WO2021031414A1 - 显示面板的制备方法及其功能层的制备方法 - Google Patents

显示面板的制备方法及其功能层的制备方法 Download PDF

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Publication number
WO2021031414A1
WO2021031414A1 PCT/CN2019/118978 CN2019118978W WO2021031414A1 WO 2021031414 A1 WO2021031414 A1 WO 2021031414A1 CN 2019118978 W CN2019118978 W CN 2019118978W WO 2021031414 A1 WO2021031414 A1 WO 2021031414A1
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Prior art keywords
solvent
layer
amount
ink layer
area
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PCT/CN2019/118978
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English (en)
French (fr)
Inventor
翁德志
王杲祯
Original Assignee
武汉华星光电半导体显示技术有限公司
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Priority to US16/641,585 priority Critical patent/US11223015B1/en
Publication of WO2021031414A1 publication Critical patent/WO2021031414A1/zh

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Classifications

    • 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
    • H10K59/30—Devices specially adapted for multicolour light emission
    • H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
    • H10K50/14—Carrier transporting layers
    • H10K50/15—Hole transporting layers
    • 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
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
    • H10K71/10—Deposition of organic active material
    • H10K71/12—Deposition of organic active material using liquid deposition, e.g. spin coating
    • H10K71/13—Deposition of organic active material using liquid deposition, e.g. spin coating using printing techniques, e.g. ink-jet printing or screen printing
    • H10K71/135—Deposition of organic active material using liquid deposition, e.g. spin coating using printing techniques, e.g. ink-jet printing or screen printing using ink-jet printing
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
    • H10K71/10—Deposition of organic active material
    • H10K71/12—Deposition of organic active material using liquid deposition, e.g. spin coating
    • H10K71/15—Deposition of organic active material using liquid deposition, e.g. spin coating characterised by the solvent used
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K2102/00—Constructional details relating to the organic devices covered by this subclass
    • H10K2102/301—Details of OLEDs
    • H10K2102/351—Thickness
    • 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
    • H10K59/122—Pixel-defining structures or layers, e.g. banks

Definitions

  • This application relates to the technical field of display panels, and in particular to a method for preparing a display panel and a method for preparing a functional layer thereof.
  • the inkjet printing (IJP) method to prepare OLED (Organic Light-Emitting Diode, organic electroluminescence) devices has the advantages of simple operation, low cost, simple process, easy to achieve large size, etc., mainly through micron-level printing nozzles
  • a solution containing active materials, such as HIL (hole injection layer), HTL (hole transport layer), and red, green, and blue light-emitting materials, are sprayed on the sub-pixels (light-emitting areas) on the patterned substrate, respectively,
  • the red, green, and blue light-emitting pixel units are formed, and the thickness of the formed film layer is determined by the amount of solute printed in the sub-pixels.
  • the inkjet printing material must be dissolved in a solvent to form a solution before printing, and then the solvent in the solution is evaporated by an evaporation process to form a film layer.
  • the nozzle prints the solution above the display area of the substrate.
  • the solvent on the substrate is evaporated.
  • the closer to the center of the display area of the substrate the more solvent atmosphere will be emitted.
  • the difference causes uneven film thickness in the display area, affects the overall film thickness uniformity, and seriously affects the light-emitting performance of the OLED device.
  • the present application provides a method for preparing a display panel and a method for preparing a functional layer.
  • the amount of solvent at the edge of the ink layer is greater than that of the ink layer.
  • the amount of solvent in the center of the display panel solves the problem of uneven film formation of the functional layer due to the different solvent atmosphere above the display area of the substrate during the process of evaporating the solvent when preparing the functional layer of the display panel by inkjet printing.
  • a virtual pixel layer is set around the display area to realize the design of the narrow frame of the display panel.
  • the present application provides a method for preparing a functional layer of a display panel.
  • the display panel includes a substrate.
  • the method includes the following steps:
  • the ink layer includes a solute and a solvent that dissolves the solute; wherein the amount of solute in different positions of the ink layer is the same, and the ink The amount of solvent at the edge of the layer is greater than the amount of solvent at the center of the ink layer;
  • the solvent in the ink layer is evaporated to form a functional layer with uniform film thickness.
  • the amount of the solvent gradually increases from the center of the ink layer to the edge of the ink layer.
  • the ink layer includes a central area, and different positions of the central area have the same amount of solvent; In the direction of the edge, the amount of the solvent gradually increases.
  • the solvent includes a first solvent and a second solvent; the ink-jet printing technology is used to print an ink layer on the display area of the substrate, including The following steps:
  • Inkjet printing technology is used to print a second solvent on the first solvent in which the solute is dissolved to form an ink layer; wherein, the amount of the first solvent at different positions of the ink layer is the same, and the edges of the ink layer The amount of the second solvent is greater than the amount of the second solvent in the center of the ink layer.
  • the first solvent and the second solvent are made of the same material.
  • the amount of the second solvent gradually increases from the center of the ink layer toward the edge of the ink layer.
  • the ink layer includes a central area, and the amount of the second solvent gradually increases from the central area toward the edge of the ink layer. Increase.
  • the functional layer includes a hole injection layer, a hole transport layer, or a light emitting layer.
  • the display area of the substrate includes a plurality of sub-pixel regions, the plurality of sub-pixel regions are distributed in an array, and the ink layer is formed on the plurality of sub-pixel regions.
  • the amount of solute per unit area in each sub-pixel area is the same, and the amount of solvent per unit area in the sub-pixel area close to the edge of the display area is greater than that in the sub-pixel area close to the center of the display area The amount of solvent per unit area.
  • the substrate includes a base substrate, a TFT array layer disposed on the base substrate, and anodes disposed on the TFT array layer at intervals. And a pixel definition layer arranged around the anode; wherein the anode is located in the display area, and the pixel definition layer surrounds the anode to form the sub-pixel area.
  • the sub-pixel area includes a red sub-pixel area, a green sub-pixel area, and a blue sub-pixel area.
  • the embodiment of the present application also provides a method for preparing a functional layer of a display panel.
  • the display panel includes a substrate.
  • the method includes the following steps:
  • inkjet printing technology to print a second solvent on the first solvent in which the solute is dissolved to form an ink layer; wherein, the amount of solute in different positions of the ink layer is the same, and the first solvent in different positions of the ink layer The amount of one solvent is the same, and the amount of the second solvent at the edge of the ink layer is greater than the amount of the second solvent at the center of the ink layer;
  • the first solvent and the second solvent in the ink layer are evaporated to form a functional layer with uniform film thickness.
