CN114420881A - Display panel, manufacturing method thereof and display device - Google Patents

Display panel, manufacturing method thereof and display device Download PDF

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Publication number
CN114420881A
CN114420881A CN202210027035.9A CN202210027035A CN114420881A CN 114420881 A CN114420881 A CN 114420881A CN 202210027035 A CN202210027035 A CN 202210027035A CN 114420881 A CN114420881 A CN 114420881A
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China
Prior art keywords
pixel
display panel
solvent
openings
opening
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CN202210027035.9A
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CN114420881B (en
Inventor
李文杰
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Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Publication of CN114420881A publication Critical patent/CN114420881A/en
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    • 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
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/84—Passivation; Containers; Encapsulations
    • H10K50/842—Containers
    • H10K50/8426—Peripheral sealing arrangements, e.g. adhesives, sealants
    • 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
    • H10K71/15—Deposition of organic active material using liquid deposition, e.g. spin coating characterised by the solvent used

Abstract

The embodiment of the invention discloses a display panel, a manufacturing method thereof and a display device; the display panel comprises a substrate, an anode layer positioned on one side of the substrate, and a pixel defining layer positioned on one side of the anode layer far away from the substrate, wherein the pixel defining layer comprises a plurality of pixel openings positioned in a luminous region and a plurality of auxiliary openings positioned in a non-luminous region, the pixel openings are arranged corresponding to the anode layer, and the auxiliary openings are positioned between two adjacent pixel openings; according to the invention, the auxiliary opening is arranged, so that the solvent is contained in the process of manufacturing the display panel, the solvent atmosphere is provided, the concentration uniformity of the solvent atmosphere in the drying process is balanced, the appearance uniformity of the dried luminescent material layer is improved, the luminescent uniformity of the display panel is improved, and the display effect is improved.

Description

Display panel, manufacturing method thereof and display device
Technical Field
The invention relates to the field of display, in particular to a display panel, a manufacturing method thereof and a display device.
Background
In recent years, inkjet printing has the advantages of high material utilization rate, low equipment price and the like, and is an optimal way for realizing large-size and low-cost production of an Organic Light Emitting Diode (OLED).
Therefore, a display panel, a method for manufacturing the same, and a display device are needed to solve the above technical problems.
Disclosure of Invention
The invention provides a display panel, a manufacturing method thereof and a display device, which can solve the technical problem that the appearance of a film surface is uneven due to nonuniform concentration of a solvent atmosphere in the current ink drying process.
The present invention provides a display panel including:
a substrate;
an anode layer on one side of the substrate;
the pixel defining layer is positioned on one side, far away from the substrate, of the anode layer and comprises a plurality of pixel openings positioned in a luminous region and a plurality of auxiliary openings positioned in a non-luminous region, and the pixel openings are arranged corresponding to the anode layer;
wherein the auxiliary opening is located between two adjacent pixel openings.
Preferably, the auxiliary opening is further disposed on a side of the pixel opening at the edge of the display panel, which is far away from the center of the display panel.
Preferably, the auxiliary opening has a depth smaller than that of the pixel opening.
Preferably, the ratio of the depth of the auxiliary opening to the depth of the pixel opening is 1:2 to 1: 10/9.
Preferably, the pixel openings are arranged in an array, the openings of the pixel openings are rounded rectangles, and the distance between two corresponding short sides of two adjacent pixel openings is greater than the distance between two corresponding long sides of two adjacent pixel openings; wherein the auxiliary opening is located between two corresponding short sides of two adjacent pixel openings.
Preferably, a short side of the pixel aperture is parallel to a first direction in which the auxiliary apertures are continuously disposed.
Preferably, a redundant luminescent material unit is arranged in the auxiliary opening.
