CN111370586A - Display panel, preparation method thereof and display device - Google Patents
Display panel, preparation method thereof and display device Download PDFInfo
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- CN111370586A CN111370586A CN202010190682.2A CN202010190682A CN111370586A CN 111370586 A CN111370586 A CN 111370586A CN 202010190682 A CN202010190682 A CN 202010190682A CN 111370586 A CN111370586 A CN 111370586A
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- 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
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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
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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
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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
Abstract
The invention provides a display panel, a preparation method of the display panel and a display device, and relates to the technical field of display. The display panel includes: a substrate; the pixel limiting layer is arranged on the substrate and comprises a plurality of pixel limiting units and a plurality of pixel units, the pixel units are positioned between the adjacent pixel limiting units, and the pixel units are filled with functional film layers; a gap is formed between the surface of the part of the pixel defining unit close to one side of the substrate and the surface of the substrate, and part of the functional film layer material in the pixel unit is filled in the gap. According to the invention, the gap is formed between the partial surface of the pixel limiting unit close to one side of the substrate and the surface of the substrate, when the functional film layer is printed by ink jet, ink drops of the functional film layer material fill the gap and generate a capillary force parallel to the substrate in the gap, so that the longitudinal climbing of the functional material on the side wall of the pixel limiting layer is inhibited, and the uniformity of the thickness of the functional film layer formed by ink jet printing is improved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display panel, a preparation method of the display panel and a display device.
Background
At present, the inkjet printing technology is increasingly applied in the process of preparing an Organic Light-Emitting Diode (OLED) display device film. However, the functional film layer prepared by the ink jet printing technology has a problem of poor uniformity.
Therefore, how to improve the uniformity of the film layer prepared by the inkjet printing technology becomes an urgent problem to be solved.
Disclosure of Invention
In view of the above, embodiments of the present invention provide a display panel, a method for manufacturing the display panel, and a display device, so as to solve the problem in the prior art that a film layer manufactured by an inkjet printing technology has poor uniformity.
One aspect of the present invention provides a display panel including: a substrate; the pixel limiting layer is arranged on the substrate and comprises a plurality of pixel limiting units and a plurality of pixel units, the pixel units are positioned between the adjacent pixel limiting units, and the pixel units are filled with functional film layers; a gap is formed between the surface of the part of the pixel defining unit close to one side of the substrate and the surface of the substrate, and part of the functional film layer material in the pixel unit is filled in the gap.
In one embodiment of the invention, the maximum distance from the side of the gap away from the substrate to the substrate is smaller than the thickness of the functional film layer in the direction perpendicular to the substrate.
In one embodiment of the invention, a distance from a side of the gap away from the substrate to the substrate surface gradually increases in a direction approaching the pixel unit.
In one embodiment of the invention, the maximum distance from one side of the gap far away from the substrate to the substrate is 1/10-1/5 of the thickness of the pixel defining unit in the direction vertical to the substrate.
In one embodiment of the present invention, an area of a connection surface of the pixel defining unit with the substrate is not less than 1/4 of a projected area of the pixel defining unit on the substrate surface side near the substrate surface.
In one embodiment of the present invention, a cross-sectional shape of the gap in a direction perpendicular to the substrate is one of a trapezoid, a triangle, and an arch.
In one embodiment of the present invention, a projection of the gap in a single pixel unit on the substrate is one of a circular ring, a rectangular ring, a triangular ring and a diamond ring.
The invention also provides a preparation method of the display panel, which comprises the steps of preparing a pixel defining layer on the substrate through a photoetching process, wherein the pixel defining layer comprises a plurality of pixel defining units and a plurality of pixel units positioned between the adjacent pixel defining units; carrying out high-temperature treatment and reflow on the pixel limiting unit to form a gap, and then carrying out curing treatment, wherein the gap is positioned between the partial surface of the pixel limiting unit close to one side of the substrate and the surface of the substrate; and ink-jet printing a functional film layer material in the pixel unit to form a functional film layer.
In one embodiment of the invention, the pixel defining layer material is a negative photoresist.
A further aspect of the invention provides a display device comprising a display panel as described in any one of the first aspect.