  • the embodiment of the present application also provides a method for manufacturing a display panel, including the following steps:
  • the above-mentioned method for preparing the functional layer of the display panel is used to form a stacked multi-layer functional layer on the substrate;
  • the multi-layer functional layer includes a hole injection layer, a hole transport layer and a light-emitting layer arranged in sequence.
  • the amount of the solvent gradually increases from the center of the ink layer toward the edge of the ink layer.
  • the ink layer includes a central area, and different positions of the central area have the same amount of solvent; a direction from the central area toward the edge of the ink layer Above, the amount of the solvent gradually increased.
  • the display area of the substrate includes a plurality of sub-pixel areas, the plurality of sub-pixel areas are arranged in an array, and the multi-layer functional layer is formed in each sub-pixel area .
  • the substrate includes a base substrate, a TFT array layer disposed on the base substrate, an anode disposed on the TFT array layer at intervals, and a surrounding area.
  • the pixel definition layer provided with the anode; wherein the anode is located in the display area, and the pixel definition layer surrounds the anode to form the sub-pixel area.
  • the amount of solvent in the center of the layer is such that when the solvent in the ink layer of the display area is evaporated, the solvent atmosphere concentration in the entire display area of the substrate is approximately the same, so that the volatilization speed of the solvent in the entire ink layer of the substrate is approximately the same, and avoids Because the solvent at the edge of the ink layer evaporates too fast and takes away part of the solute dissolved in the solvent, the application can produce a functional layer with uniform film thickness; in addition, the application maintains the solvent over the entire display area of the substrate When the atmospheric concentration is approximately the same, the virtual pixel layer that cannot be used for display will not be increased. While ensuring the uniform thickness of the formed functional layer, the display panel can also be narrowed.
  • FIG. 1 is a schematic flowchart of a method for manufacturing a functional layer of a display panel according to an embodiment of the application
  • FIG. 2 is a schematic diagram of a partial cross-sectional structure of a display panel during an inkjet printing process according to an embodiment of the application;
  • FIG. 3 is a schematic diagram of a partial cross-sectional structure of a display panel provided by an embodiment of the application.
  • FIG. 4 is a schematic diagram of a display panel provided by an embodiment of the application.
  • FIG. 5 is a schematic block diagram of the flow of another method for manufacturing a functional layer of a display panel according to an embodiment of the application;
  • FIG. 6 is a schematic diagram of a partial cross-sectional structure of a display panel in another inkjet printing process according to an embodiment of the application;
  • FIG. 7 is a graph showing the variation of the amount of the second solvent printed in the blue sub-pixel area with the distance of the blue sub-pixel area from the center position of the display area according to an embodiment of the application.
  • connection should be interpreted broadly unless otherwise clearly specified and limited.
  • it can be a fixed connection or a detachable connection. Connected or integrally connected; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components.
  • connection should be interpreted broadly unless otherwise clearly specified and limited.
  • it can be a fixed connection or a detachable connection. Connected or integrally connected; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components.
  • an embodiment of the present application provides a method for preparing a functional layer of a display panel.
  • the display panel 1 includes a substrate 3.
  • the method for preparing a functional layer 2 of the display panel 1 includes The following steps:
  • S101 Use inkjet printing technology to print an ink layer on the display area of the substrate.
  • the ink layer includes a solute and a solvent that dissolves the solute; wherein the amount of solute in different positions of the ink layer is the same, and the amount of solvent at the edge of the ink layer is greater than The amount of solvent in the center of the ink layer;
  • the bottom area of the ink layer 4 (that is, the orthographic projection area of the side of the ink layer 4 close to the substrate 3 on the substrate 3) is the light-emitting area of the display panel 1.
  • the amount of solute 5 in all embodiments of the application is equal It refers to the amount of solute 5 per unit light-emitting area, and the amount of solvent 6 refers to the amount of solvent 6 per unit light-emitting area.
  • the display panel 1 includes an organic electroluminescence display panel; the functional layer 2 includes a hole injection layer, a hole transport layer or a light emitting layer; the display area 15 of the substrate 3 corresponds to the display area of the display panel 1.
  • the display area 15 of the substrate 3 includes a plurality of sub-pixel regions 7, and the plurality of sub-pixel regions 7 are arranged in an array, and the ink layer 4 is formed in the plurality of sub-pixel regions 7; each sub-pixel region
  • the amount of solute 5 on the unit area (or unit bottom area, where the bottom area is the orthographic projection area on the substrate 3 of the side of the sub-pixel region 7 close to the substrate 3, that is, the light-emitting area of the display panel 1) in 7 is the same, Moreover, the amount of solvent 6 per unit area in the sub-pixel area 7 close to the edge of the display area 15 is greater than the amount of solvent 6 per unit area in the sub-pixel area 7 close to the center of the display area 15.
  • the sub-pixel area 7 includes a red sub-pixel area, a green sub-pixel area, and a blue sub-pixel area. The red sub-pixels, green sub-pixels, and blue sub-pixels are formed correspondingly.
  • the size design of the three sub-pixels is different, which is specifically manifested in that the bottom areas of the three sub-pixel areas 7 are different, and the three types of sub-pixels formed have different volumes, among which the blue sub-pixel has the largest volume;
  • the pixel is composed of multiple functional layers 2 superimposed; therefore, under the premise of ensuring uniform film thickness, the volume of the functional layer 2 formed in the three sub-pixel regions 7 is different, but the height is the same, that is, the solute 5 in the three sub-pixel regions 7 The total amount of is different, but the amount of solute 5 per unit area is the same.
  • the substrate 3 of the display panel 1 includes a base substrate 8, a TFT (Thin Film Transistor (Thin Film Transistor) array layer 9 and anode 10 and pixel defining layer 11 arranged on the TFT array layer 9 at intervals; wherein, the anode 10 is located in the display area 15 and the pixel defining layer 11 surrounds the anode 10 to form a sub-pixel area 7.