The invention also provides a manufacturing method of the display panel, which comprises the following steps:
providing a substrate;
forming an anode layer on the substrate;
forming a pixel defining material layer on the anode layer and the substrate;
forming a plurality of pixel openings in a light emitting region and a plurality of auxiliary openings in a non-light emitting region on the pixel defining material layer, wherein the pixel openings are arranged corresponding to the anode layer, and the auxiliary openings are positioned between two adjacent pixel openings to form a pixel defining layer;
forming a luminescent material solution comprising a first solvent in the pixel opening and forming a second solvent in the auxiliary opening by using an ink-jet printing technology;
and removing the first solvent by using a drying process to form a luminescent material layer, and removing the second solvent.
Preferably, the forming of the luminescent material solution including the first solvent in the pixel opening by using an inkjet printing technique, and the forming of the second solvent in the auxiliary opening includes: forming a luminescent material solution comprising a first solvent in the pixel opening and forming a redundant luminescent material solution comprising a second solvent in the auxiliary opening by using an ink-jet printing technology; the removing the first solvent by using a drying process to form the luminescent material layer, wherein the removing the second solvent comprises: and removing the first solvent in the pixel opening by using a drying process to form a luminescent material layer, and removing the second solvent in the auxiliary opening to form a redundant luminescent material unit.
The invention also provides a display device, which comprises the display panel and a device main body, wherein the device main body and the display panel are combined into a whole.
The invention has the beneficial effects that: according to the invention, the auxiliary opening is arranged, the solvent is contained in the process of manufacturing the display panel, the solvent atmosphere is provided, the concentration uniformity of the solvent atmosphere in the drying process is balanced, the appearance uniformity of the dried luminescent material layer is improved, the luminescent uniformity of the display panel is improved, and the display effect is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic top view illustrating a first structure of a display panel according to an embodiment of the present invention;
FIG. 2 is a first schematic illustration of the structure of FIG. 1 taken along section C1C 2;
FIG. 3 is a schematic top view illustrating a second structure of a display panel according to an embodiment of the present invention;
FIG. 4 is a schematic top view illustrating a third structure of a display panel according to an embodiment of the invention;
FIG. 5 is a schematic top view illustrating a fourth structure of a display panel according to an embodiment of the invention;
FIG. 6 is a second schematic illustration of the structure of FIG. 1 taken along section C1C 2;
FIG. 7 is a flowchart illustrating a method for fabricating a display panel according to an embodiment of the present invention;
fig. 8A to 8E are schematic diagrams illustrating a first flowchart of a method for manufacturing a display panel according to an embodiment of the invention;
FIG. 9 is a second flowchart illustrating a method for fabricating a display panel according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Furthermore, it should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, and are not intended to limit the present invention. In the present invention, unless otherwise specified, the use of directional terms such as "upper" and "lower" generally means upper and lower in the actual use or operation of the device, particularly in the orientation of the figures of the drawings; while "inner" and "outer" are with respect to the outline of the device.
In recent years, inkjet printing has the advantages of high material utilization rate, low equipment price and the like, and is an optimal way for realizing large-size and low-cost production of an Organic Light Emitting Diode (OLED).
Referring to fig. 1 to 6, an embodiment of the invention provides a display panel 100, including:
a substrate 200;
an anode layer 300 on one side of the substrate 200;
a pixel defining layer 400 located on a side of the anode layer 300 away from the substrate 200, wherein the pixel defining layer 400 includes a plurality of pixel openings 410 located in a light emitting region a and a plurality of auxiliary openings 420 located in a non-light emitting region B, and the pixel openings 410 are disposed corresponding to the anode layer 300;
wherein the auxiliary opening 420 is located between two adjacent pixel openings 410.
According to the invention, the auxiliary opening is arranged, the solvent is contained in the process of manufacturing the display panel, the solvent atmosphere is provided, the concentration uniformity of the solvent atmosphere in the drying process is balanced, the appearance uniformity of the dried luminescent material layer is improved, the luminescent uniformity of the display panel is improved, and the display effect is improved.
The technical solution of the present invention will now be described with reference to specific embodiments.
In this embodiment, referring to fig. 2, the display panel 100 includes a substrate 200, an anode layer 300 disposed on one side of the substrate 200, and a pixel defining layer 400 disposed on one side of the anode layer 300 away from the substrate 200.
