WO2019184387A1 - 有机发光显示面板及其制作方法、显示装置 - Google Patents

有机发光显示面板及其制作方法、显示装置 Download PDF

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Publication number
WO2019184387A1
WO2019184387A1 PCT/CN2018/115484 CN2018115484W WO2019184387A1 WO 2019184387 A1 WO2019184387 A1 WO 2019184387A1 CN 2018115484 W CN2018115484 W CN 2018115484W WO 2019184387 A1 WO2019184387 A1 WO 2019184387A1
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Prior art keywords
sub
pixel
solvent
area
ink
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Ceased
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PCT/CN2018/115484
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English (en)
French (fr)
Inventor
崔颖
侯文军
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BOE Technology Group Co Ltd
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BOE Technology Group Co Ltd
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Priority to JP2019543982A priority Critical patent/JP7510758B2/ja
Priority to EP18906714.3A priority patent/EP3780108B1/en
Priority to US16/490,109 priority patent/US11038109B2/en
Publication of WO2019184387A1 publication Critical patent/WO2019184387A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H10K59/30—Devices specially adapted for multicolour light emission
    • H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
    • H10K59/352—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels the areas of the RGB subpixels being different
    • 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
    • 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
    • H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
    • H10K71/10—Deposition of organic active material
    • H10K71/16—Deposition of organic active material using physical vapour deposition [PVD], e.g. vacuum deposition or sputtering

Definitions

  • the present disclosure relates to the field of display technologies, and in particular, to an organic light emitting display panel, a method of fabricating the same, and a display device.
  • the inkjet printing technology has the advantages of simple operation, low cost, simple process, easy realization of large size, and the like, and a technique for preparing an organic electroluminescence display device by inkjet printing is widely used.
  • a technique for preparing an organic electroluminescence display device by inkjet printing is widely used.
  • due to the faster evaporation rate of the solvent the problem of uneven film formation is caused.
  • Forming the luminescent layer for the first sub-pixel includes:
  • An ink containing the solvent and the luminescent material corresponding to the first sub-pixel is printed in the first sub-pixel.
  • the light-emitting layer is formed for the first sub-pixel, specifically include:
  • the ink is printed in the sub-pixels having the smallest area.
  • the solvent is printed in at least one sub-pixel other than the sub-pixel having the smallest area, which is not formed in the light-emitting layer, and specifically includes :
  • the solvent is printed in the sub-pixel having the largest area.
  • the solvent is printed in at least one sub-pixel other than the sub-pixel having the smallest area, which is not formed in the light-emitting layer, and specifically includes :
  • the solvent is printed in the second sub-pixel.
  • the first sub-pixel when the first sub-pixel includes all sub-pixels except the sub-pixel having the largest area, the first sub-pixel is formed for the first sub-pixel.
  • the luminescent layer specifically includes:
  • the ink corresponding to each of the first sub-pixels is sequentially printed in the first sub-pixels of different colors.
  • the first sub-pixel when the first sub-pixel includes all sub-pixels except the sub-pixel having the largest area, the first sub-pixel is formed for the first sub-pixel.
  • the luminescent layer specifically includes:
  • the ink corresponding to the first sub-pixel is printed in the first sub-pixel of any color.
  • the printing the solvent and the luminescent material corresponding to the first sub-pixel in the first sub-pixel After the ink also includes:
  • the substrate on which the ink is printed is subjected to a drying film forming process.
  • the method includes:
  • the ink corresponding to the sub-pixel is printed in the sub-pixel where the ink is not printed.
  • the plurality of sub-pixels include a red sub-pixel, a green sub-pixel, and a blue sub-pixel, and an aperture area of the blue sub-pixel is respectively It is larger than the opening area of the red sub-pixel and the opening area of the green sub-pixel.
  • the ink printed on the red sub-pixel and the ink printed on the green sub-pixel include the same solvent.
  • the same solvent is printed in the open area of the blue sub-pixel.
  • the same solvent is a main solvent of the ink in the red sub-pixel, and the The main solvent of the ink.
  • the embodiment of the present disclosure further provides an organic light emitting display panel, wherein the organic light emitting display panel is fabricated by the method for fabricating the organic light emitting display panel provided by any of the above embodiments.
  • the embodiment of the present disclosure further provides a display device, which includes the organic light emitting display panel provided by the above embodiment.
  • FIG. 1 is a flow chart of a method for fabricating an organic light emitting display panel according to an embodiment of the present disclosure
  • FIG. 2 is a flow chart of a specific method for fabricating an illuminating layer of an organic luminescent display panel according to an embodiment of the present disclosure
  • FIG. 3 is a schematic structural diagram of fabricating an organic light emitting display panel according to an embodiment of the present disclosure
  • FIG. 4 is a second flowchart of a method for fabricating an organic light emitting display panel according to an embodiment of the present disclosure
  • FIG. 5 is a third flowchart of a method for fabricating an organic light emitting display panel according to an embodiment of the present disclosure
  • FIG. 6 is a schematic structural diagram of a display device according to an embodiment of the present disclosure.
  • an organic light-emitting display panel produced by inkjet printing generally has a problem that the uniformity of film formation of the light-emitting layer is poor. This is because some of the ink containing the luminescent material is caused by the faster evaporation of the solvent in the ink during the printing process.
  • the light-emitting layer generally includes a red sub-pixel region, a green sub-pixel region, and a blue sub-pixel region.
  • An ink containing a luminescent material such as an ink containing a red luminescent material, an ink containing a green luminescent material, and an ink containing a blue luminescent material, wherein the blue luminescent material has lower luminous efficiency and lifetime than red and green luminescent materials, and therefore,
  • the area of the red and green sub-pixel regions is generally designed to be slightly smaller, and the area of the blue sub-pixel region is slightly designed. Larger, in order to make up for the shortcomings of blue light luminescent materials.
  • the organic light-emitting display panel is fabricated by the inkjet printing method, since the red and green sub-pixel regions are relatively small, the volume of the printed red-and green-emitting material-containing ink is relatively small, so the solvent in the ink. The volatilization is faster, which affects the film formation uniformity of the red and green luminescent materials.
  • the present disclosure proposes a method for fabricating an organic light-emitting display panel, which can slow down the evaporation rate of ink containing red and green luminescent materials without changing the size of the original sub-pixel region, and can be greatly To solve the above problems to a certain extent.
  • the manufacturing method of the organic light emitting display panel includes:
  • a substrate is provided.
  • the substrate is provided with a plurality of sub-pixels arranged in an array, and the areas of the opening regions of the sub-pixels of different colors are not completely the same.
  • the specific type of the substrate is not particularly limited, and those skilled in the art can select according to actual needs.
  • the substrate may be glass.
  • an opening area of each sub-pixel is defined by a pixel defining layer, wherein a specific forming material of the pixel defining layer is not particularly limited, for example, at least a portion of the surface of the pixel defining layer may be formed of a hydrophobic material .
  • the specific formation manner of the pixel defining layer is not particularly limited.
  • the pixel defining layer may include openings arranged in an array, and the plurality of sub-pixels may be formed on the substrate by using the above opening, thereby avoiding different A color mixture occurs between sub-pixels.
  • the areas of the opening regions of the sub-pixels of different colors are not completely the same.
