can also be understood as using plasma means to knock the packaging layer 7 so that the packaging layer 7 forms an uneven structure.

[0089] Figure 8 A flow chart of a display panel manufacturing method according to an embodiment of the present application is shown.

[0090] like Figure 8 As shown, based on the same inventive concept, the present application also provides a method for manufacturing a display panel, comprising the following steps:

[0091] Step 101, forming a driving function layer 2, a first electrode layer 3, a light emitting function layer 4 and a second electrode layer 5 in sequence on a base substrate 1;

[0092] Step 102, forming a light extraction layer 6 on a side of the second electrode layer 5 away from the light-emitting functional layer 4, and forming a first non-planar structure 61 on a side of the light extraction layer 6 away from the second electrode layer 5;

[0093] Step 103, forming an encapsulation layer 7 on the side of the light extraction layer 6 away from the second electrode layer 5, and forming a second non-planar structure 71 on the side of the encapsulation layer 7 away from the light extraction layer 6, wherein the first non-planar structure 61 and the second non-planar structure 71 have different morphologies.

[0094] The display panel manufacturing method provided in the present application forms a driving function layer 2, a first electrode layer 3, a light-emitting function layer 4 and a second electrode layer 5 on a base substrate 1 in sequence, and forms a light extraction layer 6 on some parts of the second electrode layer 5 away from the light-emitting function layer 4, and forms a first non-planar structure 61 on a side of the light extraction layer 6 away from the second electrode layer 5, so that the first non-planar structure 61 can change the angle of light emitted from the light-emitting function layer 4, thereby reducing the total reflection of light; forms an encapsulation layer 7 on a side of the light extraction layer 6 away from the second electrode layer 5, and forms a second non-planar structure 71 on a side of the encapsulation layer 7 away from the light extraction layer 6, and the morphology of the first non-planar structure 61 is different from that of the second non-planar structure 71, so that on the basis of the first non-planar structure 61 changing the angle of the emitted light, the second non-planar structure 71 further refracts part of the reflected light, thereby increasing the refracted light and better improving the light output rate of the display panel.

[0095] In this embodiment, the driving function layer 2 is a pixel circuit or a pixel driving circuit made on the base substrate 1, which is used to provide a driving electrical signal for the light-emitting unit composed of the first electrode layer 3, the light-emitting function layer 4 and the second electrode layer 5. The first electrode is an anode, and the material used for the anode can be metal, metal oxide or conductive polymer; wherein the metal includes copper, gold, silver, iron, chromium, nickel, manganese, palladium, platinum and the like and their alloys, the metal oxide includes indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide, indium gallium zinc oxide (IGZO) and the like, and the conductive polymer includes polyaniline, polypyrrole, poly (3-methylthiophene) and the like. In addition to the above materials and combinations thereof that facilitate hole injection, known materials suitable for anodes are also included. The light-emitting functional layer 4 may be a multi-layer structure, and the light-emitting functional layer 4 may include a light-emitting material layer, and may further include at least one of a hole injection layer, a hole transport layer, an electron blocking layer, a hole blocking layer, an electron transport layer and an electron injection layer, wherein the hole injection layer, the hole transport layer and the electron blocking layer are located between the anode and the light-emitting material layer, and the hole blocking layer, the electron transport layer and the electron injection layer are located between the light-emitting material layer and the cathode. The second electrode is a cathode, and the material used for the cathode may be a metal or a multi-layer metal material; wherein the metal includes aluminum, magnesium, silver, indium, tin, titanium, etc. and their alloys, and the multi-layer metal material includes LiF / Al, LiO2 / Al, BaF2 / Al, etc. In addition to the above materials and combinations thereof that facilitate electron injection, known materials suitable for the cathode are also included. A driving functional layer 2, a first electrode layer 3, a light-emitting functional layer 4 and a second electrode layer 5 are sequentially formed on the substrate 1 using a mask plate one-time patterning process.

[0096] In some embodiments, in the above step 102, a light extraction layer 6 is formed on the side of the second electrode layer 5 away from the light-emitting functional layer 4, and a first non-planar structure 61 is formed on the side of the light extraction layer 6 away from the second electrode layer 5, including: using a first material and a second material to evaporate on the second electrode layer 5 in a preset ratio to form the light extraction layer 6, and heating the light extraction layer 6 according to a preset temperature and a preset heating time to form the first non-planar structure 61 on the side of the light extraction layer 6 away from the second electrode layer 5.

