WO2020258992A1 - 阵列基板的制备方法及阵列基板、显示面板 - Google Patents
阵列基板的制备方法及阵列基板、显示面板 Download PDFInfo
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- WO2020258992A1 WO2020258992A1 PCT/CN2020/084315 CN2020084315W WO2020258992A1 WO 2020258992 A1 WO2020258992 A1 WO 2020258992A1 CN 2020084315 W CN2020084315 W CN 2020084315W WO 2020258992 A1 WO2020258992 A1 WO 2020258992A1
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/1201—Manufacture or treatment
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/121—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements
- H10K59/1213—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements the pixel elements being TFTs
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/124—Insulating layers formed between TFT elements and OLED elements
Definitions
- the present disclosure relates to the technical field of display devices, in particular to a method for preparing an array substrate, an array substrate, and a display panel.
- OLED organic electroluminescence
- the embodiment of the present disclosure provides a method for preparing an array substrate, including:
- an anode layer, a light-emitting function layer and a cathode layer with the same undulating structure are sequentially formed on the surface of the planarization layer on the side away from the base substrate.
- forming a planarization layer mixed with nano-spheres on the side of each film layer contained in the pixel circuit away from the base substrate which specifically includes:
- the planarization layer mixed with nano-spheres is obtained.
- Also before coating a whole layer of colloidal layer mixed with nano-balls on the side of each film layer included in the pixel circuit away from the base substrate ,Also includes:
- the thickness of the planarization layer mixed with nano-spheres is smaller than the thickness of the pure planarization layer.
- the material of the nanospheres is polystyrene;
- the material of the colloidal layer is polymethylmethacrylate, polymethylglutarimide And one or more of phenolic resin;
- the removal of the nano-spheres adjacent to the planarization layer on the side surface away from the base substrate specifically includes:
- the chlorobenzene solution spraying is used to clean the surface of the planarization layer facing away from the base substrate, and remove the nanospheres adjacent to the surface of the planarization layer facing away from the base substrate.
- the method before using the chlorobenzene solution spraying to clean the surface of the planarization layer that faces away from the base substrate, the method further includes:
- planarization layer on the side surface of the planarization layer facing away from the base substrate is removed to expose the nanospheres adjacent to the planarization layer on the side surface away from the base substrate.
- the planarization layer on the side surface of the planarization layer facing away from the base substrate is removed by exposure.
- the thickness of the planarization layer mixed with nano-spheres is greater than the diameter of the nano-spheres.
- the diameter of the nanospheres is 10 nm to 200 nm; and the thickness of the planarization layer mixed with the nanospheres is 50 nm to 300 nm.
- forming each film layer included in the pixel circuit on the base substrate specifically includes:
- a first buffer layer, an active layer, a gate insulating layer, a first gate metal layer, an interlayer insulating layer, a second gate metal layer, a second buffer layer, and a source and drain metal layer are sequentially formed on the base substrate.
- forming a light-emitting function layer on the surface of the anode layer facing away from the base substrate specifically includes:
- a hole transport layer, an organic light emitting layer, a hole blocking layer, and an electron transport layer are sequentially formed on the surface of the anode layer on the side away from the base substrate.
- an array substrate including:
- the pixel circuit is located on the base substrate;
- a planarization layer located on a side of the pixel circuit away from the base substrate, and a surface of the planarization layer away from the base substrate has an undulating structure
- the anode layer is located on the side of the planarization layer away from the base substrate and has the same undulating structure
- the light-emitting function layer is located on the side of the anode layer away from the base substrate and has the same undulating structure
- the cathode layer is located on the side of the light-emitting function layer away from the base substrate and has the same undulating structure.
- nano-spheres are mixed in the planarization layer.
- the above-mentioned array substrate provided by the embodiment of the present disclosure further includes: a pure planarization layer located between the planarization layer and the pixel circuit, the pure planarization layer and the planarization layer
- the main body material is the same.
- the material of the nanospheres is polystyrene; the main material of the planarization layer is polymethylmethacrylate, polymethylglutaryl One or more of imine and phenolic resin.
- the thickness of the planarization layer is smaller than the thickness of the pure planarization layer.
- the embodiment of the present disclosure also provides a display panel, including the above-mentioned array substrate provided by the above-mentioned embodiment of the present disclosure.
- FIG. 1 is a schematic flowchart of a manufacturing method of an array substrate provided by an embodiment of the disclosure
- FIGS. 2 to 4 are respectively structural schematic diagrams after execution of each step in the method for manufacturing the array substrate provided by the embodiments of the disclosure;
- FIG. 5 is a schematic structural diagram of an array substrate provided by an embodiment of the disclosure.
- FIG. 6 is a schematic diagram of a partial film layer in an array substrate provided by an embodiment of the disclosure.