  • a corresponding luminescent material is usually printed in each sub-pixel region, and each luminescent material has different luminous efficiency and lifetime, and thus, a plurality of sub-pixel regions can be made.
  • the area of the sub-pixel corresponding to the luminescent material having a long luminous efficiency and a long lifetime may be set slightly smaller, and the sub-pixel area corresponding to the luminescent material having a shorter luminous efficiency and a shorter lifetime may be set slightly larger.
  • the pixel defining layer 200 defines a plurality of sub-pixel regions on a substrate (not shown), and the plurality of sub-pixel regions may include a red sub-pixel region R
  • the green sub-pixel region G and the blue sub-pixel region B have an area larger than an area of the red sub-pixel region R and the green sub-pixel region G.
  • an ink containing a red light emitting material, an ink containing a green light emitting material, and an ink containing a blue light emitting material may be separately printed in each sub-pixel region, wherein the blue light emitting material has lower luminous efficiency and lifetime.
  • Red and green light-emitting materials are generally designed to be slightly smaller, and the area of the blue sub-pixel region is slightly larger. In order to make up for the shortcomings of blue light-emitting materials.
  • the area of the red sub-pixel region and the area of the green sub-pixel region may be the same or different.
  • S102 sequentially forming a light emitting layer in an open area of the sub-pixels of different colors, wherein at least one sub-pixel except the largest area sub-pixel is the first sub-pixel, and the other sub-pixels except the first sub-pixel are the second sub-pixel .
  • the step S102 specifically includes:
  • the method of fabricating the organic light emitting display panel provided by the embodiment of the present disclosure, by printing a solvent corresponding to a sub-pixel having a small sub-area in an opening area of a sub-pixel having a large area, a sub-pixel is formed in a smaller area.
  • the solvent printed in the sub-pixel of a larger area can provide a solvent atmosphere for the sub-pixel of a smaller area, and the film formation of the sub-pixel of a smaller area is uniform.
  • the larger area sub-pixel may be the largest area sub-pixel and/or the sub-large area sub-pixel, and the smaller area sub-pixel may be the minimum area.
  • Sub-pixels of sub-pixels and/or sub-small areas, and sub-pixels providing a solvent atmosphere for other sub-pixels should not form a light-emitting layer to avoid affecting the film formation uniformity of the light-emitting layer in the sub-pixel.
  • forming the light-emitting layer for the first sub-pixel includes:
  • the organic light emitting display panel includes three sub-pixels: a red sub-pixel, a green sub-pixel, and a blue sub-pixel, wherein the area of the red sub-pixel is In S1, the area of the green sub-pixel is S2, the area of the blue sub-pixel is S3, and S1 ⁇ S2 ⁇ S3.
  • the first sub-pixel is a red sub-pixel
  • the second sub-pixel corresponding thereto may be a green sub-pixel and a blue sub-pixel.
  • the green sub-pixel and/or the blue sub-pixel may be printed.
  • the solvent corresponding to the red sub-pixel provides a solvent atmosphere for the red sub-pixel when the red light-emitting layer is formed to reduce the evaporation rate of the solvent in the red sub-pixel, thereby forming the light-emitting layer of the red sub-pixel into a uniform film.
  • the solvent 10 constituting the ink of the red and green light-emitting materials may be printed in advance in the blue sub-pixel region B. Therefore, the printed solvent 10 can provide a solvent atmosphere for volatilization of the ink containing the red and green luminescent materials, thereby slowing the volatilization speed of the ink containing the red and green luminescent materials, and improving the formation in the red and green sub-pixel regions.
  • Membrane uniformity As shown in (b) of FIG. 3, the solvent 10 constituting the ink of the red and green light-emitting materials may be printed in advance in the blue sub-pixel region B. Therefore, the printed solvent 10 can provide a solvent atmosphere for volatilization of the ink containing the red and green luminescent materials, thereby slowing the volatilization speed of the ink containing the red and green luminescent materials, and improving the formation in the red and green sub-pixel regions.
  • Membrane uniformity the solvent 10 constituting the ink of the red and green light-emitting materials may be printed
  • the solvent when the area of the red sub-pixel region is larger than the area of the green sub-pixel region, the solvent may be printed in advance in the blue sub-pixel region and the red sub-pixel region, whereby the solvent of the printing may be The volatilization of the ink of the subsequent green light-emitting material provides a solvent atmosphere, and the film formation uniformity in the green sub-pixel region is improved.
  • the solvent when the area of the green sub-pixel region is larger than the area of the red sub-pixel region, the solvent may be printed in the blue sub-pixel region and the green sub-pixel region in advance, whereby the solvent of the printing may be a subsequent red light emitting material.
  • the volatilization of the ink provides a solvent atmosphere that improves film formation uniformity in the red sub-pixel region.
  • the solvent can be printed in a sub-pixel region other than the sub-pixel region having the smallest area, so that the solvent in the sub-pixel region having the smallest area can be provided with a better solvent volatilization atmosphere as much as possible.
  • the film formation uniformity in the sub-pixel region with the smallest area is improved, and the display quality of the entire OLED is improved.
  • the specific type of the solvent is not particularly limited, and may be a single solvent or a mixed solvent, and those skilled in the art may select according to specific needs.
  • the ink containing the luminescent material is printed on the substrate formed on the front surface to form the luminescent layer based on the pixel defining layer.
  • the ink includes a luminescent material, and a solvent that can dissolve the luminescent material. After the subsequent drying treatment, the solvent in the ink evaporates, and the remaining luminescent material can form a light-emitting layer.
  • the specific types of the luminescent material and the solvent for dissolving the luminescent material are not particularly limited, and those skilled in the art can select according to actual needs.
  • ink printed in a red sub-pixel region ie, ink 110 containing a red light-emitting material
  • ink printed in a green sub-pixel region ie, ink 120 containing a green light-emitting material
  • the specific components are not particularly limited, and those skilled in the art can select according to actual needs.
  • printing the solvent in the at least one sub-pixel that does not form the light-emitting layer except the sub-pixel having the smallest area specifically includes:
  • the solvent is printed in the sub-pixel having the largest area.
  • the organic light emitting display panel includes three sub-pixels: a red sub-pixel, a green sub-pixel, and a blue sub-pixel, wherein the area of the red sub-pixel is In S1, the area of the green sub-pixel is S2, the area of the blue sub-pixel is S3, and S1 ⁇ S2 ⁇ S3.
  • the red sub-pixel is the first sub-pixel and the light-emitting layer is not formed in the blue sub-pixel of the largest area, since the area of the blue sub-pixel is the largest, a sufficient solvent atmosphere can be provided when forming the light-emitting layer corresponding to the red sub-pixel.
  • the solvent corresponding to the red sub-pixel is printed in the blue sub-pixel to provide a solvent atmosphere for the red sub-pixel, and the film formation uniformity of the light formed by the red sub-pixel is ensured.
  • printing the solvent in the at least one sub-pixel that does not form the light-emitting layer except the sub-pixel having the smallest area specifically includes:
  • the solvent is printed in the second sub-pixel.
  • the organic light emitting display panel includes three sub-pixels: a red sub-pixel, a green sub-pixel, and a blue sub-pixel, wherein the area of the red sub-pixel is In S1, the area of the green sub-pixel is S2, the area of the blue sub-pixel is S3, and S1 ⁇ S2 ⁇ S3.