[0097] Exemplarily, the first material includes an organic material, for example, the first material includes N, N'-diphenyl-N, N'-(1-naphthyl)-1, 1'-biphenyl-4, 4'-diamine, referred to as NBP material, which is an organic semiconductor material with good thermal stability and chemical stability. The expansion coefficient of the NPB material can be understood as a melting point and a boiling point, with a melting point of 279-283°C and a boiling point of 772.5°C (at 760 mmHg). The second material includes a metal or an organic metal complex, for example, the second material includes 8-hydroxyquinoline aluminum (Aluminum tris (8-hydroxyquinoline), referred to as Alq3), the melting point of the Alq3 material is 236-238°C, and the boiling point is 375°C. If it is at 760 mmHg, its boiling point is 267°C. In comparison, the expansion coefficient of the first material is greater than the expansion coefficient of the second material. Thus, when the light extraction layer 6 is manufactured, a non-planar structure is easily generated due to the different expansion coefficients, making the manufacturing process of the light extraction layer 6 simpler.

[0098] When manufacturing the light extraction layer 6, an evaporation process can be used for evaporation. After the evaporation process is completed, the light extraction layer 6 can continue to be heated to expand due to heat. When the material of the light extraction layer 6 expands due to heat, its maximum expansion height can reach about 40nm. Therefore, it is necessary to design the thickness of the light extraction layer 6 to be greater than 40nm. Exemplarily, the thickness of the light extraction layer 6 is optimally 50nm, so that the non-planar structure of the light extraction layer 6 is better, the concave-convex structure formed is more obvious, and the refractive index of light is increased, total reflection is reduced, and the light extraction rate of the display panel is improved.

[0099] When the evaporation process is used for evaporation, the optimal evaporation temperature is 90°C, and the heating time is greater than or equal to 20 minutes, that is, the preset temperature is 90°C; the preset heating time is greater than or equal to 20 minutes. In this way, while ensuring a good effect of forming the first non-planar surface, the production time of the entire display panel can also be saved.

[0100] Since the expansion coefficients of the first material and the second material are quite different, in order to ensure the manufacturing effect of the light extraction layer 6 and make the non-planar structure produced therein more conducive to the light emission rate, the ratio of the first material to the second material is made to be 1:1. In this way, when the light extraction layer 6 is manufactured by the evaporation process, the resulting concave-convex structure is more obvious, which can change the light emission angle, reduce total reflection, and improve the display efficiency of the display panel.

[0101] In some embodiments, in the above step 103, a second non-planar structure 71 is formed on the side of the encapsulation layer 7 away from the light extraction layer 6, including: bombarding the encapsulation layer 7 with a plasma bombardment method to form the second non-planar structure 71 on the side of the encapsulation layer 7 away from the light extraction layer 6.

[0102] Exemplarily, the plasma bombardment method can be performed using argon ion plasma on the top of the encapsulation layer 7 to form a non-planar structure on the end face of the encapsulation layer 7. This can also be understood as using plasma means to knock the encapsulation layer 7 to form an uneven structure of the encapsulation layer 7. In this way, the second non-planar structure 71 of the encapsulation layer 7 can further refract part of the reflected light from the first non-planar structure 61, thereby improving the light output rate of the display panel.

[0103] Furthermore, the plasma bombardment method in this embodiment and the evaporation process in the above-mentioned embodiment are both completed in a CVD process chamber, thereby simplifying the process flow and saving the time required to move the display panel when using other chambers for the evaporation process on the display panel.

[0104] Table 1 is the specific experimental data of the above embodiments of the present application.

[0105]

[0106] In summary, the technical solution in the present application has improved light extraction efficiency and service life compared to the prior art.

[0107] It should be noted that the method of the embodiment of the present application can be performed by a single device, such as a computer or server. The method of this embodiment can also be applied to a distributed scenario and completed by multiple devices cooperating with each other. In the case of such a distributed scenario, one of the multiple devices can only perform one or more steps in the method of the embodiment of the present application, and the multiple devices will interact with each other to complete the described method.

[0108] It should be noted that the above describes some embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the above embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0109] Fig. 9 A simplified structural diagram of a display device provided in one embodiment of the present application.

[0110] Based on the same inventive concept, corresponding to any of the above-mentioned embodiment methods, the present application also provides a display device.

[0111] refer to Fig. 9, the display device includes the display panel involved in the above embodiment. The specific structure and function of the display panel can be referred to the above related description, which will not be repeated here. The display device can be a product or component with display function such as a mobile phone, a tablet computer, a laptop computer and a TV. The display device also includes a mainboard, a control circuit, etc. These structures are the same or similar to the relevant structures of the existing display device. For details, please refer to the prior art and will not be repeated here.