  • TFT Thin Film Transistor
  • the amount of solute 5 at different positions is the same, and the amount of solvent 6 at the edge of the ink layer 4 is greater than
  • the amount of solvent 6 in the center of the ink layer 4 is such that when the solvent 6 in the ink layer 4 of the display area 15 is evaporated, the solvent atmosphere concentration of the entire display area 15 of the substrate 3 is approximately the same, so that the entire display area 15 of the substrate 3
  • the volatilization speed of the solvent 6 is approximately the same, and it is avoided that the solvent 6 at the edge of the ink layer 4 volatilizes too fast to take away some of the solute 5 dissolved in the solvent 6.
  • this embodiment can achieve a uniform film thickness.
  • Layer 2 In addition, this embodiment keeps the concentration of the solvent atmosphere above the entire display area 15 of the substrate 3 approximately the same, and will not add a virtual pixel layer that cannot be used for display around the display area 15, ensuring the function of formation While the thickness of the layer 2 is uniform, the display panel 1 can also be narrowed.
  • the amount of the solvent 6 gradually increases.
  • the amount of solvent 6 in different positions of the ink layer 4 depends on the distance from the center of the ink layer 4. The greater the distance, the more solvent 6 so that the solvent 6 in different positions of the ink layer 4 will evaporate and dry.
  • the medium volatilization speed is approximately the same, which is beneficial to realize the formation of the functional layer 2 with uniform film thickness.
  • an embodiment of the present application also provides a method for preparing a functional layer of a display panel.
  • the ink layer 4 includes a central area 12, and the amount of solvent 6 in different positions of the central area 12 Same; from the central area 12 toward the edge of the ink layer 4, the amount of solvent 6 gradually increases.
  • the volatilization speed of the solvent 6 in the central area 12 of the ink layer 4 is approximately the same, but it is lower than the volatilization speed of the solvent 6 at the edge of the ink layer 4. Therefore, the solvents at different positions in the central area 12 of the ink layer 4 The amount of solvent 6 remains the same. From the central area 12 to the edge of the ink layer 4, gradually increasing the amount of solvent 6 can reduce the volatilization speed of the solvent 6 in the direction from the central area 12 to the edge of the ink layer 4. , So that the solvent 6 at different positions of the ink layer 4 evaporates at approximately the same speed during the evaporation and drying process, which is beneficial to realize the formation of the functional layer 2 with uniform film thickness.
  • an embodiment of the present application also provides a method for preparing a functional layer of a display panel.
  • the solvent 6 includes a first solvent 13 and a second solvent 14;
  • step S101 using inkjet printing technology to print an ink layer on the display area of the substrate includes the following steps:
  • S502 Using inkjet printing technology to print the second solvent on the first solvent dissolved with the solute (second inkjet printing) to form an ink layer; wherein the amount of the first solvent in different positions of the ink layer is the same, the ink The amount of the second solvent at the edge of the layer is greater than the amount of the second solvent at the center of the ink layer.
  • the materials of the first solvent 13 and the second solvent 14 are the same.
  • the second solvent 14 can be printed on the first solvent 13 in which the solute 5 is dissolved in the entire display area 15, and the amount of the second solvent 14 is gradually from the center of the ink layer 4 toward the edge of the ink layer 4 Increase;
  • the second solvent 14 can also be printed on the first solvent 13 in which the solute 5 is dissolved in part of the display area 15.
  • the formed ink layer 4 includes the central area 12, and the central area 12 does not need to be printed with the second solvent 14. From the central area 12 toward the edge of the ink layer 4, the amount of the second solvent 14 printed gradually increases.
  • the ink layer 4 is formed by two inkjet printing.
  • the amount of solute 5 printed at different positions of the display area 15 of the substrate 3 during the first inkjet printing The same and the same amount of the first solvent 13 at different positions; because the solvent 6 on the surface of the substrate 3 volatilizes at different speeds during the vacuum drying process, the solvent 6 at the edge of the display area 15 volatilizes faster than the middle part.
  • the solvent 6 easily takes away part of the solute 5, resulting in uneven film thickness of the formed functional layer 2 (the middle part is thicker than the edge area), which seriously affects the efficiency of the display panel 1.
  • the second solvent 14 is supplemented on the printed first solvent 13 in which the solute 5 is dissolved to form the ink layer 4, and the amount of the second solvent 14 at the edge of the ink layer 4 is greater than that at the center of the ink layer 4
  • the total amount of solvent at the edge of the ink layer 4 is greater than the total amount of solvent at the center of the ink layer 4, so that when the solvent in the ink layer 4 of the display area 15 is evaporated, the solvent atmosphere concentration of the entire display area 15 of the substrate 3 is approximately
  • the volatilization speed of the solvent 6 on the entire ink layer 4 of the substrate 3 is approximately the same, and the volatilization speed of the solvent 6 at the edge of the ink layer 4 is too fast to take away more solutes 5.
  • this embodiment can be manufactured A functional layer 2 with a uniform film thickness is obtained; in addition, the present application does not add a virtual pixel layer that cannot be used for display around the display area 15 while keeping the solvent atmosphere concentration above the entire display area 15 of the substrate 3 approximately the same. While ensuring that the formed functional layer 2 has a uniform thickness, the display panel 1 can also be narrowed.
  • the embodiment of the present application also provides a method for preparing a functional layer of a display panel.
  • the functional layer 2 is a light-emitting layer
  • the solute 5 in the ink layer 4 includes red (R) light-emitting material, green (G ) Luminescent material and blue (B) luminescent material, and the red luminescent material, green luminescent material and blue luminescent material are printed in different sub-pixel regions 7 respectively.
  • the sub-pixel area printed with the red light-emitting material is a red sub-pixel area
  • the sub-pixel area printed with the green light-emitting material is a green sub-pixel area
  • the sub-pixel area printed with a blue light-emitting material is a blue sub-pixel area
  • the bottom area of the blue sub-pixel area is greater than the bottom area of the red sub-pixel area and the green sub-pixel area
  • the volume of the light-emitting layer formed in the three sub-pixel areas is different, but the height is the same, that is, the light-emitting materials in the three sub-pixel areas
  • the total amount of (solute) is different, but the amount of luminescent material per unit area is the same.
  • the amount of the second solvent 14 that needs to be refilled for printing in the sub-pixel regions 7 at different positions of the display area 15 can be obtained by computer simulation.
  • the amount (y) of the second solvent 14 printed in the blue sub-pixel area of the display area 15 is calculated by computer simulation.
  • the variation curve diagram of the distance (x) between the color sub-pixel area and the center of the display area 15 is shown in FIG. 7.