  • the solvent corresponding to the red sub-pixel may be printed in both the green sub-pixel and the blue sub-pixel to form the light-emitting layer corresponding to the red sub-pixel. Provide ample solvent atmosphere.
  • the light-emitting layer is formed for the first sub-pixel, specifically including :
  • the ink corresponding to each of the first sub-pixels is sequentially printed in the first sub-pixels of different colors.
  • the organic light emitting display panel includes three sub-pixels: a red sub-pixel, a green sub-pixel, and a blue sub-pixel, wherein the area of the red sub-pixel is In S1, the area of the green sub-pixel is S2, the area of the blue sub-pixel is S3, and S1 ⁇ S2 ⁇ S3.
  • the second sub-pixel is a blue sub-pixel
  • the solvent corresponding to the red sub-pixel is printed in the blue sub-pixel, forming a green color
  • the solvent corresponding to the green sub-pixel is printed in the blue sub-pixel, wherein the sub-pixel regions of different colors respectively print the ink corresponding to the sub-pixel region.
  • the sub-pixel area area is the largest blue sub-pixel area B, and the red sub-pixel area R and the green sub-pixel area G are equal, then the blue sub-pixel area B is printed.
  • the ink 110 containing the corresponding luminescent material and solvent is printed in the red sub-pixel region R, and then the ink containing the corresponding luminescent material and solvent is printed in the green sub-pixel region G. 120.
  • the ink 110 containing the red light-emitting material and the ink 120 containing the green light-emitting material are in a solvent atmosphere provided in advance from the start of printing, and therefore, the volatilization speed is slow and the film formation uniformity is good.
  • the order in which the red sub-pixel region R and the green sub-pixel region G are printed may be interchanged, and is not specifically limited herein.
  • the light-emitting layer is formed for the first sub-pixel, specifically including :
  • the ink corresponding to the first sub-pixel is printed in the first sub-pixel of any color.
  • the organic light emitting display panel includes three sub-pixels: a red sub-pixel, a green sub-pixel, and a blue sub-pixel, wherein the area of the red sub-pixel is In S1, the area of the green sub-pixel is S2, the area of the blue sub-pixel is S3, and S1 ⁇ S2 ⁇ S3.
  • the second sub-pixel is a blue sub-pixel
  • the main solvent common to the red sub-pixel and the green sub-pixel ink can be printed in the blue sub-pixel, Since the solvent atmosphere is provided for the red sub-pixel and the blue sub-pixel, the corresponding ink can be printed in any color of the red sub-pixel or the blue sub-pixel, and the film formation uniformity of the light-emitting layer of the sub-pixel corresponding to the color can be improved.
  • the method further includes:
  • the substrate on which the ink is printed is subjected to a dry film formation process.
  • the substrate on which the preceding solvent and ink are printed is subjected to a dry film formation process.
  • a relatively uniform light-emitting layer can be obtained by the dry film formation process, and the solvent previously printed in the area of the sub-pixel region having a larger area can be completely volatilized, facilitating subsequent sub-pixel regions having a larger area. Print the corresponding luminescent material.
  • the substrate 10 on which the light-emitting layer ink is printed, the ink 110 containing the red light-emitting material, and the ink 120 containing the green light-emitting material may be subjected to a drying film formation process, whereby A red luminescent layer and a green luminescent layer which are relatively uniform in film formation are obtained. Further, as shown in (d) of FIG. 3, by the dry film forming process, the solvent previously printed in the blue sub-pixel region can be completely volatilized, thereby facilitating subsequent printing of the corresponding luminescent material in the blue sub-pixel region.
  • the ink of the sub-pixel area having a small area (such as the red sub-pixel area and the green sub-pixel area shown above) is volatilized faster, the defect of film formation unevenness is more obvious, and therefore, the sub-pixel having a smaller area can be firstly performed.
  • Preparation of a luminescent layer in the region That is, the step of printing and drying the luminescent material in the sub-pixel region having a small area is provided before the step of arranging the luminescent material in the sub-pixel region having a large printing area, thereby facilitating further improvement of the luminescent layer in the sub-pixel region of the small area.
  • the level of flatness is provided before the step of arranging the luminescent material in the sub-pixel region having a large printing area, thereby facilitating further improvement of the luminescent layer in the sub-pixel region of the small area.
  • the method includes:
  • the corresponding ink in the sub-pixel is printed in the sub-pixel where the ink is not printed.
  • the ink corresponding to the sub-pixel region is printed in the sub-pixel region where the ink is not printed, and specifically includes, for example, the area of the blue sub-pixel region is the largest, and the green sub- The area of the pixel is second, the area of the red sub-pixel area is the smallest, the solvent corresponding to the red sub-pixel is printed in the blue sub-pixel area and the green sub-pixel area, and the ink is printed only in the red sub-pixel area, and the film forming process is performed. Thereafter, the corresponding ink is printed in the blue sub-pixel area and the green sub-pixel area, respectively. As shown in (e) of FIG.
  • the area of the sub-pixel area having the largest area is the blue sub-pixel area B, the red sub-pixel area R and the green sub-pixel area G are equal, and the solvent is printed only in the blue sub-pixel area B.
  • the ink 130 containing the blue light-emitting material may be printed in the blue sub-pixel region B to form a blue light-emitting layer by subsequent processing. Further, a light-emitting layer of the OLED is formed.
  • the method may further include the following steps:
  • the plurality of sub-pixels include a red sub-pixel, a green sub-pixel, and a blue sub-pixel, and an open area of the blue sub-pixel is greater than a red sub-pixel, respectively.
  • the opening area and the opening area of the green sub-pixel are not limited to a red sub-pixel, respectively.
  • the luminous efficiency and the service life of the luminescent material corresponding to the blue sub-pixel are not as good as the luminescent materials corresponding to the red sub-pixel and the green sub-pixel.
  • the service life is good, so the area of the blue sub-pixel needs to be larger than the area of the red sub-pixel and the green sub-pixel to ensure that the sub-pixels of each color in the display panel have uniform illumination and service life to improve display quality.
  • the ink printed in the red sub-pixel and the ink printed in the green sub-pixel include the same solvent in the open area of the blue sub-pixel. Print the same solvent inside.
  • the same solvent is the main solvent of the ink in the red sub-pixel, and the main solvent of the ink in the green sub-pixel.
  • the printing in order to further make the ink drying atmosphere in the red and green sub-pixel regions uniform, and reduce the cost of preparing the ink for forming the light-emitting layer, the printing can be performed.
  • the ink used in the red and green sub-pixel regions is the same solvent.
  • the solvent used for the ink 110 containing the red light-emitting material and the ink 120 containing the green light-emitting material may be a single solvent or a mixed solvent. It should be noted that the phrase "same solvent” herein should be understood broadly, that is, when both inks are composed of a single solvent, the solvents of the two may be all the same.
  • the solvents of the two may be partially the same, for example, the solvent having the highest content in the mixed solvent, and the single solvent in the printing ink constituting the other color. the same.
  • the ink 110 containing the red light emitting material and the ink containing the green light emitting material may contain the same main solvent.
  • main solvent is the component having the highest content in the mixed solvent.