- OLED devices are limited by high refractive index components, and the light extraction efficiency is only about 20%, and about 80% of the light is restricted inside the device and eventually absorbed. Improving the light extraction of OLED devices is a research direction that has always been the focus of researchers.
- the main forms of light loss include: substrate mode, waveguide mode and plasma mode.
- the quasi-periodic wrinkle structure can effectively improve the light extraction of the substrate mode and the waveguide mode. Therefore, template imprinting is often used in the related art to prepare wrinkle or periodic concave-convex structures, and OLED display devices are mostly AMOLED top-emitting devices with bottom
- the fine TFT backplane structure and the small pixel size make it difficult to realize the uneven structure by embossing.
- the method for preparing an array substrate provided by an embodiment of the present disclosure specifically includes the following steps:
- a first buffer layer 21, an active layer 22, a gate insulating layer 23, a first gate metal layer 24, an interlayer insulating layer 25, and a second layer can be sequentially formed on the base substrate 1.
- FIG. 2 is illustrated by taking the pixel circuit 2 including a top-gate thin film transistor as an example.
- the film structure of the pixel circuit 2 is not limited to the above-mentioned film layer and film layer stacking relationship.
- a whole colloidal layer mixed with nano-spheres can be coated on the side of each film layer contained in the pixel circuit 2 away from the base substrate 1; afterwards, the colloidal layer mixed with the nano-spheres is cured. , The planarization layer 4 mixed with nano-spheres is obtained.
- it may further include: coating a whole colloidal layer on the side of each film layer contained in the pixel circuit 2 away from the base substrate 1; afterwards, the colloidal layer is cured to obtain Pure planarization layer 3, as shown in Figure 3. That is, before the planarization layer 4 mixed with nano-spheres is formed, a colloidal material that does not contain nano-spheres is used to level the film layer and then cured to form a pure planarization layer 3. In addition, the thickness of the planarization layer 4 mixed with nanospheres is generally smaller than the thickness of the pure planarization layer 3.
- the colloidal layer can be cured by heating.
- S103 Remove the nanospheres adjacent to the surface of the planarization layer 4 facing away from the base substrate 1 so that the surface of the planarization layer 4 facing away from the base substrate 1 has an undulating structure, as shown in FIG. 4.
- the material of the nanospheres may be polystyrene; the material of the colloid layer may be one or more of polymethylmethacrylate, polymethylglutarimide, and phenolic resin.
- the polystyrene nanospheres can be re-dissolved by chlorobenzene, and the material of the colloid layer is insoluble in chlorobenzene.
- the surface of the planarization layer 4 facing away from the base substrate 1 can be cleaned by spraying with a chlorobenzene solution. , Removing the nano-spheres adjacent to the surface of the planarization layer 4 facing away from the base substrate 1, so that the surface of the remaining planarization layer 4 forms an undulating structure.
- an anode layer 5 After patterning the planarization layer 4, an anode layer 5, a light-emitting function layer 6 and a cathode layer 7 with the same undulating structure are sequentially formed on the surface of the planarization layer 4 facing away from the base substrate 1, as shown in FIG.
- the anode layer 5 and the cathode layer 7 may be formed by physical vapor deposition, and the light-emitting function layer 6 may be formed by evaporation.
- a pixel definition layer 8 for defining the light-emitting area of the pixel is also formed on the side of the anode layer 5 away from the base substrate 1. It is worth noting that the part of the light-emitting function layer 6 and the cathode layer 7 in the opening area of the pixel definition layer 8 has the same undulating structure as the surface of the planarization layer 4, and the part above the pixel definition layer 8 serves as an invalid area and is Smooth structure (only the parts of the light-emitting function layer 6 and the cathode layer 7 in the opening area of the pixel definition layer 8 are shown in FIG. 5).
- forming a light-emitting function layer 6 on the surface of the anode layer 5 on the side facing away from the base substrate 1, as shown in FIG. 6, may include: sequentially forming a hole transport layer on the surface of the anode layer 5 on the side facing away from the base substrate 1. 61.
- FIG. 6 only shows each film layer in the opening area of the pixel definition layer 8.
- the planarization layer 4 mixed with nano-spheres is formed on the side of each film layer contained in the pixel circuit 2 away from the base substrate 1, and then the adjacent planarization layer 4 is removed.
- the nanospheres on the surface of the flattening layer 4 facing away from the base substrate 1 make the surface of the flattening layer 4 facing away from the base substrate 1 have an undulating structure, so that the flattening layer 4 faces away from the base substrate 1
- the anode layer 5, the light-emitting function layer 6 and the cathode layer 7 formed in sequence on the side surface have the same undulating structure, which can double the light-emitting efficiency of the light-emitting device, increase the isotropy of the light-emitting device, and greatly improve the The visual role deviation caused by the microcavity effect.