In some embodiments, referring to fig. 1 and fig. 2, the pixel defining layer 400 includes a plurality of pixel openings 410 in the light emitting region a and a plurality of auxiliary openings 420 in the non-light emitting region B, wherein the pixel openings 410 are disposed corresponding to the anode layer 300; wherein the auxiliary opening 420 is located between two adjacent pixel openings 410. The pixel opening 410 corresponds to a pixel emitting light, the auxiliary opening 420 is not used for emitting light, the anode layer 300 is exposed by the pixel opening 410, and the anode layer 300 is not exposed by the auxiliary opening 420.
In the process of manufacturing the display panel 100, the auxiliary opening 420 is used for containing a solvent and providing a solvent atmosphere to balance the concentration uniformity of the solvent atmosphere in the drying process, improve the appearance uniformity of the dried light-emitting material layer 510, improve the light-emitting uniformity of the display panel 100, and improve the display effect.
In some embodiments, the display panel 100 further comprises a light emitting material layer 510 positioned in the pixel opening 410, and a cathode layer positioned on the light emitting material layer 510.
In some embodiments, the display panel 100 further includes a hole injection layer and a hole transport layer between the light emitting material layer 510 and the anode layer 300, and the display panel 100 further includes an electron transport layer and an electron injection layer between the light emitting material layer 510 and the cathode layer.
In some embodiments, during the drying process, the light emitting material layer 510 in the pixel opening 410 near the edge of the display panel 100 is more easily volatilized when evaporating a solvent than the pixel opening 410 near the center of the display panel 100, resulting in a greater difference in solvent atmosphere from the surroundings of the pixel opening 410 near the center of the display panel 100.
Referring to fig. 3, the auxiliary opening 420 is further disposed at a side of the pixel opening 410 at the edge of the display panel 100, which is far away from the center of the display panel 100.
The auxiliary openings 420 are not only disposed between two adjacent pixel openings 410, but also disposed outside the outermost pixel opening 410, so as to further increase the concentration of the solvent atmosphere around the peripheral pixel opening 410, and slow down the tendency of solvent evaporation, so as to reduce the difference between the solvent atmosphere around the pixel opening 410 near the edge of the display panel 100 and the solvent atmosphere around the pixel opening 410 near the center of the display panel 100, so as to balance the uniformity of the concentration of the solvent atmosphere during the drying process, improve the uniformity of the appearance of the dried light-emitting material layer 510, improve the uniformity of the light emission of the display panel 100, and improve the display effect.
In some embodiments, the anode layer 300 has its own pattern, and the routing of the anode layer 300 is complicated, and the opening size and the opening depth of the auxiliary opening 420 need to be controlled to avoid connecting the pixel openings 410 or the anode layer 300.
Referring to fig. 2, the depth of the auxiliary opening 420 is smaller than the depth of the pixel opening 410. The depth of the pixel opening 410 may expose the anode layer 300, and the depth of the auxiliary opening 420 is smaller than the depth of the pixel opening 410, so as to prevent the auxiliary opening 420 from exposing the anode layer 300, and prevent the anode layer 300 from being abnormally connected.
In some embodiments, the ratio of the depth of the auxiliary opening 420 to the depth of the pixel opening 410 is 1:2 to 1: 10/9. The depth of the auxiliary opening 420 is not too shallow, which may result in the solvent content of the auxiliary opening 420 being reduced and insufficient to balance the uniformity of the solvent atmosphere concentration during the drying process.
In some embodiments, the ratio of the depth of the auxiliary opening 420 to the depth of the pixel opening 410 is 1: 2.
In some embodiments, the depth of the pixel opening 410 is 1.0um to 3.0 um.
In some embodiments, the depth of the pixel opening 410 is 1.0um, and the depth of the auxiliary opening 420 is 0.5 um.