  • the distance x from the center of the display area 15 is 2cm, 4cm, 6cm and 8cm, respectively
  • the amount y of the second solvent 14 that needs to be printed in the blue sub-pixel area is about 0.3 pl, 0.6 pl, 1.3 pl, and 2.8 pl, respectively.
  • the materials of the first solvent 13 and the second solvent 14 include propylene glycol methyl ether acetate or diethylene glycol methyl ethyl ether.
  • the solvent volatilizes at different speeds on the surface of the substrate (the solvent at the edge of the display area volatilizes faster than The middle part), which easily leads to uneven film thickness of the light-emitting layer formed (the middle part is thicker than the edge area), which seriously affects the light-emitting effect of the display panel; the red light-emitting material, green light-emitting material and blue light-emitting material are respectively dissolved in the embodiments of this application.
  • the second solvent 14 is additionally printed to ensure that the amount of solute per unit area in each sub-pixel area is the same, and the amount of solute per unit area in the sub-pixel area at the edge of the display area 15
  • the amount of solvent is more than the amount of solvent per unit area in the sub-pixel area located in the middle part of the display area 15, so that during the vacuum drying process, the volatilization speed of the solvent at the edge of the display area 15 is equal to that of the solvent in the middle part of the display area 15.
  • the volatilization speed is equivalent, so that the film thickness of the light-emitting layer produced in the entire display area 15 is uniform.
  • an embodiment of the present application also provides a method for manufacturing a display panel, including the following steps:
  • the above-mentioned method for preparing the functional layer 2 of the display panel 1 is used to form a stacked multi-layer functional layer 2 on the substrate 3;
  • the multi-layer functional layer 2 includes a hole injection layer, a hole transport layer and a light emitting layer arranged in sequence.
  • the display panel 1 includes a substrate 3.
  • the substrate 3 includes a base substrate 8, a TFT array layer 9 arranged on the base substrate 8, and anodes 10 and pixels arranged on the TFT array layer 9 at intervals.
  • Definition layer 11 Among them, the anode 10 is located in the display area 15, and the pixel definition layer 11 surrounds the anode 10 to form a pixel opening (ie, the sub-pixel area 7); the multilayer functional layer 2 is formed on the anode 10 in the pixel opening.
  • the amount of solute 5 at different positions is the same, and the amount of solvent 6 at the edge of the ink layer 4 is greater than
  • the amount of solvent 6 in the center of the ink layer 4 is such that when the solvent 6 in the ink layer 4 of the display area 15 is evaporated, the solvent atmosphere concentration of the entire display area 15 of the substrate 3 is approximately the same, so that the entire ink layer 4 of the substrate 3