- the preparation method provided by the embodiments of the present disclosure has a simple process, is more suitable for preparing an array substrate in an AMOLED top-emitting device, and can better improve light extraction efficiency.
- step S103 before removing the nano-spheres adjacent to the planarization layer 4 on the side facing away from the base substrate 1, first Remove the planarization layer 4 on the surface of the planarization layer 4 facing away from the base substrate 1 to better expose the nanospheres on the surface of the planarization layer 4 facing away from the base substrate 1 so as to use chlorine.
- the benzene solution dissolves the exposed nanospheres.
- the material of the colloidal layer used has photosensitive characteristics. Therefore, during the preparation process, an exposure method can be used to remove a portion of the planarization layer 4 that faces away from the base substrate 1.
- the planarization layer 4 on the side surface is convenient and efficient to prepare.
- the thickness of the planarization layer 4 mixed with nano-spheres may be greater than the diameter of the nano-spheres, and the nano-spheres are wrapped by the colloid in the planarization layer 4, so It is necessary to remove the part of the planarization layer 4 away from the surface of the base substrate 1 first, and then remove the exposed nanospheres.
- the thickness of the planarization layer 4 mixed with nanospheres may also be less than or equal to the diameter of the nanospheres. The surface of the nanospheres facing away from the base substrate 1 will protrude from the planarization layer 4 away from the base substrate 1. Therefore, the exposed nanospheres can be directly removed.
- the diameter of the nanospheres may be 10 nm to 200 nm.
- the diameter of the nanospheres may be: 20 nm, 40 nm, 60 nm, 80 nm, 110 nm, 130 nm, 150 nm, 180 nm, 190 nm, etc., which are not limited here.
- the thickness of the planarization layer 4 mixed with nano-spheres may be 50 nm to 300 nm.
- an array substrate as shown in FIG. 5, including:
- the pixel circuit 2 is located on the base substrate 1;
- the planarization layer 4 is located on the side of the pixel circuit 2 away from the base substrate 1, and the surface of the planarization layer 4 away from the base substrate 1 has an undulating structure;
- the anode layer 5 is located on the side of the planarization layer 4 away from the base substrate 1 and has the same undulating structure;
- the light-emitting function layer 6 is located on the side of the anode layer 5 away from the base substrate 1 and has the same undulating structure;
- the cathode layer 7 is located on the side of the light-emitting function layer 6 away from the base substrate 1 and has the same undulating structure.
- the above-mentioned array substrate provided by the embodiment of the present disclosure is prepared by the above-mentioned preparation method, wherein the anode layer 5, the light-emitting function layer 6 and the cathode layer 7 on the surface of the planarization layer 4 facing away from the base substrate 1 have the same flatness.
- the same undulating structure on the surface of the chemical layer 4 can double the light-emitting efficiency of the light-emitting device, and can also increase the isotropy of the light from the device, and can greatly improve the apparent deviation caused by the microcavity effect.
- the pixel circuit 2 may include a first buffer layer 21, an active layer 22, and a gate insulating layer which are sequentially stacked on the base substrate 1.
- Layer 23 first gate metal layer 24, interlayer insulating layer 25, second gate metal layer 26, second buffer layer 27, source and drain metal layer 28 and other film layers.
- the nanospheres adjacent to the planarization layer 4 facing away from the base substrate 1 are removed. Later, there may remain mixed nano-spheres inside the planarization layer 4.
- the material of the nanospheres may be polystyrene; the main material of the planarization layer 4 may be polymethylmethacrylate, polymethylglutarimide One or more of amine and phenolic resin.
- it may further include: a pure planarization layer 3 located between the planarization layer 4 and the pixel circuit 2, a pure planarization layer 3 and The material of the main body of the planarization layer 4 is the same.
- the thickness of the planarization layer 4 is generally smaller than the thickness of the pure planarization layer 3.
- the light-emitting function layer 6, as shown in FIG. 6, may include: hole transport layers stacked in sequence on the surface of the anode layer 5 facing away from the base substrate 1.
- Layer 61 organic light emitting layer 62, hole blocking layer 63, electron transport layer 64 and other film layers.
- it may further include: a pixel definition layer 8 between the anode layer 5 and the light-emitting function layer 6 for defining the light-emitting area of the pixel.
- the present disclosure also provides a display panel, including the above-mentioned array substrate provided by the embodiments of the present disclosure.
- an array substrate provided with a planarization layer 4 having an undulating structure and a light emitting device having the same undulating structure as the planarization layer 4 is used, so that the display panel can be used In the process, the luminous efficiency is greatly improved, the isotropy of the light emitted by the device is increased, and the visual role deviation caused by the microcavity effect is greatly improved.