In some embodiments, referring to fig. 4, the pixel openings 410 are arranged in an array, the openings of the pixel openings 410 are rounded rectangles, a distance between two corresponding short sides of two adjacent pixel openings 410 is greater than a distance between two corresponding long sides of two adjacent pixel openings 410, and the auxiliary opening 420 is located between two corresponding short sides of two adjacent pixel openings 410.
In the top view direction of the display panel 100, the distance between two corresponding long sides of two adjacent pixel openings 410 is small, so that the auxiliary opening 420 is not easily disposed, and the auxiliary opening 420 is disposed between two corresponding short sides of two adjacent pixel openings 410, which is beneficial to disposing the auxiliary opening 420.
In some embodiments, referring to fig. 5, when two rounded corners of the short sides of the rounded rectangle are connected to form a semicircle, the short sides of the rounded rectangle are semicircular.
In some embodiments, referring to fig. 4 and 5, the auxiliary openings 420 may be disposed at intervals or may be disposed continuously.
In some embodiments, referring to fig. 5, the short side of the pixel opening 410 is parallel to a first direction in which the auxiliary openings 420 are continuously disposed. The first direction is parallel to the X-axis direction, the second direction is parallel to the Y-axis, and the second direction is perpendicular to the first direction. In the overlooking direction of the display panel 100, the auxiliary openings 420 in the first direction are continuously arranged, the auxiliary openings 420 in the second direction are arranged at intervals to form the auxiliary openings 420 in a row, a solvent atmosphere providing area of the auxiliary openings 420 is increased, the uniformity of the concentration of a solvent atmosphere in a balanced drying process is enhanced, the uniformity of the appearance of the dried light-emitting material layer 510 is improved, the light-emitting uniformity of the display panel 100 is improved, and the display effect is improved.
In some embodiments, the number density of the auxiliary openings 420 gradually increases in a direction from the center of the display panel 100 to the edge of the display panel 100.
Further increasing the concentration of the solvent atmosphere around the periphery of the pixel opening 410, and slowing down the trend of solvent volatilization and dispersion, so as to reduce the difference between the solvent atmosphere around the pixel opening 410 close to the edge of the display panel 100 and the solvent atmosphere around the pixel opening 410 close to the center of the display panel 100, enhance the uniformity of the concentration of the solvent atmosphere in the balanced drying process, improve the uniformity of the appearance of the dried luminescent material layer 510, improve the uniformity of the luminescence of the display panel 100, and improve the display effect.
In some embodiments, the depth of the auxiliary opening 420 gradually increases in a direction from the center of the display panel 100 to the edge of the display panel 100.
The solvent holding capacity of the auxiliary opening 420 is further improved, the concentration of the solvent atmosphere around the pixel opening 410 is improved at the periphery, and the volatilization and dispersion tendency of the solvent is slowed down, so that the difference between the solvent atmosphere around the pixel opening 410 close to the edge of the display panel 100 and the solvent atmosphere around the pixel opening 410 close to the center of the display panel 100 is reduced, the uniformity of the concentration of the solvent atmosphere in the balanced drying process is enhanced, the uniformity of the appearance of the dried luminescent material layer 510 is improved, the luminescent uniformity of the display panel 100 is improved, and the display effect is improved.
In some embodiments, referring to fig. 6, redundant light-emitting material units 520 are disposed in the auxiliary opening 420.
When the display panel 100 is manufactured, if only the organic solvent is filled in the auxiliary opening 420, the organic solvent in the auxiliary opening 420 is volatilized together during drying, so that the uniformity of the concentration of the solvent atmosphere during the drying process is balanced, and after the drying process, the organic solvent is not present in the auxiliary opening 420.
When the display panel 100 is manufactured, if the auxiliary opening 420 is filled with the luminescent material solution 610, the luminescent material solution 610 also includes an organic solvent, the organic solvent in the auxiliary opening 420 is volatilized together, the uniformity of the concentration of the solvent atmosphere in the drying process is balanced, and after the drying process, the luminescent material remains in the luminescent material solution 610 in the auxiliary opening 420, so that the redundant luminescent material unit 520 is formed.