[0112] For the convenience of description, the above device is described in terms of functions divided into various modules. Of course, when implementing the present application, the functions of each module can be implemented in the same or multiple software and / or hardware.

[0113] The device of the above embodiment is used to implement the corresponding display panel manufacturing method in any of the above embodiments, and has the beneficial effects of the corresponding method embodiment, which will not be described in detail here.

[0114] Based on the same inventive concept, corresponding to any of the above-mentioned embodiments, the present application also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the display panel manufacturing method described in any of the above embodiments is implemented.

[0115] Fig.10 A more specific schematic diagram of the hardware structure of an electronic device provided in this embodiment is shown, and the device may include: a processor 1010, a memory 1020, an input / output interface 1030, a communication interface 1040, and a bus 1050. The processor 1010, the memory 1020, the input / output interface 1030, and the communication interface 1040 are connected to each other through the bus 1050 in the device.

[0116] The processor 1010 can be implemented by a general-purpose CPU (Central Processing Unit), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the technical solutions provided in the embodiments of this specification.

[0117] The memory 1020 may be implemented in the form of ROM (Read Only Memory), RAM (Random Access Memory), static storage device, dynamic storage device, etc. The memory 1020 may store an operating system and other application programs. When the technical solutions provided in the embodiments of this specification are implemented by software or firmware, the relevant program codes are stored in the memory 1020 and are called and executed by the processor 1010.

[0118] The input / output interface 1030 is used to connect the input / output module to realize information input and output. The input / output module can be configured in the device as a component (not shown in the figure), or it can be externally connected to the device to provide corresponding functions. The input device may include a keyboard, a mouse, a touch screen, a microphone, various sensors, etc., and the output device may include a display, a speaker, a vibrator, an indicator light, etc.

[0119] The communication interface 1040 is used to connect a communication module (not shown) to realize communication interaction between the device and other devices. The communication module can realize communication through a wired mode (such as USB, network cable, etc.) or a wireless mode (such as mobile network, WIFI, Bluetooth, etc.).

[0120] The bus 1050 includes a path that transmits information between the various components of the device (eg, the processor 1010, the memory 1020, the input / output interface 1030, and the communication interface 1040).

[0121] It should be noted that, although the above device only shows the processor 1010, the memory 1020, the input / output interface 1030, the communication interface 1040 and the bus 1050, in the specific implementation process, the device may also include other components necessary for normal operation. In addition, it can be understood by those skilled in the art that the above device may also only include the components necessary for implementing the embodiments of the present specification, and does not necessarily include all the components shown in the figure.

[0122] The electronic device of the above embodiment is used to implement the corresponding display panel manufacturing method in any of the above embodiments, and has the beneficial effects of the corresponding method embodiment, which will not be described in detail here.

[0123] Based on the same inventive concept, corresponding to any of the above-mentioned embodiment methods, the present application also provides a non-transitory computer-readable storage medium, wherein the non-transitory computer-readable storage medium stores computer instructions, and the computer instructions are used to enable the computer to execute the display panel manufacturing method described in any of the above embodiments.

[0124] The computer-readable medium of this embodiment includes permanent and non-permanent, removable and non-removable media, and information storage can be implemented by any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, read-only compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device.

[0125] The computer instructions stored in the storage medium of the above embodiments are used to enable the computer to execute the display panel manufacturing method described in any of the above embodiments, and have the beneficial effects of the corresponding method embodiments, which will not be repeated here.

[0126] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present application (including the claims) is limited to these examples. In line with the concept of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0127] In addition, to simplify the description and discussion, and in order not to make the embodiments of the present application difficult to understand, the known power supply / ground connection with the integrated circuit (IC) chip and other components may or may not be shown in the provided drawings. In addition, the device can be shown in the form of a block diagram to avoid making the embodiments of the present application difficult to understand, and this also takes into account the fact that the details of the implementation of these block diagram devices are highly dependent on the platform to be implemented in the embodiments of the present application (that is, these details should be fully within the scope of understanding of those skilled in the art). In the case of elaborating specific details (e.g., circuits) to describe exemplary embodiments of the present application, it is obvious to those skilled in the art that the embodiments of the present application can be implemented without these specific details or when these specific details are changed. Therefore, these descriptions should be considered to be illustrative rather than restrictive.