  • the volatilization speed of the solvent 6 is approximately the same, and it is avoided that the solvent 6 at the edge of the ink layer 4 volatilizes too fast to take away some of the solute 5 dissolved in the solvent 6 so as to form a functional layer 2 with a uniform film thickness.
  • the luminous efficiency and service life of the display panel 1 in addition, the present application will not add a virtual pixel layer around the display area 15 that cannot be used for display while keeping the solvent atmosphere concentration above the entire display area 15 of the substrate 3 approximately the same. Therefore, while ensuring that the formed functional layer 2 has a uniform thickness, the display panel 1 can also be narrowed.

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  • Manufacturing & Machinery (AREA)
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Abstract

本申请提供了一种显示面板的制备方法及其功能层的制备方法，功能层的制备方法包括以下步骤：采用喷墨打印技术在显示面板的基板的显示区打印形成油墨层，油墨层包括溶质和溶剂；其中，油墨层的不同位置的溶质的量相同，且油墨层的边缘的溶剂的量大于油墨层的中心的溶剂的量；蒸发掉油墨层中的溶剂，形成膜厚均匀的功能层。

Description

显示面板的制备方法及其功能层的制备方法 技术领域
本申请涉及显示面板技术领域，尤其涉及一种显示面板的制备方法及其功能层的制备方法。
 背景技术
这里的陈述仅提供与本申请有关的背景信息，而不必然地构成现有技术。
目前，喷墨打印（IJP）方法制备OLED（Organic Light-Emitting Diode，有机电致发光）器件具有操作简单、成本低廉、工艺简单、易于实现大尺寸等优点，主要是通过微米级的打印喷头将含有活性材料，如HIL（空穴注入层）、HTL（空穴传输层）以及红、绿、蓝三色发光材料的溶液，分别喷涂在图案化的基板上的子像素（发光区）中，形成红绿蓝三基色发光像素单元，所形成的膜层的厚度由打印在子像素中的溶质数量决定。
但是，喷墨打印的材料必须溶解在溶剂中形成溶液才可以打印，后续再通过蒸发工艺蒸发掉溶液中的溶剂，形成膜层。在打印过程中，喷头在基板的显示区的上方喷墨打印溶液，打印完成后，蒸发基板上的溶剂，在溶剂蒸发过程中，越靠近基板的显示区的中心的地方挥发出的溶剂气氛越浓，越接近于饱和态，其下面的溶液不容易干；越靠近边缘区域，上面的溶剂气氛越稀薄，基板上的溶剂越容易挥发，使得显示区中间部分和边缘部分溶剂挥发的速度存在明显差异，造成显示区膜厚不均匀，影响整体的膜厚均匀性，且严重影响OLED器件的发光性能。
现有技术为了解决上述显示区膜厚不均、显示不佳的问题，需要在显示区周围制作一圈虚拟像素层，喷墨打印时在虚拟像素层也打印溶液，这样虚拟像素层上溶液的存在可以很好的扩展饱和区域的范围，保证了打印后的基板在蒸发过程中显示区的中间与边缘的溶剂气氛一致。但是，该虚拟像素层对不能用于显示，且该位置处不能够进行封装(影响封装效果) ，因此需要在虚拟像素层外围设置封装区，从而增加了边框的宽度，造成难以窄边框化。
因此，急需一种有效的方法来解决喷墨打印成膜时，蒸发溶剂的过程中因基板的显示区上方的溶剂气氛不同，导致显示区成膜不均匀的问题，且同时能实现OLED器件窄边框的设计。
 技术问题
本申请提供一种显示面板的制备方法及其功能层的制备方法，通过控制喷墨打印在基板显示区的油墨层的不同位置的溶剂的量，使得油墨层的边缘的溶剂的量大于油墨层的中心的溶剂的量，解决了喷墨打印制备显示面板的功能层时，蒸发溶剂的过程中因基板的显示区上方的溶剂气氛不同，导致功能层成膜不均匀的问题，且避免了在显示区周围设置虚拟像素层，实现了显示面板窄边框的设计。
 技术解决方案
为解决上述问题，本申请提供的技术方案如下：
本申请提供一种显示面板的功能层的制备方法，所述显示面板包括基板，所述制备方法包括以下步骤：
采用喷墨打印技术在所述基板的显示区打印形成油墨层，所述油墨层包括溶质和溶解所述溶质的溶剂；其中，所述油墨层的不同位置的溶质的量相同，且所述油墨层的边缘的溶剂的量大于所述油墨层的中心的溶剂的量；
蒸发掉所述油墨层中的溶剂，形成膜厚均匀的功能层。
在本申请实施例所提供的显示面板的功能层的制备方法中，从所述油墨层的中心朝向所述油墨层的边缘的方向上，所述溶剂的量逐渐增大。
在本申请实施例所提供的显示面板的功能层的制备方法中，所述油墨层包括中心区域，所述中心区域的不同位置的溶剂的量相同；从所述中心区域朝向所述油墨层的边缘的方向上，所述溶剂的量逐渐增大。
在本申请实施例所提供的显示面板的功能层的制备方法中，所述溶剂包括第一溶剂和第二溶剂； 所述采用喷墨打印技术在所述基板的显示区打印形成油墨层，包括以下步骤：
采用喷墨打印技术在所述基板的显示区打印溶解有溶质的第一溶剂；
采用喷墨打印技术在所述溶解有溶质的第一溶剂上打印第二溶剂，以形成油墨层；其中，所述油墨层的不同位置的第一溶剂的量相同，所述油墨层的边缘的第二溶剂的量大于所述油墨层的中心的第二溶剂的量。
在本申请实施例所提供的显示面板的功能层的制备方法中，所述第一溶剂和所述第二溶剂的材料相同。
在本申请实施例所提供的显示面板的功能层的制备方法中，从所述油墨层的中心朝向所述油墨层的边缘的方向上，所述第二溶剂的量逐渐增大。
在本申请实施例所提供的显示面板的功能层的制备方法中，所述油墨层包括中心区域，从所述中心区域朝向所述油墨层的边缘的方向上，所述第二溶剂的量逐渐增大。
在本申请实施例所提供的显示面板的功能层的制备方法中，所述功能层包括空穴注入层、空穴传输层或发光层。