The redundant light emitting material unit 520 may appropriately fill the auxiliary opening 420 to reduce the step difference between the pixel defining layer 400 and the auxiliary opening 420, and reduce the step difference in the manufacturing process of the encapsulation layer during the subsequent processes such as the formation of the encapsulation layer, thereby improving the coverage rate of the encapsulation layer. Meanwhile, the luminescent material solution 610 is directly filled in the auxiliary opening 420, and a group of printing heads special for printing organic solvent is not required to be added, so that any one or more groups of printing heads of red, green and blue can be used for printing, and the cost is reduced.
In some embodiments, the display panel 100 further includes an encapsulation layer on the cathode layer and the pixel definition layer 400.
In some embodiments, the width of the auxiliary opening 420 gradually increases in a first cross section in a direction from the substrate 200 to the encapsulation layer. In the drying process, the auxiliary opening 420 in an open shape is beneficial to volatilization of the solvent, the concentration uniformity of the solvent atmosphere in the balanced drying process is enhanced, the appearance uniformity of the dried luminescent material layer 510 is improved, the luminescence uniformity of the display panel 100 is improved, and the display effect is improved.
In some embodiments, the pixel definition layer 400 includes a body and a hydrophobic layer surrounding the body. The pixel defining layer 400 has hydrophobicity, so that the light emitting material solution 610 or the solvent can be limited in the pixel opening 410 or the auxiliary opening 420 when the display panel 100 is manufactured, and overflow is avoided.
In some embodiments, the material of the body may be a photoresist and the hydrophobic layer may include free fluorine atoms.
In some embodiments, the surface contact angle of the pixel defining layer 400 is greater than 60 °, and the test solvent used is anisole.
In some embodiments, the anode layer 300 or/and the cathode layer may be made of a metal material, or may be made of transparent tin-doped indium oxide. The anode layer 300 may have a thickness of 70 nm to 90 nm, preferably 80 nm.
In some embodiments, the substrate 200 includes a substrate, an active layer on the substrate, a first insulating layer on the active layer, a gate layer on the first insulating layer, a second insulating layer on the gate layer, a source drain layer on the second insulating layer, and a third insulating layer on the source drain layer.
In some embodiments, the display panel 100 further comprises a polarizing layer on the encapsulation layer, and a flexible cover plate on the polarizing layer.
According to the invention, the auxiliary opening is arranged, the solvent is contained in the process of manufacturing the display panel, the solvent atmosphere is provided, the concentration uniformity of the solvent atmosphere in the drying process is balanced, the appearance uniformity of the dried luminescent material layer is improved, the luminescent uniformity of the display panel is improved, and the display effect is improved.
Referring to fig. 7, an embodiment of the present invention further provides a method for manufacturing a display panel 100, including:
s100, providing a substrate 200;
s200, forming an anode layer 300 on the substrate 200;
s300, forming a pixel definition material layer 401 on the anode layer 300 and the substrate 200;
s400, forming a plurality of pixel openings 410 in a light emitting region a and a plurality of auxiliary openings 420 in a non-light emitting region B on the pixel defining material layer 401, wherein the pixel openings 410 are disposed corresponding to the anode layer 300, and the auxiliary openings 420 are disposed between two adjacent pixel openings 410 to form a pixel defining layer 400;
s500, forming a luminescent material solution 610 including a first solvent in the pixel opening 410 and forming a second solvent 620 in the auxiliary opening 420 by using an inkjet printing technique;
s600, removing the first solvent by using a drying process to form the light emitting material layer 510, and removing the second solvent 620.
According to the invention, the auxiliary opening is arranged, the solvent is contained in the process of manufacturing the display panel, the solvent atmosphere is provided, the concentration uniformity of the solvent atmosphere in the drying process is balanced, the appearance uniformity of the dried luminescent material layer is improved, the luminescent uniformity of the display panel is improved, and the display effect is improved.
The technical solution of the present invention will now be described with reference to specific embodiments.