In the embodiment of the invention, a gap is formed between the partial surface of the pixel defining unit close to one side of the substrate and the surface of the substrate, when the functional film layer is printed by ink jet, ink drops of the functional film layer material fill the gap and the pixel unit, so that the gap generates a capillary force parallel to the substrate on the functional material, the longitudinal climbing of the ink drops of the functional material on the side wall of the pixel defining unit is inhibited, and the uniformity of the thickness of the functional film layer formed by ink jet printing is improved.
Drawings
Fig. 1 is a schematic cross-sectional structure diagram of a display panel according to an embodiment of the present invention.
Fig. 2 is a schematic cross-sectional top view of a display panel according to an embodiment of the invention.
Fig. 3 is a schematic cross-sectional structure diagram of a display panel according to an embodiment of the invention.
Fig. 4 is a process diagram of a manufacturing method of a display panel according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of a display device according to an embodiment of the 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. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" as used herein includes both direct and indirect connections (couplings), unless otherwise specified. In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
The functional film layer of the OLED display device is prepared by mixing a functional film layer material and a solvent into ink, spraying the ink into pixel units of a display panel, and performing vacuum drying and baking processes to form the functional film layer. Because the solid content of the functional film layer material in the ink is about 1 percent, the thickness of the functional film layer formed after the ink in the pixel unit is dried by vacuum and baking is 1/10 to/1/15 of the thickness of the ink drop in the pixel unit before drying, but the thickness uniformity of the functional film layer formed after the ink is dried by vacuum and baked is poor due to the serious climbing phenomenon of the ink on the peripheral side walls of the pixel unit when the functional film layer is printed by ink jet, so that the thickness of the edge of the functional film layer is larger than that of the center, and the display effect is influenced. For example, in a red light-emitting pixel, the color of light emission is dark red where the film layer is thick, and light red where the film layer is thin.
Fig. 1 is a schematic diagram of a display panel structure according to an embodiment of the invention. As shown in fig. 1, in one practical embodiment, the display panel includes a substrate 1, a plurality of pixel defining units 3 located on the substrate 1, and a pixel unit 2 located between two adjacent pixel defining units 3, the pixel unit 2 is filled with a functional film 5, a gap 4 formed between a part of the surface of the pixel defining unit 3 near one side of the substrate 1 and the surface of the substrate 1, i.e. a gap between the pixel defining unit 3 and the surface of the substrate 1 in a dashed line frame in fig. 1, and a part of the functional film material is also filled in the gap 4. In the embodiment of the present invention, the functional film layer in the display panel may be one or more of an anode layer, a light emitting layer, a hole transport layer, an electron blocking layer, a light emitting layer, a hole blocking layer, an electron transport layer, and a cathode layer, which may be specifically selected according to actual needs, and only a part of the functional film layer filling the gap is shown in fig. 1 and fig. 3 of the present invention, and other functional film layers are not shown.
According to the display panel provided by the invention, the gap 4 is arranged between the side, close to the substrate 1, of the pixel limiting unit 3 and the substrate 1, in the process of preparing the functional film layer 5 through ink jet printing, the functional film layer material ink drops are printed on the pixel unit 2 and can be filled in the gap 4, so that the part, filled in the gap 4, of the functional film layer material ink drops is subjected to the capillary force parallel to the substrate 1, the functional material ink drops can be inhibited from climbing on the side wall of the pixel limiting unit 4, the thickness uniformity of the functional film layer 5 can be effectively improved, and the display effect of the display panel is improved.
In specific implementation, the distance from the side of the gap 4 far from the substrate 1 to the surface of the substrate 1 is gradually increased along the direction close to the pixel unit 2, so that in the process of ink-jet printing of the functional film layer 5, the functional material ink droplets are easily filled into the gap 4, the functional material ink droplets are promoted to generate a capillary phenomenon at the gap 4, and the capillary force applied to the functional material ink droplets at the gap 4 is enhanced.
Further, in the embodiment of the present invention, the maximum distance from the side of the gap 4 away from the substrate 1 to the surface of the substrate 1, that is, the height of the opening of the gap 4, is 1/10-1/5 of the thickness of the pixel defining unit 3 in the direction perpendicular to the substrate 1. When the opening height of the gap 4 is smaller than 1/10 of the thickness of the pixel defining unit, at this time, the ink drop of the functional film material is difficult to fill the gap 4, the capillary force parallel to the substrate 1 to which the ink drop is subjected is reduced, and the bubble is easily formed at the gap 4, which affects the formation of the functional film; when the opening height of the gap 4 is greater than 1/5 of the thickness of the pixel defining unit 3, the functional film material ink drop cannot generate capillary phenomenon at the gap 4 due to the larger opening height of the gap 4, and the inhibition effect on the longitudinal climbing of the ink drop on the side wall of the pixel defining unit 3 is small, which is not favorable for the uniformity of the thickness of the functional film.