在本申请实施例所提供的显示面板的功能层的制备方法中，所述基板的显示区包括多个子像素区域，所述多个子像素区域呈阵列分布，所述油墨层形成于所述多个子像素区域中；每个子像素区域中单位面积上的溶质的量相同，且靠近所述显示区的边缘的子像素区域中单位面积上的溶剂的量大于靠近所述显示区的中心的子像素区域中单位面积上的溶剂的量。
在本申请实施例所提供的显示面板的功能层的制备方法中，所述基板包括衬底基板、设置在所述衬底基板上的TFT阵列层、间隔设置在所述TFT阵列层上的阳极以及围绕所述阳极设置的像素定义层；其中，所述阳极位于所述显示区，所述像素定义层围绕所述阳极形成所述子像素区域。
在本申请实施例所提供的显示面板的功能层的制备方法中，所述子像素区域包括红色子像素区域、绿色子像素区域和蓝色子像素区域。
本申请实施例还提供了一种显示面板的功能层的制备方法，所述显示面板包括基板，所述制备方法包括以下步骤：
采用喷墨打印技术在所述基板的显示区打印溶解有溶质的第一溶剂；
采用喷墨打印技术在所述溶解有溶质的第一溶剂上打印第二溶剂，以形成油墨层；其中，所述油墨层的不同位置的溶质的量相同，所述油墨层的不同位置的第一溶剂的量相同，且所述油墨层的边缘的第二溶剂的量大于所述油墨层的中心的第二溶剂的量；
蒸发掉所述油墨层中的第一溶剂和第二溶剂，形成膜厚均匀的功能层。
本申请实施例还提供了一种显示面板的制备方法，包括以下步骤：
提供基板；
采用上述的显示面板的功能层的制备方法在所述基板上形成堆叠的多层功能层；所述多层功能层包括依次设置的空穴注入层、空穴传输层和发光层。
在本申请实施例所提供的显示面板的制备方法中，从所述油墨层的中心朝向所述油墨层的边缘的方向上，所述溶剂的量逐渐增大。
在本申请实施例所提供的显示面板的制备方法中，所述油墨层包括中心区域，所述中心区域的不同位置的溶剂的量相同；从所述中心区域朝向所述油墨层的边缘的方向上，所述溶剂的量逐渐增大。
在本申请实施例所提供的显示面板的制备方法中，所述基板的显示区包括多个子像素区域，所述多个子像素区域呈阵列分布，所述多层功能层形成于每个子像素区域中。
在本申请实施例所提供的显示面板的制备方法中，所述基板包括衬底基板、设置在所述衬底基板上的TFT阵列层、间隔设置在所述TFT阵列层上的阳极以及围绕所述阳极设置的像素定义层；其中，所述阳极位于所述显示区，所述像素定义层围绕所述阳极形成所述子像素区域。
 有益效果
本申请的有益效果为：本申请中，在显示面板的基板的显示区，通过喷墨打印技术形成的油墨层中，不同位置的溶质的量相同，且油墨层的边缘的溶剂的量大于油墨层的中心的溶剂的量，使得在蒸发显示区的油墨层中的溶剂时，基板的整个显示区的溶剂气氛浓度大致相同，使得基板的整个油墨层中溶剂的挥发速度大致相同，且避免了因油墨层的边缘的溶剂挥发速度过快而带走部分溶解于溶剂中的溶质，因此，本申请可以制得膜厚均匀的功能层；另外，本申请在保持基板的整个显示区上方的溶剂气氛浓度大致相同的情况下，不会增加不能用于显示的虚拟像素层，在保证形成的功能层厚度均匀的同时，还可以实现显示面板窄边框化。
 附图说明
为了更清楚地说明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单介绍，显而易见地，下面描述中的附图仅仅是申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本申请实施例提供的一种显示面板的功能层的制作方法的流程示意框图；
图2为本申请实施例提供的喷墨打印过程中显示面板的部分截面结构示意图；
图3为本申请实施例提供的一种显示面板的部分截面结构示意图；
图4为本申请实施例提供的一种显示面板的示意图；
图5为本申请实施例提供的另一种显示面板的功能层的制作方法的流程示意框图；
图6为本申请实施例提供的另一种喷墨打印过程中显示面板的部分截面结构示意图；
图7为本申请实施例提供的蓝色子像素区域中打印的第二溶剂的量随蓝色子像素区域距离显示区的中心位置的距离的变化曲线图。
 本发明的实施方式
这里所公开的具体结构和功能细节仅仅是代表性的，并且是用来描述本申请的示例性实施例的目的。但是本申请可以通过许多替换形式来具体实现，并且不应当被解释成仅仅受限于这里所阐述的实施例。
在本申请的描述中，需要理解的是，术语“中心”、“横向”、“上”、“下”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本申请和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。此外，术语“第一”、“第二”仅用来描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个该特征。在本申请的描述中，除非另有说明，“多个”的含义是两个或两个以上。另外，术语“包括”及其任何变形，意图在于覆盖不排他的包含。
在本申请的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通。对于本领域的普通技术人员而言，可以具体情况理解上述术语在本申请中的具体含义。
这里所使用的术语仅仅是为了描述具体实施例而不意图限制示例性实施例。除非上下文明确地另有所指，否则这里所使用的单数形式“一个”、“一项”还意图包括复数。还应当理解的是，这里所使用的术语“包括”和/或“包含”规定所陈述的特征、整数、步骤、操作、单元和/或组件的存在，而不排除存在或添加一个或更多其他特征、整数、步骤、操作、单元、组件和/或其组合。
下面结合附图和实施例对本申请作进一步说明。
如图1至图4所示，本申请实施例提供了一种显示面板的功能层的制备方法，显示面板1包括基板3，如图1所示，显示面板1的功能层2的制备方法包括以下步骤：
S101：采用喷墨打印技术在基板的显示区打印形成油墨层，油墨层包括溶质和溶解溶质的溶剂；其中，油墨层的不同位置的溶质的量相同，且油墨层的边缘的溶剂的量大于油墨层的中心的溶剂的量；
S102：蒸发掉油墨层中的溶剂，形成膜厚均匀的功能层。
具体的，油墨层4的底面积（也就是油墨层4靠近基板3的一侧在基板3上的正投影面积）为显示面板1的发光面积，本申请所有实施例中的溶质5的量均指单位发光面积上的溶质5的量，溶剂6的量均指单位发光面积上的溶剂6的量。
具体的，显示面板1包括有机电致发光显示面板；功能层2包括空穴注入层、空穴传输层或发光层；基板3的显示区15与显示面板1的显示区对应。
具体的，如图2和图3所示，基板3的显示区15包括多个子像素区域7，多个子像素区域7呈阵列分布，油墨层4形成于多个子像素区域7中；每个子像素区域7中单位面积（或者单位底面积，其中底面积为子像素区域7靠近基板3的一侧在基板3上的正投影面积，也就是显示面板1的发光面积）上的溶质5的量相同，且靠近显示区15的边缘的子像素区域7中单位面积上的溶剂6的量大于靠近显示区15的中心的子像素区域7中单位面积上的溶剂6的量。