  • the method for fabricating the organic luminescent display panel further includes:
  • an ITO anode layer is formed on the front substrate.
  • the thickness of the ITO anode layer and the preparation method are not particularly limited, and those skilled in the art can select as needed.
  • a hole injecting layer is formed on the side of the ITO anode layer away from the substrate.
  • the specific material of the hole injection layer and the manufacturing method are not particularly limited.
  • the hole injection layer material may be printed on the side of the ITO anode layer away from the substrate, followed by drying to form a film, baking, or the like to form a hole injection layer.
  • a hole transport layer is formed.
  • the specific material of the hole transport layer and the manufacturing method thereof are not particularly limited according to the embodiments of the present disclosure.
  • the hole transport layer material may be printed on the side of the hole injection layer away from the ITO anode layer, followed by drying to form a film, baking, or the like to form a hole transport layer.
  • the method may further include the following steps:
  • an electron transport layer is formed on the side of the light-emitting layer away from the hole transport layer.
  • the specific material of the electron transport layer and the manufacturing method thereof are not particularly limited according to the embodiments of the present disclosure.
  • an electron transport layer may be formed by a vapor deposition method on a side of the light-emitting layer away from the hole transport layer.
  • an electron injecting layer is formed on the side of the electron transport layer away from the light emitting layer.
  • a specific material of the electron injecting layer and a manufacturing method are not particularly limited.
  • an electron injecting layer may be formed by an evaporation method on a side of the electron transport layer away from the light emitting layer.
  • a metal cathode is formed on the side of the electron injecting layer away from the electron transporting layer.
  • a specific material of the metal cathode and a manufacturing method are not particularly limited.
  • a metal cathode may be formed by a vapor deposition method on a side of the electron injection layer away from the electron transport layer.
  • the method may further include a packaging step to form an organic light emitting display panel.
  • the present disclosure proposes an organic light emitting display panel.
  • the organic light emitting display panel may be fabricated by the foregoing method. Therefore, the organic light-emitting display panel has all the features and advantages of the organic light-emitting display panel prepared by the method for preparing the organic light-emitting display panel, and details are not described herein.
  • the present disclosure proposes a display device.
  • the display device 1000 may include a front organic light emitting display panel. Therefore, the display device has all the features and advantages of the front organic light-emitting display panel, and details are not described herein.
  • an embodiment of the present disclosure provides an organic light emitting display panel, a manufacturing method thereof, and a display device.