[0128] Although the present application has been described in conjunction with specific embodiments of the present application, many replacements, modifications and variations of these embodiments will be apparent to those skilled in the art from the foregoing description. For example, other memory architectures (e.g., dynamic RAM (DRAM)) may use the embodiments discussed.

[0129] The embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of the present application.

Claims

1. A display panel, characterized in that: include: substrate substrate; A driving function layer is arranged on the base substrate; A first electrode layer is arranged on a side of the driving function layer away from the substrate; A light-emitting functional layer is arranged on a side of the first electrode layer away from the base substrate; A second electrode layer is arranged on a side of the light-emitting functional layer away from the first electrode layer; A light extraction layer is arranged on a side of the second electrode layer away from the light-emitting functional layer, and the side of the light extraction layer away from the second electrode layer is a first non-planar structure; An encapsulation layer is arranged on a side of the light extraction layer away from the second electrode layer, and a side of the encapsulation layer away from the light extraction layer is a second non-planar structure; The first non-planar structure and the second non-planar structure have different morphologies.

2. The display panel according to claim 1, characterized in that: The first non-planar structure and the second non-planar structure are in a concave-convex shape, and the concave-convex shape of the first non-planar structure and the concave-convex shape of the second non-planar structure have at least one of the following relationships: The orthographic projections of the plurality of recesses of the first non-planar structure and the plurality of recesses of the second non-planar structure on the substrate only partially overlap or do not overlap; The orthographic projections of the plurality of convex portions of the first non-planar structure and the plurality of convex portions of the second non-planar structure on the substrate only partially overlap or do not overlap; The plurality of recesses of the first non-planar structure have different depths than the plurality of recesses of the second non-planar structure; The heights of the plurality of protrusions of the first non-planar structure and the plurality of protrusions of the second non-planar structure are different; The plurality of recesses of the first non-planar structure have different cross-sectional shapes from the plurality of recesses of the second non-planar structure; The cross-sectional shapes of the plurality of protrusions of the first non-planar structure and the plurality of protrusions of the second non-planar structure are different.

3. The display panel according to claim 1, characterized in that: The thickness of the light extraction layer is greater than 40 nm.

4. The display panel according to claim 1, characterized in that: The light extraction layer includes a first material and a second material. The first material and the second material are thermal expansion materials. The thermal expansion coefficient of the first material is greater than the thermal expansion coefficient of the second material.

5. The display panel according to claim 4, characterized in that: The ratio of the first material to the second material is 1:1; and / or The first material includes an organic material, and the second material includes a metal or an organic metal complex.

6. The display panel according to claim 5, characterized in that: The first material includes N,N'-diphenyl-N,N'-(1-naphthyl)-1,1'-biphenyl-4,4'-diamine, the second material includes 8-hydroxyquinoline aluminum, and the encapsulation layer includes silicon oxide, silicon nitride and / or silicon oxynitride.

7. The display panel according to claim 1, characterized in that: The thickness of the encapsulation layer is greater than 0.5 μm.

8. A method for manufacturing a display panel, characterized in that: include: A driving function layer, a first electrode layer, a light emitting function layer and a second electrode layer are sequentially formed on the base substrate; Forming a light extraction layer on a side of the second electrode layer away from the light-emitting functional layer, and forming a first non-planar structure on a side of the light extraction layer away from the second electrode layer; An encapsulation layer is formed on a side of the light extraction layer away from the second electrode layer, and a second non-planar structure is formed on a side of the encapsulation layer away from the light extraction layer, wherein the first non-planar structure and the second non-planar structure have different morphologies.

9. The method according to claim 8, characterized in that A light extraction layer is formed on a side of the second electrode layer away from the light-emitting functional layer, and a first non-planar structure is formed on a side of the light extraction layer away from the second electrode layer, including: The first material and the second material are evaporated on the second electrode layer in a preset ratio to form the light extraction layer, and the light extraction layer is heated according to a preset temperature and a preset heating time to form the first non-planar structure on the side of the light extraction layer away from the second electrode layer.

10. The method according to claim 9, characterized in that The preset ratio is 1:1; and / or the preset temperature is 90° C.; and / or the preset heating time is greater than or equal to 20 minutes.

11. The method according to claim 8, characterized in that A second non-planar structure is formed on a side of the encapsulation layer away from the light extraction layer, comprising: The encapsulation layer is bombarded by a plasma bombardment method, so that the second non-planar structure is formed on a side of the encapsulation layer away from the light extraction layer.

12. A display device, characterized in that: The invention comprises a display panel as claimed in any one of claims 1 to 7.

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