In this embodiment, the manufacturing method of the display panel 100 includes:
s100, a substrate 200 is provided, please refer to fig. 8A.
In some embodiments, the substrate 200 includes a substrate, an active layer on the substrate, a first insulating layer on the active layer, a gate layer on the first insulating layer, a second insulating layer on the gate layer, a source drain layer on the second insulating layer, and a third insulating layer on the source drain layer.
S200, forming an anode layer 300 on the substrate 200, please refer to fig. 8B.
In some embodiments, step S200 comprises:
and S210, forming a plurality of first openings on the third insulating layer, wherein the first openings expose the source drain layer.
And S220, forming an anode layer 300 on the third insulating layer.
In some embodiments, the anode layer 300 is electrically connected to the source and drain layers through the first via.
S300, forming a pixel defining material layer 401 on the anode layer 300 and the substrate 200, please refer to fig. 8C.
In some embodiments, the pixel defining material layer 401 may be a photoresist material, and the photoresist material may be a positive type resin or a negative type resin, and the positive type resin is taken as an example for description below.
S400, forming a plurality of pixel openings 410 in the light emitting region a and a plurality of auxiliary openings 420 in the non-light emitting region B on the pixel defining material layer 401, wherein the pixel openings 410 are disposed corresponding to the anode layer 300, and the auxiliary openings 420 are disposed between two adjacent pixel openings 410 to form the pixel defining layer 400, as shown in fig. 8D.
In some embodiments, the auxiliary opening 420 and the pixel opening 410 may be formed at a time for the pixel defining material layer 401 by one halftone mask.
In some embodiments, referring to fig. 2, the anode layer 300 has its own pattern, and the routing of the anode layer 300 is complicated, so that the opening size and the opening depth of the auxiliary opening 420 need to be controlled to avoid connecting the pixel opening 410 or the anode layer 300. The auxiliary opening 420 has a depth smaller than that of the pixel opening 410.
In some embodiments, the ratio of the depth of the auxiliary opening 420 to the depth of the pixel opening 410 is 1:2 to 1: 10/9.
In some embodiments, the ratio of the depth of the auxiliary opening 420 to the depth of the pixel opening 410 is 1: 2.
In some embodiments, the depth of the pixel opening 410 is 1.0um to 3.0 um.
In some embodiments, the depth of the pixel opening 410 is 1.0um, and the depth of the auxiliary opening 420 is 0.5 um.
In some embodiments, the pixel openings 410 are arranged in an array, the opening shape of each pixel opening 410 is a rounded rectangle, and the auxiliary openings 420 are located between two corresponding short sides of two adjacent pixel openings 410.
In some embodiments, referring to fig. 4 and 5, the auxiliary openings 420 may be disposed at intervals or may be disposed continuously.
In some embodiments, referring to fig. 5, the short side of the pixel opening 410 is parallel to a first direction in which the auxiliary openings 420 are continuously disposed. The first direction is parallel to the X-axis direction, the second direction is parallel to the Y-axis, and the second direction is perpendicular to the first direction.
In some embodiments, referring to fig. 4, the pixel openings 410 are arranged in an array, the openings of the pixel openings 410 are rounded rectangles, a distance between two corresponding short sides of two adjacent pixel openings 410 is greater than a distance between two corresponding long sides of two adjacent pixel openings 410, and the auxiliary opening 420 is located between two corresponding short sides of two adjacent pixel openings 410.
In the top view direction of the display panel 100, the distance between two corresponding long sides of two adjacent pixel openings 410 is small, so that the auxiliary opening 420 is not easily disposed, and the auxiliary opening 420 is disposed between two corresponding short sides of two adjacent pixel openings 410, which is beneficial to disposing the auxiliary opening 420.
In some embodiments, the number density of the auxiliary openings 420 gradually increases in a direction from the center of the display panel 100 to the edge of the display panel 100.
In some embodiments, the depth of the auxiliary opening 420 gradually increases in a direction from the center of the display panel 100 to the edge of the display panel 100.