  • the present disclosure provides a method for fabricating an organic light emitting display panel, comprising: providing a substrate on which a plurality of sub-pixels arranged in an array are arranged, and opening areas of the sub-pixels of different colors are provided The areas of the sub-pixels of the different colors are sequentially formed into a light-emitting layer, wherein at least one sub-pixel other than the largest-area sub-pixel is the first sub-pixel, except for the first sub-pixel The other sub-pixel is a second sub-pixel; forming the light-emitting layer for the first sub-pixel, specifically comprising: printing a solvent for dissolving the luminescent material in at least one of the second sub-pixels in which the luminescent layer is not formed Printing ink containing the solvent and the luminescent material corresponding to the first sub-pixel in the first sub-pixel.
  • the ink volatilization speed of other sub-pixel regions with smaller area when printing ink can be slowed down, thereby improving film formation uniformity in other sub-pixel regions with smaller areas, thereby improving the display quality of the OLED.
  • the description of the terms “one embodiment”, “another embodiment” or the like means that the specific features, structures, materials or characteristics described in connection with the embodiments are included in at least one embodiment of the present disclosure. .
  • the schematic representation of the above terms is not necessarily directed to the same embodiment or example.
  • the particular features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.
  • various embodiments or examples described in the specification, as well as features of various embodiments or examples may be combined and combined.

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Abstract

本公开公开了有机发光显示面板及其制作方法、显示装置。具体的，本公开提出了一种制作有机发光显示面板的方法包括：提供一衬底，依次在不同颜色的子像素的开口区域形成发光层，其中，除最大面积子像素以外的至少一个子像素为第一子像素，除第一子像素外的其他子像素为第二子像素；针对第一子像素形成发光层，具体包括：在未形成发光层的至少一第二子像素内打印用于溶解发光材料的溶剂；在第一子像素内打印含所述溶剂和与第一子像素对应的所述发光材料的墨水。通过该方法可以减慢其他面积较小的子像素区域在打印墨水时的墨水挥发速度，从而提高了其他面积较小的子像素区域内的成膜均匀性，进而提升OLED显示质量。

Description

有机发光显示面板及其制作方法、显示装置
本公开要求在2018年03月28日提交中国专利局、公开号为201810262225.2，公开名称为“有机发光显示面板及其制作方法、显示装置”的中国专利公开的优先权，其全部内容以引入的方式并入本公开中。
技术领域
本公开涉及显示技术领域，尤其涉及有机发光显示面板及其制作方法、显示装置。
背景技术
喷墨打印技术具有操作简单、成本低廉、工艺简单、易于实现大尺寸等优点，利用喷墨打印制备有机电致发光显示装置的技术被广泛应用。但是由于溶剂的挥发速度较快，会导致成膜不均匀的问题。
发明内容
本公开实施例提出的有机发光显示面板的制作方法，其中，包括：
提供一衬底，所述衬底上设置有多个呈阵列排布的子像素，不同颜色的所述子像素的开口区域的面积不完全相同；
依次在不同颜色的所述子像素的开口区域形成发光层，其中，除最大面积子像素以外的至少一个子像素为第一子像素，除所述第一子像素外的其他子像素为第二子像素；
针对所述第一子像素形成所述发光层，具体包括：
在未形成所述发光层的至少一所述第二子像素内打印用于溶解发光材料的溶剂；
在所述第一子像素内打印含所述溶剂和与所述第一子像素对应的所述发光材料的墨水。
可选地，在本公开实施例提供的有机发光显示面板的制作方法中，当所述第一子像素仅包括面积最小的子像素时，针对所述第一子像素形成所述发光层，具体包括：
在除面积最小的所述子像素外的至少一未形成所述发光层的子像素内打印所述溶剂；
在面积最小的所述子像素内打印所述墨水。
可选地，在本公开实施例提供的有机发光显示面板的制作方法中，在除面积最小的所述子像素外的至少一未形成所述发光层的子像素内打印所述溶剂，具体包括：
当面积最大的所述子像素未形成所述发光层时，在面积最大的所述子像素内打印所述溶剂。
可选地，在本公开实施例提供的有机发光显示面板的制作方法中，在除面积最小的所述子像素外的至少一未形成所述发光层的子像素内打印所述溶剂，具体包括：
当所述第二子像素均未形成所述发光层时，在所述第二子像素内均打印所述溶剂。
可选地，在本公开实施例提供的有机发光显示面板的制作方法中，当所述第一子像素包括除面积最大的子像素外的所有子像素时，针对所述第一子像素形成所述发光层，具体包括：
在面积最大的所述子像素内打印所述溶剂；
依次在不同颜色的所述第一子像素内打印各所述第一子像素对应的所述墨水。
可选地，在本公开实施例提供的有机发光显示面板的制作方法中，当所述第一子像素包括除面积最大的子像素外的所有子像素时，针对所述第一子像素形成所述发光层，具体包括：
在面积最大的所述子像素内打印所述溶剂；
在任一颜色的所述第一子像素内打印所述第一子像素对应的所述墨水。
可选地，在本公开实施例提供的有机发光显示面板的制作方法中，所述在所述第一子像素内打印含所述溶剂和与所述第一子像素对应的所述发光材料的墨水之后，还包括：
对打印有所述墨水的所述衬底，进行干燥成膜处理。
可选地，在本公开实施例提供的有机发光显示面板的制作方法中，在所述干燥成膜处理之后，包括：
在未打印所述墨水的所述子像素内打印所述子像素内对应的所述墨水。
可选地，在本公开实施例提供的有机发光显示面板的制作方法中，多个所述子像素包括红色子像素、绿色子像素以及蓝色子像素，所述蓝色子像素的开口面积分别大于所述红色子像素的开口面积和绿色子像素的开口面积。
可选地，在本公开实施例提供的有机发光显示面板的制作方法中，打印在所述红色子像素的所述墨水，以及打印在所述绿色子像素的所述墨水中包含相同的溶剂，在所述蓝色子像素的开口区域内打印所述相同的溶剂。
可选地，在本公开实施例提供的有机发光显示面板的制作方法中，所述相同的溶剂为所述红色子像素中的所述墨水的主溶剂，以及所述绿色子像素中的所述墨水的主溶剂。