Furthermore, in the embodiment of the invention, the thickness of the pixel defining layer is greater than or equal to 1.3 μm and less than or equal to 2.3 μm, the opening height of the gap 4 is greater than or equal to 0.13 μm and less than or equal to 0.5 μm, the thickness of the functional film layer is ensured to be uniform, the display panel can be thinner and thinner, and the existence of the gap 4 does not affect the strength of the display panel.
In an embodiment of the present invention, the side of the gap 4 away from the surface of the substrate 1 is a lyophilic surface, that is, the side of the gap 4 away from the surface of the substrate 1 is easily wetted by the ink droplet material of the functional film layer, at this time, the ink droplet material more easily enters the gap 4 and fills the gap 4, and meanwhile, the contact between the ink droplet and the surface of the gap 4 is tighter, so that the capillary force applied to the ink droplet in the gap 4 is more obvious, the climbing phenomenon of the ink droplet material on the sidewall of the pixel defining unit is more effectively inhibited, and the formation of the functional film layer with uniform thickness is facilitated.
In one embodiment of the invention, the height of the gap 4 opening does not exceed the thickness of the functional film layer 5. When the functional film layer 5 is printed in the inkjet, the ink droplet reduces along with the volatilization ink droplet volume of solvent in the stoving drying process gradually, if the final thickness of the functional film layer 5 who forms is less than the opening of clearance 4, then the ink droplet height that prints in the ink droplet stoving in-process will be less than the opening height of clearance 4, and the existence of clearance 4 makes the ink droplet material climb toward the upper surface of clearance 4 on the contrary this moment to influence the thickness homogeneity of the functional film layer 5 of final formation.
Preferably, the opening height of the gap 4 is 4/5-9/10 of the thickness of the functional film layer 5, and the capillary force of the ink droplet material at the gap 4 can better inhibit the longitudinal climbing of the ink droplet on the side wall of the pixel defining unit 3, thereby being beneficial to improving the thickness uniformity of the finally formed functional film layer.
In one embodiment of the present invention, the area of the connection surface of the pixel defining unit with the surface of the substrate 1 is not less than 1/4 of the area of the projection of the pixel defining unit near the substrate surface side on the substrate surface, so that the pixel defining unit 2 has a connection surface with a sufficient area with the surface of the substrate 1, so that the pixel defining layer has a sufficient adhesive force with the substrate, thereby ensuring the strength of the display panel on the premise of having a sufficient capillary force between the gap and the functional material droplet.
Further, in one embodiment of the present invention as shown in fig. 2, the width of the gap 4 is the same everywhere, and the width of the gap 4 refers to the distance between the projection of the edge of the gap 4 close to the pixel unit and the edge far from the pixel unit on the substrate, i.e. the distance L1 between the first outer edge 7 and the first inner edge 8 of the gap 4 is the same as the distance L2 between the second inner edge 9 and the second outer edge 10 of the gap 4, and the capillary force of the ink drop received by the gap 4 is the same at different positions of the gap 4, which can further ensure the uniformity of the thickness of the functional film.
Further, the cross-sectional shape of the gap 4 in the direction perpendicular to the substrate 1 is one of a trapezoid, a triangle, and an arch. Specifically, as shown in fig. 1, the cross-sectional shape of the gap 4 is triangular. Preferably, the cross-sectional shape of the gap 4 is an arc shape, and when the functional film material ink drop is filled in the gap 4, the cross-sectional shape has a larger contact area with the gap 4, so that the capillary force applied to the ink drop in the gap 4 is larger, the longitudinal climbing of the ink drop on the side wall of the pixel defining unit can be better inhibited, and the thickness uniformity of the functional film is improved.