S500, forming a luminescent material solution 610 including a first solvent in the pixel opening 410 and forming a second solvent 620 in the auxiliary opening 420 by using an inkjet printing technique, please refer to fig. 8E.
In some embodiments, the first solvent and the second solvent 620 may be the same solvent, just a nomenclature that facilitates distinguishing between the solvents within different openings.
In some embodiments, the first solvent and/or the second solvent 620 may be an organic solvent such as anisole, toluene, isopropanol, and the like.
In some embodiments, different types of solvent carriers may be printed within the auxiliary opening 420, divided into two categories, step 500 including:
s510a, forming a luminescent material solution 610 including a first solvent in the pixel opening 410 and forming a second solvent 620 in the auxiliary opening 420 by using an inkjet printing technique, please refer to fig. 8E.
In some embodiments, step 500 includes:
s510b, forming a luminescent material solution 610 including a first solvent in the pixel opening 410 and forming a redundant luminescent material solution 630 including a second solvent 620 in the auxiliary opening 420 by using an inkjet printing technique, please refer to fig. 9.
S600, removing the first solvent by a drying process to form the light emitting material layer 510, and removing the second solvent 620, please refer to fig. 2 and fig. 6.
In some embodiments, step S600 also corresponds to two configurations according to the fact that step S500 includes two types of printing methods, and step S600 includes:
s610a, removing the first solvent in the pixel opening 410 by a drying process to form a light emitting material layer 510, and removing the second solvent 620 in the auxiliary opening 420, please refer to fig. 2.
In some embodiments, only solvent is printed within the auxiliary opening 420. When the display panel 100 is manufactured, if only the organic solvent is filled in the auxiliary opening 420, the organic solvent in the auxiliary opening 420 is volatilized together during drying, so that the uniformity of the concentration of the solvent atmosphere during the drying process is balanced, and after the drying process, the organic solvent is not present in the auxiliary opening 420.
In some embodiments, step S600 comprises:
s610b, removing the first solvent in the pixel opening 410 to form a light emitting material layer 510, and removing the second solvent 620 in the auxiliary opening 420 to form a redundant light emitting material unit 520 by using a drying process, as shown in fig. 6.
When the display panel 100 is manufactured, if the auxiliary opening 420 is filled with the luminescent material solution 610, the luminescent material solution 610 also includes an organic solvent, the organic solvent in the auxiliary opening 420 is volatilized together, the uniformity of the concentration of the solvent atmosphere in the drying process is balanced, and after the drying process, the luminescent material remains in the luminescent material solution 610 in the auxiliary opening 420, so that the redundant luminescent material unit 520 is formed.
The redundant light emitting material unit 520 may appropriately fill the auxiliary opening 420 to reduce the step difference between the pixel defining layer 400 and the auxiliary opening 420, and reduce the step difference in the manufacturing process of the encapsulation layer during the subsequent processes such as the formation of the encapsulation layer, thereby improving the coverage rate of the encapsulation layer. Meanwhile, the luminescent material solution 610 is directly filled in the auxiliary opening 420, and a group of printing heads special for printing organic solvent is not required to be added, so that any one or more groups of printing heads of red, green and blue can be used for printing, and the cost is reduced.
According to the invention, the auxiliary opening is arranged, the solvent is contained in the process of manufacturing the display panel, the solvent atmosphere is provided, the concentration uniformity of the solvent atmosphere in the drying process is balanced, the appearance uniformity of the dried luminescent material layer is improved, the luminescent uniformity of the display panel is improved, and the display effect is improved.
Referring to fig. 10, an embodiment of the invention further provides a display device 10, including any one of the display panels 100 and the device body 20, where the device body 20 and the display panel 100 are combined into a whole.
Please refer to any one of the embodiments of the display panel 100 and fig. 1 to 6, which will not be described herein.
In this embodiment, the device main body 20 may include a middle frame, a frame adhesive, and the like, and the display device 10 may be a mobile display terminal such as a mobile phone and a tablet, which is not limited herein.