本公开实施例还提供了有机发光显示面板，其中，所述有机发光显示面板由上述任一实施例提供的有机发光显示面板的制作方法制作的。
本公开实施例还提供了显示装置，其中，包括上述实施例提供的有机发光显示面板。
附图说明
图1为本公开实施例提供的制作有机发光显示面板的方法流程图之一；
图2为本公开实施例提供的制作有机发光显示面板发光层的具体方法流程图；
图3为本公开实施例提供的制作有机发光显示面板的结构示意图；
图4为本公开实施例提供的制作有机发光显示面板的方法流程图之二；
图5为本公开实施例提供的制作有机发光显示面板的方法流程图之三；
图6为本公开实施例提供的显示装置的结构示意图。
具体实施方式
相关技术中，利用喷墨打印制作的有机发光显示面板，普遍存在发光层成膜均匀性较差的问题。这是由于部分含发光材料的墨水在打印过程中，墨水中的溶剂挥发速度较快造成的。目前的有机发光显示面板，其发光层通常包括红色子像素区域、绿色子像素区域以及蓝色子像素区域，在利用喷墨打印制作有机发光显示面板时，通常在各个子像素区域分别打印对应的含发光材料的墨水，例如含红光发光材料的墨水、含绿光发光材料的墨水以及含蓝光发光材料的墨水，其中，蓝光发光材料的发光效率和寿命不如红、绿光发光材料，因此，如图3中的(a)所示，为了提高有机发光显示面板的整体发光效率和寿命，通常将红、绿色子像素区域的面积设计的稍微小些，蓝色子像素区域的面积设计的稍微大些，以此来弥补蓝光发光材料的不足。在该种情况下，利用喷墨打印法制作有机发光显示面板时，由于红、绿色子像素区域比较小，打印的含红、绿发光材料的墨水的体积也相对较少，故墨水中的溶剂挥发较快，从而会影响红、绿发光材料的成膜均匀性。
针对上述问题，本公开提出了有机发光显示面板的制作方法，能在不改变原有的子像素区域大小的前提下，使得含红、绿发光材料的墨水挥发速度减慢，将能在很大程度上解决上述问题。
下面详细描述本公开的实施例，实施例的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施例是示例性的，仅用于解释本公开，而不能理解为对本公开的限制。
基于此，本公开实施例提供的有机发光显示面板的制作方法，如图1所示，包括：
S101、提供一衬底，衬底上设置有多个呈阵列排布的子像素，不同颜色 的子像素的开口区域的面积不完全相同。
具体地，在本公开实施例提供的有机发光显示面板的制作方法中，衬底的具体类型不受特别限制，本领域技术人员可以根据实际需求进行选择。例如，根据本公开的实施例，衬底可以为玻璃。根据本公开的实施例，各子像素的开口区域由像素界定层进行限定，其中，像素界定层的具体形成材料不受特别限制，例如，像素界定层表面的至少一部分可以是由疏水材料形成的。根据本公开的实施例，像素界定层的具体形成方式均不受特别限制，例如，像素限定层可以包括呈阵列分布的开口，可以利用上述开口在衬底上形成多个子像素，从而可以避免不同子像素之间发生混色。
需要说明的是，在本公开实施例提供的有机发光显示面板的制作方法中，不同颜色的子像素的开口区域的面积不完全相同。如前所述，在利用喷墨打印制作有机发光显示面板时，通常在各子像素区域分别打印对应的发光材料，各发光材料的发光效率和寿命有所不同，因此，可以使多个子像素区域的面积不完全相同，发光效率和寿命较长的发光材料所对应的子像素区域可以设置的稍微小些，发光效率和寿命较短的发光材料所对应的子像素区域可以设置的稍微大些，由此，可以弥补发光效率和寿命较短的发光材料的不足，提升整个OLED的发光效率和寿命。根据本公开的具体实施例，参考图3中的(a)，像素界定层200在衬底(图中未示出)上限定出多个子像素区域，多个子像素区域可以包括红色子像素区域R、绿色子像素区域G以及蓝色子像素区域B，其中，蓝色子像素区域B的面积大于红色子像素区域R、绿色子像素区域G的面积。根据本公开的具体实施例，可以在各个子像素区域分别打印含红光发光材料的墨水、含绿光发光材料的墨水以及含蓝光发光材料的墨水，其中，蓝光发光材料的发光效率和寿命不如红、绿光发光材料，因此，为了提高有机发光显示面板的整体发光效率和寿命，通常将红、绿色子像素区域的面积设计的稍微小些，蓝色子像素区域的面积设计的稍微大些，以此来弥补蓝光发光材料的不足。其中，红色子像素区域的面积与绿色子像素区域的面积可以相同，也可以不同。
S102、依次在不同颜色的子像素的开口区域形成发光层，其中，除最大面积子像素以外的至少一个子像素为第一子像素，除第一子像素外的其他子像素为第二子像素。
具体地，在本公开实施例提供的有机发光显示面板的制作方法中，步骤S102具体包括：
S201、在未形成发光层的至少一第二子像素内打印用于溶解发光材料的溶剂；
S202、在第一子像素内打印含溶剂和与第一子像素对应的发光材料的墨水。
具体地，在本公开实施例提供的有机发光显示面板的制作方法中，通过在面积较大的子像素的开口区域打印子面积较小的子像素对应的溶剂，为在形成较小面积的子像素的发光层时，较大面积的子像素内的打印的溶剂可以为较小面积的子像素提供溶剂气氛，便于较小面积的子像素成膜均匀。
需要说明的是，在显示面板包括三个颜色的子像素时，较大面积的子像素可以是最大面积的子像素和/或次大面积的子像素，较小面积的子像素可以是最小面积的子像素和/或次小面积的子像素，并且为其他子像素提供溶剂气氛的子像素应该未形成发光层，以免对本子像素内的发光层的成膜均匀性产生影响。
可选地，在本公开实施例提供的有机发光显示面板的制作方法中，当第一子像素仅包括面积最小的子像素时，针对第一子像素形成发光层，具体包括：
在除面积最小的子像素外的至少一未形成发光层的子像素内打印溶剂；
在面积最小的子像素内打印墨水。
具体地，在本公开实施例提供的有机发光显示面板的制作方法中，例如该有机发光显示面板包括3个子像素：红色子像素、绿色子像素和蓝色子像素，其中红色子像素的面积为S1，绿色子像素的面积为S2，蓝色子像素的面积为S3，且S1＜S2＜S3。则该第一子像素为红色子像素，与之相对应的第二 子像素可以为绿色子像素和蓝色子像素，在具体实施时，可以向绿色子像素和/或蓝色子像素中打印红色子像素对应的溶剂，在形成红色发光层时为红色子像素提供溶剂气氛，以降低红色子像素内的溶剂的挥发速率，从而使红色子像素的发光层成膜均匀。
例如，如图3中的(b)所示，可以预先在蓝色子像素区域B内打印构成红、绿光发光材料的墨水的溶剂10。由此，该打印的溶剂10可以为后续含有红、绿发光材料的墨水的挥发提供溶剂氛围，进而减慢含有红、绿发光材料的墨水的挥发速度，提高红、绿色子像素区域内的成膜均匀性。根据本公开的一些实施例，红色子像素区域的面积大于绿色子像素区域的面积时，也可以预先在蓝色子像素区域以及红色子像素区域内打印溶剂，由此，该打印的溶剂可以为后续绿光发光材料的墨水的挥发提供溶剂氛围，提高了绿色子像素区域内的成膜均匀性。同样地，绿色子像素区域的面积大于红色子像素区域的面积时，也可以预先在蓝色子像素区域以及绿色子像素区域内打印溶剂，由此，该打印的溶剂可以为后续红光发光材料的墨水的挥发提供溶剂氛围，提高了红色子像素区域内的成膜均匀性。
需要说明的是，子像素区域的面积越小，溶剂挥发越快，成膜均匀性越差，因此，在整个OLED器件中，面积最小的子像素区域内的成膜均匀性往往最差，对OLED整体显示质量的影响最大。根据本公开的另一些实施例，可以在除面积最小的子像素区域之外的子像素区域内打印溶剂，从而可以尽可能地为面积最小的子像素区域内的墨水提供较佳的溶剂挥发氛围，提高面积最小的子像素区域内的成膜均匀性，提升整个OLED的显示质量。根据本公开的实施例，上述溶剂的具体类型不受特别限制，可以为单种溶剂，也可以为混合溶剂，本领域技术人员可以根据具体需要进行选择。
具体地，在本公开实施例提供的有机发光显示面板的制作方法中，在前面所形成的衬底上打印含有发光材料的墨水，以便基于像素界定层形成发光层。根据本公开的实施例，墨水包括发光材料，以及可溶解发光材料的溶剂。通过后续的干燥处理后，墨水中的溶剂挥发，剩余的发光材料可以形成发光 层。根据本公开的实施例，发光材料、溶解发光材料的溶剂的具体类型均不受特别限制，本领域技术人员可以根据实际需求进行选择。
根据本公开的实施例，打印在红色子像素区域内的墨水(即含有红光发光材料的墨水110)，以及打印在绿色子像素区域内的墨水(即含有绿光发光材料的墨水120)的具体成分不受特别限制，本领域技术人员可以根据实际需求进行选择。