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Claims (17)
- 一种阵列基板的制备方法,其中,包括:在衬底基板上形成像素电路所包含的各膜层;在所述像素电路所包含的各膜层背离所述衬底基板的一侧形成混合有纳米小球的平坦化层;除去邻近所述平坦化层中背离所述衬底基板的一侧表面的纳米小球,使所述平坦化层背离所述衬底基板一侧的表面具有起伏结构;对所述平坦化层构图后,在所述平坦化层背离所述衬底基板一侧的表面依次形成具有相同起伏结构的阳极层、发光功能层和阴极层。
- 根据权利要求1所述的阵列基板的制备方法,其中,在所述像素电路所包含的各膜层背离所述衬底基板的一侧形成混合有纳米小球的平坦化层,具体包括:在所述像素电路所包含的各膜层背离所述衬底基板的一侧涂覆一整层混合有纳米小球的胶体层;对所述混合有纳米小球的胶体层进行固化后,得到所述混合有纳米小球的平坦化层。
- 根据权利要求2所述的阵列基板的制备方法,其中,在所述像素电路所包含的各膜层背离所述衬底基板的一侧涂覆一整层混合有纳米小球的胶体层之前,还包括:在所述像素电路所包含的各膜层背离所述衬底基板的一侧涂覆一整层胶体层;对所述胶体层进行固化后,得到纯平坦化层。
- 根据权利要求3所述的阵列基板的制备方法,其中,所述混合有纳米小球的平坦化层的厚度小于所述纯平坦化层的厚度。
- 根据权利要求3所述的阵列基板的制备方法,其中,所述纳米小球的材质为聚苯乙烯;所述胶体层的材质为聚甲基丙烯酸甲酯、聚甲基戊二酰亚 胺和酚醛树脂中的一种或多种;除去邻近所述平坦化层中背离所述衬底基板的一侧表面的纳米小球,具体包括:采用氯苯溶液喷涂清洗所述平坦化层中背离所述衬底基板的一侧表面,去除邻近所述平坦化层中背离所述衬底基板的一侧表面的纳米小球。
- 根据权利要求5所述的阵列基板的制备方法,其中,采用氯苯溶液喷涂清洗所述平坦化层中背离所述衬底基板的一侧表面之前,还包括:去除所述平坦化层中背离所述衬底基板的一侧表面的平坦化层,以暴露出邻近所述平坦化层中背离所述衬底基板的一侧表面的纳米小球。
- 根据权利要求6所述的阵列基板的制备方法,其中,采用曝光的方式去除所述平坦化层中背离所述衬底基板的一侧表面的平坦化层。
- 根据权利要求6所述的阵列基板的制备方法,其中,所述混合有纳米小球的平坦化层的厚度大于所述纳米小球的直径。
- 根据权利要求8所述的阵列基板的制备方法,其中,所述纳米小球的直径为10nm至200nm;所述混合有纳米小球的平坦化层的厚度为50nm至300nm。
- 根据权利要求1-9任一项所述的阵列基板的制备方法,其中,在衬底基板上形成像素电路所包含的各膜层,具体包括:在衬底基板上依次形成第一缓冲层、有源层、栅绝缘层、第一栅极金属层、层间绝缘层、第二栅极金属层、第二缓冲层、源漏极金属层。
- 根据权利要求1-9任一项所述的阵列基板的制备方法,其中,在所述阳极层背离所述衬底基板一侧的表面形成发光功能层,具体包括:在所述阳极层背离所述衬底基板一侧的表面依次形成空穴传输层、有机发光层、空穴阻挡层、电子传输层。
- 一种阵列基板,其中,包括:衬底基板;像素电路,位于所述衬底基板上;平坦化层,位于所述像素电路背离所述衬底基板的一侧,所述平坦化层背离所述衬底基板的一侧表面具有起伏结构;阳极层,位于所述平坦化层背离所述衬底基板的一侧且与具有相同起伏结构;发光功能层,位于所述阳极层背离所述衬底基板的一侧且与具有相同起伏结构;阴极层,位于所述发光功能层背离所述衬底基板的一侧且与具有相同起伏结构。
- 根据权利要求12所述的阵列基板,其中,所述平坦化层内部混合有纳米小球。
- 根据权利要求12或13所述的阵列基板,其中,还包括:位于所述平坦化层与所述像素电路之间的纯平坦化层,所述纯平坦化层和所述平坦化层的主体材质相同。
- 根据权利要求14所述的阵列基板,其中,所述纳米小球的材质为聚苯乙烯;所述平坦化层的主体材质为聚甲基丙烯酸甲酯、聚甲基戊二酰亚胺和酚醛树脂中的一种或多种。
- 根据权利要求14所述的阵列基板,其中,所述平坦化层的厚度小于所述纯平坦化层的厚度。
- 一种显示面板,其中,包括权利要求12-16任一项所述的阵列基板。
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