具体的，当每个子像素区域7的底面积相等时，每个子像素区域7中的溶质5的量相等；当不同的子像素区域7的底面积不同时，不同的子像素区域7中溶质5的总量不同，但是单位底面积上的溶质5的量相同。例如子像素区域7包括红色子像素区域、绿色子像素区域和蓝色子像素区域，对应的形成有红色子像素、绿色子像素和蓝色子像素，由于上述三种子像素的寿命和亮度不同，所以三种子像素（子像素区域）的大小设计的不同，具体表现为三种子像素区域7的底面积大小不同，形成的三种子像素的体积不同，其中蓝色子像素的体积最大；每一个子像素由多层功能层2叠加构成；因此，在保证膜厚均匀的前提下，三种子像素区域7中形成的功能层2的体积不同，但是高度相同，即三种子像素区域7中的溶质5的总量不同，但是单位底面积上的溶质5的量相同。
具体的，如图2和图3所示，显示面板1的基板3包括衬底基板8、设置在衬底基板8上的TFT（Thin Film Transistor，薄膜晶体管）阵列层9以及间隔设置在TFT阵列层9上的阳极10和像素定义层11；其中，阳极10位于显示区15，像素定义层11围绕阳极10形成有子像素区域7。
本实施例中，在显示面板1的基板3的显示区15，通过喷墨打印技术形成的油墨层4中，不同位置的溶质5的量相同，且油墨层4的边缘的溶剂6的量大于油墨层4的中心的溶剂6的量，使得在蒸发显示区15的油墨层4中的溶剂6时，基板3的整个显示区15的溶剂气氛浓度大致相同，使得基板3的整个显示区15上溶剂6的挥发速度大致相同，且避免了因油墨层4的边缘的溶剂6挥发速度过快而带走部分溶解于溶剂6中的溶质5，因此，本实施例可以制得膜厚均匀的功能层2；另外，本实施例在保持基板3的整个显示区15上方的溶剂气氛浓度大致相同的情况下，不会在显示区15周围增加不能用于显示的虚拟像素层，在保证形成的功能层2厚度均匀的同时，还可以实现显示面板1窄边框化。
在一实施例中，从油墨层4的中心朝向油墨层4的边缘的方向上，溶剂6的量逐渐增大。本实施例中，油墨层4中不同位置的溶剂6的量取决于与油墨层4的中心的距离，距离越大，溶剂6越多，使得油墨层4的不同位置的溶剂6在蒸发干燥过程中挥发速度大致相同，有利于实现形成膜厚均匀的功能层2。
如图2所示，本申请实施例还提供一种显示面板的功能层的制备方法，与上述实施例不同的在于，油墨层4包括中心区域12，中心区域12的不同位置的溶剂6的量相同；从中心区域12朝向油墨层4的边缘的方向上，溶剂6的量逐渐增大。
本实施例中，油墨层4的中心区域12的溶剂6挥发速度大致相同，但与油墨层4的边缘的溶剂6挥发速度相比较小，因此，油墨层4的中心区域12的不同位置的溶剂6的量保持相同，从中心区域12朝向油墨层4的边缘的方向上，逐渐增大溶剂6的量，可以减小从中心区域12朝向油墨层4的边缘的方向上的溶剂6的挥发速度，使得油墨层4的不同位置的溶剂6在蒸发干燥过程中挥发速度大致相同，有利于实现形成膜厚均匀的功能层2。
如图5和图6所示，本申请实施例还提供一种显示面板的功能层的制备方法，与上述实施例不同的在于，溶剂6包括第一溶剂13和第二溶剂14； 如图5所示，步骤S101中，采用喷墨打印技术在基板的显示区打印形成油墨层，包括以下步骤：
S501：采用喷墨打印技术在基板的显示区打印溶解有溶质的第一溶剂（第一次喷墨打印）；
S502：采用喷墨打印技术在溶解有溶质的第一溶剂上打印第二溶剂（第二次喷墨打印），以形成油墨层；其中，油墨层的不同位置的第一溶剂的量相同，油墨层的边缘的第二溶剂的量大于油墨层的中心的第二溶剂的量。
具体的，第一溶剂13和第二溶剂14的材料相同。
具体的，第二溶剂14可以在整个显示区15的溶解有溶质5的第一溶剂13上打印，且从油墨层4的中心朝向油墨层4的边缘的方向上，第二溶剂14的量逐渐增大；当然，第二溶剂14也可以在部分显示区15的溶解有溶质5的第一溶剂13上打印，例如，形成的油墨层4包括中心区域12，中心区域12不需要打印第二溶剂14，从中心区域12朝向油墨层4的边缘的方向上，打印的第二溶剂14的量逐渐增大。
本实施例分两次喷墨打印形成油墨层4，为了使形成的功能层2的膜厚均匀，第一次喷墨打印时，在基板3的显示区15的不同位置打印的溶质5的量相同，且不同位置的第一溶剂13的量相同；由于在真空干燥过程中基板3的表面各部分溶剂6挥发的速度不同，显示区15的边缘的溶剂6挥发的速度快于中间部分，边缘的溶剂6容易带走部分溶质5，导致形成的功能层2膜厚不均匀（中间部分较边缘区域厚），严重影响显示面板1的效率；因此，本实施例在第一次喷墨打印后，在打印的溶解有溶质5的第一溶剂13上补充打印第二溶剂14形成油墨层4，且油墨层4的边缘的第二溶剂14的量大于油墨层4的中心的第二溶剂14的量，使得油墨层4的边缘的溶剂总量大于油墨层4的中心的溶剂总量，使得在蒸发显示区15的油墨层4中的溶剂时，基板3的整个显示区15的溶剂气氛浓度大致相同，使得基板3的整个油墨层4上溶剂6的挥发速度大致相同，且避免了因油墨层4的边缘的溶剂6挥发速度过快而带走较多溶质5，因此，本实施例可以制得膜厚均匀的功能层2；另外，本申请在保持基板3的整个显示区15上方的溶剂气氛浓度大致相同的情况下，不会在显示区15周围增加不能用于显示的虚拟像素层，在保证形成的功能层2厚度均匀的同时，还可以实现显示面板1窄边框化。
本申请实施例还提供一种显示面板的功能层的制备方法，与上述实施例不同的在于，功能层2为发光层，油墨层4中的溶质5包括红色（R）发光材料、绿色（G）发光材料和蓝色（B）发光材料，且红色发光材料、绿色发光材料和蓝色发光材料分别打印在不同的子像素区域7内。
具体的，打印有红色发光材料的子像素区域为红色子像素区域，打印有绿色发光材料的子像素区域为绿色子像素区域，打印有蓝色发光材料的子像素区域为蓝色子像素区域；其中，蓝色子像素区域的底面积大于红色子像素区域和绿色子像素区域的底面积；三种子像素区域中形成的发光层的体积不同，但是高度相同，即三种子像素区域中的发光材料（溶质）的总量不同，但是单位底面积上的发光材料的量相同。
具体的，可以通过计算机模拟获得显示区15不同位置的子像素区域7内需要补充打印的第二溶剂14的量。例如，以G4.5H（460×730）显示面板为对象进行模拟计算获得不同位置的蓝色子像素区域中需要打印的第二溶剂14的量：已知显示区15大小为10寸，且第一次喷墨打印时，蓝色子像素区域内打印的溶质5（蓝色发光材料）和第一溶剂13的总量为10.5pl（1 pl=10-9 ml），其中溶质5的含量为20%（第一溶剂13的量为8.4pl，溶质5的量为2.1pl），通过计算机模拟计算得到显示区15的蓝色子像素区域中打印的第二溶剂14的量（y）随蓝色子像素区域距离显示区15的中心位置的距离（x）的变化曲线图，如图7所示，从图中可知，距离显示区15的中心的距离x分别为2cm、4cm、6cm和8cm的蓝色子像素区域中需要打印的第二溶剂14的量y分别约为0.3pl、0.6pl、1.3pl和2.8pl。
具体的，第一溶剂13和第二溶剂14的材料包括丙二醇甲醚醋酸酯或二乙二醇甲乙醚。