可选地，在本公开实施例提供的有机发光显示面板的制作方法中，在除面积最小的子像素外的至少一未形成发光层的子像素内打印溶剂，具体包括：
当面积最大的子像素未形成发光层时，在面积最大的子像素内打印溶剂。
具体地，在本公开实施例提供的有机发光显示面板的制作方法中，例如该有机发光显示面板包括3个子像素：红色子像素、绿色子像素和蓝色子像素，其中红色子像素的面积为S1，绿色子像素的面积为S2，蓝色子像素的面积为S3，且S1＜S2＜S3。当红色子像素为第一子像素，且最大面积的蓝色子像素内未形成发光层时，由于蓝色子像素的面积最大，可以在形成红色子像素对应的发光层时提供充足的溶剂气氛，则首先选择在蓝色子像素内打印红色子像素对应的溶剂，为红色子像素提供溶剂气氛，保证红色子像素所形成的发光的成膜均匀性。
可选地，在本公开实施例提供的有机发光显示面板的制作方法中，在除面积最小的子像素外的至少一未形成发光层的子像素内打印溶剂，具体包括：
当第二子像素均未形成发光层时，在第二子像素内均打印溶剂。
具体地，在本公开实施例提供的有机发光显示面板的制作方法中，例如该有机发光显示面板包括3个子像素：红色子像素、绿色子像素和蓝色子像素，其中红色子像素的面积为S1，绿色子像素的面积为S2，蓝色子像素的面积为S3，且S1＜S2＜S3。当绿色子像素和蓝色子像素内均未形成对应的发光层时，可以在绿色子像素和蓝色子像素内均打印红色子像素对应的溶剂，以在形成红色子像素对应的发光层时提供充足的溶剂气氛。
可选地，在本公开实施例提供的有机发光显示面板的制作方法中，当第 一子像素包括除面积最大的子像素外的所有子像素时，针对第一子像素形成发光层，具体包括：
在面积最大的子像素内打印溶剂；
依次在不同颜色的第一子像素内打印各第一子像素对应的墨水。
具体地，在本公开实施例提供的有机发光显示面板的制作方法中，例如该有机发光显示面板包括3个子像素：红色子像素、绿色子像素和蓝色子像素，其中红色子像素的面积为S1，绿色子像素的面积为S2，蓝色子像素的面积为S3，且S1＜S2＜S3。当第一子像素包括红色子像素和绿色子像素时，则第二子像素为蓝色子像素，在形成红色发光层时，在蓝色子像素中打印红色子像素对应的溶剂，在形成绿色子像素的发光层时，在蓝色子像素中打印绿色子像素对应的溶剂，其中，不同颜色的子像素区域是分别打印与子像素区域对应的墨水的。
当然，也可以如图3中(c)所示，子像素区域面积最大的为蓝色子像素区域B，红色子像素区域R和绿色子像素区域G相等，那么在蓝色子像素区域B打印完红色子像素区域R和绿色子像素区域G对应的溶剂之后，在红色子像素区域R打印含有对应发光材料和溶剂的墨水110，然后在绿色子像素区域G打印含有对应发光材料和溶剂的墨水120，因此，含有红光发光材料的墨水110以及含有绿光发光材料的墨水120从打印开始，就处于预先提供的溶剂氛围中，因此，其挥发速度较慢，成膜均匀性较好。当然红色子像素区域R和绿色子像素区域G打印的顺序可以互换，在此不作具体限定。
可选地，在本公开实施例提供的有机发光显示面板的制作方法中，当第一子像素包括除面积最大的子像素外的所有子像素时，针对第一子像素形成发光层，具体包括：
在面积最大的子像素内打印溶剂；
在任一颜色的第一子像素内打印第一子像素对应的墨水。
具体地，在本公开实施例提供的有机发光显示面板的制作方法中，例如该有机发光显示面板包括3个子像素：红色子像素、绿色子像素和蓝色子像 素，其中红色子像素的面积为S1，绿色子像素的面积为S2，蓝色子像素的面积为S3，且S1＜S2＜S3。当第一子像素包括红色子像素和绿色子像素时，则第二子像素为蓝色子像素，可以在蓝色子像素中打印红色子像素和绿色子像素墨水中共有的主溶剂，可以同时为红色子像素和蓝色子像素提供溶剂氛围，因此可以在红色子像素或蓝色子像素任一颜色内打印对应的墨水，均可以提高对应颜色的子像素的发光层的成膜均匀性。
可选地，在本公开实施例提供的有机发光显示面板的制作方法中，在第一子像素内打印含溶剂和与第一子像素对应的发光材料的墨水之后，还包括：
对打印有墨水的衬底，进行干燥成膜处理。
具体地，在本公开实施例提供的有机发光显示面板的制作方法中，对打印有前面的溶剂和墨水的衬底进行干燥成膜处理。根据本公开的实施例，通过干燥成膜处理，可以获得较为均匀的发光层，并且，预先打印在面积较大的子像素区域内的溶剂可以完全挥发，便于后续在面积较大的子像素区域打印对应的发光材料。根据本公开的具体实施例，可以对上述打印有发光层墨水的溶剂10、含有红光发光材料的墨水110以及含有绿光发光材料的墨水120的衬底进行干燥成膜处理，由此，可以获得成膜较为均匀的红色发光层以及绿色发光层。并且，如图3中的(d)所示，通过该干燥成膜处理，预先打印在蓝色子像素区域内的溶剂可以完全挥发，便于后续在蓝色子像素区域内打印对应的发光材料。由于面积较小的子像素区域(如前面示出的红色子像素区域以及绿色子像素区域)中墨水挥发较快，成膜不均匀的缺陷较为明显，因此，可以首先进行面积较小的子像素区域中的发光层的制备。即：面积较小的子像素区域内发光材料的打印和干燥的步骤，设置在打印面积较大的子像素区域中的发光材料的步骤之前，有利于进一步提高小面积的子像素区域内发光层的平整程度。
可选地，在本公开实施例提供的有机发光显示面板的制作方法中，在干燥成膜处理之后，包括：
在未打印墨水的子像素内打印子像素内对应的墨水。
具体地，在本公开实施例提供的有机电致发光显示面板中，在未打印墨水的子像素区域内打印子像素区域对应的墨水，具体包括，如蓝色子像素区域的面积最大，绿色子像素的面积次之，红色子像素区域的面积最小，在蓝色子像素区域和绿色子像素区域打印红色子像素对应的溶剂，仅在红色子像素区域打印了墨水，则在进行干燥成膜处理后，分别在蓝色子像素区域和绿色子像素区域打印对应的墨水。若如图3中的(e)所示，子像素区域面积最大的为蓝色子像素区域B，红色子像素区域R和绿色子像素区域G相等，仅在蓝色子像素区域B打印溶剂，在绿色子像素区域G和红色子像素区域R打印对应的墨水，进行干燥成膜后，可以在蓝色子像素区域B中打印含有蓝光发光材料的墨水130，以便通过后续处理形成蓝光发光层，进而形成OLED的发光层。需要说明的是，由于蓝色子像素区域B的面积本身比较大，打印在蓝色子像素区域B内的含有蓝光发光材料的墨水130的体积较大，因此，含有蓝光发光材料的墨水130本身打印体积较多，溶剂挥发速度较慢，因此，无需提前设置溶剂氛围，即可获得较佳的成膜均匀性。根据本公开的实施例，参考图4，在面积较大的子像素区域打印溶剂之前，该方法还可以包括以下步骤：
可选地，在本公开实施例提供的有机发光显示面板的制作方法中，多个子像素包括红色子像素、绿色子像素以及蓝色子像素，蓝色子像素的开口面积分别大于红色子像素的开口面积和绿色子像素的开口面积。
具体地，在本公开实施例提供的有机电致发光显示面板中，由于蓝色子像素对应的发光材料的发光效率和使用寿命均不如红色子像素和绿色子像素对应的发光材料的发光效率和使用寿命好，因此需要将蓝色子像素的面积制作的要大于红色子像素和绿色子像素的面积，以保证显示面板中各颜色的子像素的发光和使用寿命比较均一，以提高显示质量。
可选地，在本公开实施例提供的有机发光显示面板的制作方法中，打印在红色子像素的墨水，以及打印在绿色子像素的墨水中包含相同的溶剂，在蓝色子像素的开口区域内打印相同的溶剂。
可选地，在本公开实施例提供的有机发光显示面板的制作方法中，相同的溶剂为红色子像素中的墨水的主溶剂，以及绿色子像素中的墨水的主溶剂。
具体地，在本公开实施例提供的有机发光显示面板的制作方法中，为了进一步令打印在红、绿色子像素区域中的墨水干燥氛围一致，并降低制备形成发光层墨水的成本，可以令打印在红色、绿色子像素区域中的墨水所采用的溶剂相同。含有红光发光材料的墨水110，以及含有绿光发光材料的墨水120所采用的溶剂可以为单一溶剂，也可以为混合溶剂。需要说明的是，此处的“溶剂相同”应作广义理解，即当上述两种墨水均由单一溶剂构成时，二者的溶剂可以全部相同。当二者之一由单一溶剂构成，另一者由混合溶剂构成时，二者的溶剂可以部分相同，例如混合溶剂中含量最多的溶剂，可以和构成另一种颜色的打印墨水中的单一溶剂相同。根据本公开的具体实施例，当上述两种墨水均由混合溶剂构成时，含有红光发光材料的墨水110，以及含有绿光发光材料的墨水120含有的溶剂中的主溶剂可以相同。需要说明的是，术语“主溶剂”即为混合溶剂中含量最高的组分。由此，只需打印一次溶剂，就可为红、绿发光材料提供溶剂挥发氛围，操作简便。