The embodiment of the invention discloses a display panel, a manufacturing method thereof and a display device; the display panel comprises a substrate, an anode layer positioned on one side of the substrate, and a pixel defining layer positioned on one side of the anode layer far away from the substrate, wherein the pixel defining layer comprises a plurality of pixel openings positioned in a luminous region and a plurality of auxiliary openings positioned in a non-luminous region, the pixel openings are arranged corresponding to the anode layer, and the auxiliary openings are positioned between two adjacent pixel openings; according to the invention, the auxiliary opening is arranged, so that the solvent is contained in the process of manufacturing the display panel, the solvent atmosphere is provided, the concentration uniformity of the solvent atmosphere in the drying process is balanced, the appearance uniformity of the dried luminescent material layer is improved, the luminescent uniformity of the display panel is improved, and the display effect is improved.
The display panel, the manufacturing method thereof, and the display device provided in the embodiments of the present invention are described in detail above, and the principles and embodiments of the present invention are explained in this document by applying specific examples, and the description of the embodiments above is only used to help understanding the method and the core idea of the present invention; meanwhile, for those skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims (10)

1. A display panel, comprising:
a substrate;
an anode layer on one side of the substrate;
the pixel defining layer is positioned on one side, far away from the substrate, of the anode layer and comprises a plurality of pixel openings positioned in a luminous region and a plurality of auxiliary openings positioned in a non-luminous region, and the pixel openings are arranged corresponding to the anode layer;
wherein the auxiliary opening is located between two adjacent pixel openings.
2. The display panel according to claim 1, wherein the auxiliary opening is further disposed on a side of the pixel opening at the edge of the display panel away from the center of the display panel.
3. The display panel according to claim 1, wherein a depth of the auxiliary opening is smaller than a depth of the pixel opening.
4. The display panel according to claim 3, wherein a ratio of a depth of the auxiliary opening to a depth of the pixel opening is 1:2 to 1: 10/9.
5. The display panel according to claim 1, wherein the pixel openings are arranged in an array, the openings of the pixel openings are rounded rectangles, and a distance between two corresponding short sides of two adjacent pixel openings is greater than a distance between two corresponding long sides of two adjacent pixel openings;
wherein the auxiliary opening is located between two corresponding short sides of two adjacent pixel openings.
6. The display panel according to claim 5, wherein a short side of the pixel opening is parallel to a first direction in which the auxiliary openings are continuously arranged.
7. The display panel of claim 1, wherein redundant luminescent material units are disposed within the auxiliary opening.
8. A method for manufacturing a display panel is characterized by comprising the following steps:
providing a substrate;
forming an anode layer on the substrate;
forming a pixel defining material layer on the anode layer and the substrate;
forming a plurality of pixel openings in a light emitting region and a plurality of auxiliary openings in a non-light emitting region on the pixel defining material layer, wherein the pixel openings are arranged corresponding to the anode layer, and the auxiliary openings are positioned between two adjacent pixel openings to form a pixel defining layer;
forming a luminescent material solution comprising a first solvent in the pixel opening and forming a second solvent in the auxiliary opening by using an ink-jet printing technology;
and removing the first solvent by using a drying process to form a luminescent material layer, and removing the second solvent.
9. The method according to claim 8, wherein the step of forming a luminescent material solution including a first solvent in the pixel opening by using an inkjet printing technique comprises:
forming a luminescent material solution comprising a first solvent in the pixel opening and forming a redundant luminescent material solution comprising a second solvent in the auxiliary opening by using an ink-jet printing technology;
the removing the first solvent by using a drying process to form the luminescent material layer, wherein the removing the second solvent comprises:
and removing the first solvent in the pixel opening by using a drying process to form a luminescent material layer, and removing the second solvent in the auxiliary opening to form a redundant luminescent material unit.
10. A display device comprising the display panel according to any one of claims 1 to 7 and a device main body, the device main body being integrated with the display panel.
CN202210027035.9A 2022-01-11 2022-01-11 Display panel, manufacturing method thereof and display device Active CN114420881B (en)

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