若每个子像素区域中单位面积上打印的溶质和溶剂的量均相同，打印后，在真空干燥过程中由于基板的表面各部分溶剂挥发的速度不同（显示区的边缘的溶剂挥发的速度快于中间部分），容易导致形成的发光层膜厚不均匀（中间部分较边缘区域厚），严重影响显示面板的发光效果；本申请实施例在分别溶有红色发光材料、绿色发光材料和蓝色发光材料的第一溶剂13打印完成后，补充打印了第二溶剂14，保证了每个子像素区域中单位面积上的溶质的量相同，且位于显示区15的边缘的子像素区域中单位面积上的溶剂的量多于位于显示区15的中间部分的子像素区域中单位面积上的溶剂的量，使得在真空干燥过程中，显示区15边缘的溶剂的挥发速度与显示区15中间部分的溶剂的挥发速度相当，从而使整个显示区15制得的发光层的膜厚均匀。
如图3和图4所示，本申请实施例还提供了一种显示面板的制备方法，包括以下步骤：
提供基板3；
采用上述显示面板1的功能层2的制备方法在基板3上形成堆叠的多层功能层2；多层功能层2包括依次设置的空穴注入层、空穴传输层和发光层。
具体的，如图3所示，显示面板1包括基板3，基板3包括衬底基板8、设置在衬底基板8上的TFT阵列层9以及间隔设置在TFT阵列层9上的阳极10和像素定义层11；其中，阳极10位于显示区15，像素定义层11围绕阳极10形成有像素开口（即子像素区域7）；多层功能层2形成于像素开口中的阳极10上。
本实施例中，在显示面板1的基板3的显示区15，通过喷墨打印技术形成的油墨层4中，不同位置的溶质5的量相同，且油墨层4的边缘的溶剂6的量大于油墨层4的中心的溶剂6的量，使得在蒸发显示区15的油墨层4中的溶剂6时，基板3的整个显示区15的溶剂气氛浓度大致相同，使得基板3的整个油墨层4上溶剂6的挥发速度大致相同，且避免了因油墨层4的边缘的溶剂6挥发速度过快而带走部分溶解于溶剂6中的溶质5，进而可以形成膜厚均匀的功能层2，保证了显示面板1的发光效率和使用寿命；另外，本申请在保持基板3的整个显示区15上方的溶剂气氛浓度大致相同的情况下，不会在显示区15周围增加不能用于显示的虚拟像素层，在保证形成的功能层2厚度均匀的同时，还可以实现显示面板1窄边框化。
综上所述，虽然本申请已以优选实施例揭露如上，但上述优选实施例并非用以限制本申请，本领域的普通技术人员，在不脱离本申请的精神和范围内，均可作各种更动与润饰，因此本申请的保护范围以权利要求界定的范围为准。

Claims (17)

  1. 一种显示面板的功能层的制备方法，所述显示面板包括基板，所述制备方法包括以下步骤：
    采用喷墨打印技术在所述基板的显示区打印形成油墨层，所述油墨层包括溶质和溶解所述溶质的溶剂；其中，所述油墨层的不同位置的溶质的量相同，且所述油墨层的边缘的溶剂的量大于所述油墨层的中心的溶剂的量；
    蒸发掉所述油墨层中的溶剂，形成膜厚均匀的功能层。
  2. 如权利要求1所述的显示面板的功能层的制备方法，其中，从所述油墨层的中心朝向所述油墨层的边缘的方向上，所述溶剂的量逐渐增大。
  3. 如权利要求1所述的显示面板的功能层的制备方法，其中，所述油墨层包括中心区域，所述中心区域的不同位置的溶剂的量相同；从所述中心区域朝向所述油墨层的边缘的方向上，所述溶剂的量逐渐增大。
  4. 如权利要求1所述的显示面板的功能层的制备方法，其中，所述溶剂包括第一溶剂和第二溶剂；
    所述采用喷墨打印技术在所述基板的显示区打印形成油墨层，包括以下步骤：
    采用喷墨打印技术在所述基板的显示区打印溶解有溶质的第一溶剂；
    采用喷墨打印技术在所述溶解有溶质的第一溶剂上打印第二溶剂，以形成油墨层；其中，所述油墨层的不同位置的第一溶剂的量相同，所述油墨层的边缘的第二溶剂的量大于所述油墨层的中心的第二溶剂的量。
  5. 如权利要求4所述的显示面板的功能层的制备方法，其中，所述第一溶剂和所述第二溶剂的材料相同。
  6. 如权利要求4所述的显示面板的功能层的制备方法，其中，从所述油墨层的中心朝向所述油墨层的边缘的方向上，所述第二溶剂的量逐渐增大。
  7. 如权利要求4所述的显示面板的功能层的制备方法，其中，所述油墨层包括中心区域，从所述中心区域朝向所述油墨层的边缘的方向上，所述第二溶剂的量逐渐增大。
  8. 如权利要求1所述的显示面板的功能层的制备方法，其中，所述功能层包括空穴注入层、空穴传输层或发光层。
  9. 如权利要求1所述的显示面板的功能层的制备方法，其中，所述基板的显示区包括多个子像素区域，所述多个子像素区域呈阵列分布，所述油墨层形成于所述多个子像素区域中；每个子像素区域中单位面积上的溶质的量相同，且靠近所述显示区的边缘的子像素区域中单位面积上的溶剂的量大于靠近所述显示区的中心的子像素区域中单位面积上的溶剂的量。
  10. 如权利要求9所述的显示面板的功能层的制备方法，其中，所述基板包括衬底基板、设置在所述衬底基板上的TFT阵列层、间隔设置在所述TFT阵列层上的阳极以及围绕所述阳极设置的像素定义层；其中，所述阳极位于所述显示区，所述像素定义层围绕所述阳极形成所述子像素区域。
  11. 如权利要求9所述的显示面板的功能层的制备方法，其中，所述子像素区域包括红色子像素区域、绿色子像素区域和蓝色子像素区域。
  12. 一种显示面板的功能层的制备方法，所述显示面板包括基板，所述制备方法包括以下步骤：
    采用喷墨打印技术在所述基板的显示区打印溶解有溶质的第一溶剂；
    采用喷墨打印技术在所述溶解有溶质的第一溶剂上打印第二溶剂，以形成油墨层；其中，所述油墨层的不同位置的溶质的量相同，所述油墨层的不同位置的第一溶剂的量相同，且所述油墨层的边缘的第二溶剂的量大于所述油墨层的中心的第二溶剂的量；
    蒸发掉所述油墨层中的第一溶剂和第二溶剂，形成膜厚均匀的功能层。
  13. 一种显示面板的制备方法，其特征在于，包括以下步骤：
    提供基板；
    采用如权利要求1所述的显示面板的功能层的制备方法在所述基板上形成堆叠的多层功能层；所述多层功能层包括依次设置的空穴注入层、空穴传输层和发光层。
  14. 如权利要求13所述的显示面板的制备方法，其中，从所述油墨层的中心朝向所述油墨层的边缘的方向上，所述溶剂的量逐渐增大。
  15. 如权利要求13所述的显示面板的制备方法，其中，所述油墨层包括中心区域，所述中心区域的不同位置的溶剂的量相同；从所述中心区域朝向所述油墨层的边缘的方向上，所述溶剂的量逐渐增大。
  16. 如权利要求13所述的显示面板的制备方法，其中，所述基板的显示区包括多个子像素区域，所述多个子像素区域呈阵列分布，所述多层功能层形成于每个子像素区域中。
  17. 如权利要求16所述的显示面板的制备方法，其中，所述基板包括衬底基板、设置在所述衬底基板上的TFT阵列层、间隔设置在所述TFT阵列层上的阳极以及围绕所述阳极设置的像素定义层；其中，所述阳极位于所述显示区，所述像素定义层围绕所述阳极形成所述子像素区域。
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