本领域技术人员能够理解的是，上述面积较小的发光层的数量(如前面所示出的红色和绿色两种)以及具体颜色均不受特别限制，上述实施例仅为了解释本公开，而不应当理解为对本公开的限制。
除上述制备个子像素对应的发光层外，本公开实施例提供的有机发光显示面板的制作方法还包括：
S401、在衬底上形成ITO阳极层。
在该步骤中，在前面的衬底上形成ITO阳极层。根据本公开的实施例，ITO阳极层的厚度以及制备方法不受特别限制，本领域技术人员可以根据需要进行选择。
S402、形成空穴注入层。
在该步骤中，在ITO阳极层远离衬底的一侧形成空穴注入层。根据本公开的实施例，空穴注入层的具体材料以及制作方法不受特别限制。具体的， 可以在ITO阳极层远离衬底的一侧打印空穴注入层材料，之后进行干燥成膜、烘烤等操作，以便形成空穴注入层。
S403、形成空穴传输层。
在该步骤中，形成空穴传输层。根据本公开的实施例，空穴传输层的具体材料以及制作方法不受特别限制。具体的，可以在前述空穴注入层远离ITO阳极层的一侧打印空穴传输层材料，之后进行干燥成膜、烘烤等操作，以便形成空穴传输层。
根据本公开的实施例，参考图5，在形成发光层之后，该方法还可以包括以下步骤：
S501、形成电子传输层。
在该步骤中，在发光层远离空穴传输层的一侧形成电子传输层。根据本公开的实施例，电子传输层的具体材料以及制作方法不受特别限制。具体的，可以在前述发光层远离空穴传输层的一侧，通过蒸镀法形成电子传输层。
S502、形成电子注入层。
在该步骤中，在电子传输层远离发光层的一侧形成电子注入层。根据本公开的实施例，电子注入层的具体材料以及制作方法不受特别限制。具体的，可以在前述电子传输层远离发光层的一侧，通过蒸镀法形成电子注入层。
S503、形成金属阴极。
在该步骤中，在电子注入层远离电子传输层的一侧形成金属阴极。根据本公开的实施例，金属阴极的具体材料以及制作方法不受特别限制。具体的，可以在前述电子注入层远离电子传输层的一侧，通过蒸镀法形成金属阴极。
根据本公开的实施例，在上述形成金属阴极的步骤之后，该方法可以进一步包括封装步骤，以便形成有机发光显示面板。
在本公开的另一方面，本公开提出了一种有机发光显示面板。根据本公开的实施例，该有机发光显示面板可以是由前面的方法所制作的。由此，该有机发光显示面板具有前面的制备有机发光显示面板的方法所制备的有机发光显示面板所具有的全部特征以及优点，在此不再赘述。
在本公开的另一方面，本公开提出了一种显示装置。根据本公开的实施例，参考图6，该显示装置1000可以包括前面的有机发光显示面板。由此，该显示装置具有前面的有机发光显示面板所具有的全部特征以及优点，在此不再赘述。
具体地，本公开实施例提供了有机发光显示面板及其制作方法、显示装置。具体的，本公开提出了一种制作有机发光显示面板的方法包括：提供一衬底，所述衬底上设置有多个呈阵列排布的子像素，不同颜色的所述子像素的开口区域的面积不完全相同；依次在不同颜色的所述子像素的开口区域形成发光层，其中，除最大面积子像素以外的至少一个子像素为第一子像素，除所述第一子像素外的其他子像素为第二子像素；针对所述第一子像素形成所述发光层，具体包括：在未形成所述发光层的至少一所述第二子像素内打印用于溶解发光材料的溶剂；在所述第一子像素内打印含所述溶剂和与所述第一子像素对应的所述发光材料的墨水。
通过该方法可以减慢其他面积较小的子像素区域在打印墨水时的墨水挥发速度，从而提高了其他面积较小的子像素区域内的成膜均匀性，进而提升OLED显示质量。
在本公开的描述中，术语“上”、“下”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公开而不是要求本公开必须以特定的方位构造和操作，因此不能理解为对本公开的限制。
在本说明书的描述中，参考术语“一个实施例”、“另一个实施例”等的描述意指结合该实施例描述的具体特征、结构、材料或者特点包含于本公开的至少一个实施例中。在本说明书中，对上述术语的示意性表述不必须针对的是相同的实施例或示例。而且，描述的具体特征、结构、材料或者特点可以在任一个或多个实施例或示例中以合适的方式结合。此外，在不相互矛盾的情况下，本领域的技术人员可以将本说明书中描述的不同实施例或示例以及不同实施例或示例的特征进行结合和组合。
尽管上面已经示出和描述了本公开的实施例，可以理解的是，上述实施 例是示例性的，不能理解为对本公开的限制，本领域的普通技术人员在本公开的范围内可以对上述实施例进行变化、修改、替换和变型。

Claims (13)

  1. 一种有机发光显示面板的制作方法，其中，包括：
    提供一衬底，所述衬底上设置有多个呈阵列排布的子像素，不同颜色的所述子像素的开口区域的面积不完全相同；
    依次在不同颜色的所述子像素的开口区域形成发光层，其中，除最大面积子像素以外的至少一个子像素为第一子像素，除所述第一子像素外的其他子像素为第二子像素；
    针对所述第一子像素形成所述发光层，具体包括：
    在未形成所述发光层的至少一所述第二子像素内打印用于溶解发光材料的溶剂；
    在所述第一子像素内打印含所述溶剂和与所述第一子像素对应的所述发光材料的墨水。
  2. 根据权利要求1所述的方法，其中，当所述第一子像素仅包括面积最小的子像素时，针对所述第一子像素形成所述发光层，具体包括：
    在除面积最小的所述子像素外的至少一未形成所述发光层的子像素内打印所述溶剂；
    在面积最小的所述子像素内打印所述墨水。
  3. 根据权利要求2所述的方法，其中，在除面积最小的所述子像素外的至少一未形成所述发光层的子像素内打印所述溶剂，具体包括：
    当面积最大的所述子像素未形成所述发光层时，在面积最大的所述子像素内打印所述溶剂。
  4. 根据权利要求2所述的方法，其中，在除面积最小的所述子像素外的至少一未形成所述发光层的子像素内打印所述溶剂，具体包括：
    当所述第二子像素均未形成所述发光层时，在所述第二子像素内均打印所述溶剂。
  5. 根据权利要求1所述的方法，其中，当所述第一子像素包括除面积最 大的子像素外的所有子像素时，针对所述第一子像素形成所述发光层，具体包括：
    在面积最大的所述子像素内打印所述溶剂；
    依次在不同颜色的所述第一子像素内打印各所述第一子像素对应的所述墨水。
  6. 根据权利要求1所述的方法，其中，当所述第一子像素包括除面积最大的子像素外的所有子像素时，针对所述第一子像素形成所述发光层，具体包括：
    在面积最大的所述子像素内打印所述溶剂；
    在任一颜色的所述第一子像素内打印所述第一子像素对应的所述墨水。
  7. 根据权利要求1-6任一项所述的方法，其中，所述在所述第一子像素内打印含所述溶剂和与所述第一子像素对应的所述发光材料的墨水之后，还包括：
    对打印有所述墨水的所述衬底，进行干燥成膜处理。
  8. 根据权利要求7所述的方法，其中，在所述干燥成膜处理之后，包括：
    在未打印所述墨水的所述子像素内打印所述子像素内对应的所述墨水。
  9. 根据权利要求1-6任一项所述的方法，其中，多个所述子像素包括红色子像素、绿色子像素以及蓝色子像素，所述蓝色子像素的开口面积分别大于所述红色子像素的开口面积和绿色子像素的开口面积。
  10. 根据权利要求9所述的方法，其中，打印在所述红色子像素的所述墨水，以及打印在所述绿色子像素的所述墨水中包含相同的溶剂，在所述蓝色子像素的开口区域内打印所述相同的溶剂。
  11. 根据权利要求10所述的方法，其中，所述相同的溶剂为所述红色子像素中的所述墨水的主溶剂，以及所述绿色子像素中的所述墨水的主溶剂。
  12. 一种有机发光显示面板，其中，所述有机发光显示面板是由权利要求1-11任一项所述的方法所制作的。
  13. 一种显示装置，其中，包括权利要求12所述的有机发光显示面板。
PCT/CN2018/115484 2018-03-28 2018-11-14 有机发光显示面板及其制作方法、显示装置 Ceased WO2019184387A1 (zh)

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