In another embodiment of the present invention, the projection of the gap 4 in a single pixel unit on the substrate 1 is one of a circular ring, a rectangular ring, a triangular ring and a diamond ring. As shown in fig. 2 in particular, the projection of the gap 4 onto the substrate 1 is a rectangular ring, which is composed of a first outer edge 7, a second outer edge 10, a first inner edge 8 and a second inner edge 9. Similarly, in other embodiments of the present invention, the projection of the gap 4 may be a circular ring, a rectangular ring, a triangular ring, or a diamond ring, and the shape of the projection may be determined according to actual requirements. At this moment, in a pixel unit, the gap 4 is a continuous gap, surrounds the whole pixel unit, and is not blocked, so that ink droplets can be uniformly filled in the gap pixel unit, the capillary force applied in the gap is the same everywhere, and the functional film layer formed by ink-jet printing has uniform thickness, so that the display panel has a better display effect.
In another embodiment of the present invention, as shown in fig. 3, there is a groove 6 above the gap 4 near the sidewall of the pixel defining layer, the size and shape of the groove 6 are consistent with the shape of the gap 4, the functional material is also filled in the groove 6, when the functional film layer is ink-jet printed, the functional material ink drop is subjected to capillary force in both the groove 6 and the gap 4, and the inhibition effect on the longitudinal climbing of the ink drop on the sidewall of the pixel defining unit is more obvious.
Fig. 4 is a flowchart illustrating a process of a method for manufacturing a display panel according to an embodiment of the present invention. In one embodiment of the present invention as shown in fig. 4, a method for manufacturing a display panel may include the steps of:
step 110: providing a substrate, and preparing a pixel defining layer on the substrate through a photolithography process, wherein the pixel defining layer comprises a plurality of pixel defining units and a plurality of pixel units located between adjacent pixel defining units;
step 120: forming a gap on one side of the pixel defining unit close to the surface of the substrate;
step 130: and ink-jet printing the functional film layer material in the pixel unit to form a functional film layer.
According to the preparation method provided by the embodiment of the invention, in the process of preparing the functional film layer of the display panel by adopting the ink-jet printing process, the gap is formed between the side, close to the surface of the substrate, of the pixel limiting unit and the substrate through etching, and the ink drops of the functional material printed by ink-jet printing can fill the gap, so that the part, filled in the gap, of the ink drops of the functional film layer material is subjected to the capillary force parallel to the substrate, the functional material can be inhibited from climbing on the side wall of the pixel limiting unit, the thickness uniformity of the functional film layer can be effectively improved, and the display effect of.
In the manufacturing method provided by the embodiment of the invention, the step 110 of providing a substrate, and manufacturing a pixel defining layer on the substrate through a photolithography process, wherein the process of the pixel defining layer including a plurality of pixel defining units and a plurality of pixel units located between adjacent pixel defining units includes: coating a layer of negative photoresist on the surface of a substrate, exposing and developing the coated negative photoresist to form a plurality of pixel units, wherein the part of the negative photoresist which is not photoetched is remained to form a pixel limiting unit, and the pixel limiting unit and the pixel units jointly form a pixel limiting layer, wherein the thickness of the formed pixel limiting unit is 1.3-2.2 mu m.
In the manufacturing method provided by the embodiment of the invention, the step 120 of forming the gap on the side of the pixel defining unit close to the substrate surface includes: and heating the side surfaces of the pixel defining units to ensure that the pixel defining layer material is softened and reflowed at high temperature to form gaps, and curing the pixel defining units after the gaps are formed, wherein the cross-sectional shapes of the pixel defining units before the heating treatment of the pixel defining units are inverted trapezoids, namely the widths of the pixel defining layers parallel to the substrate surface are gradually increased in the direction away from the substrate.
In the preparation method provided by the embodiment of the present invention, the step 120 of forming a gap on one side of the pixel defining unit close to the substrate surface may further include: and etching the side of the pixel defining unit close to the surface of the substrate by photoetching, liquid corrosion or other methods to form a gap.
Based on the same inventive concept, an embodiment of the present invention further provides a display device, as shown in fig. 5, which may include: the display panel provided by the embodiment of the invention.
Specifically, the display device may be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, and a navigator. Other essential components of the display device are understood by those skilled in the art, and are not described herein or should not be construed as limiting the invention.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and the like that are within the spirit and principle of the present invention are included in the present invention.
Claims (10)
1. A display panel, comprising:
a substrate;
the pixel limiting layer is arranged on the substrate and comprises a plurality of pixel limiting units and a plurality of pixel units, the pixel units are positioned between the adjacent pixel limiting units, and the pixel units are filled with functional film layers;
a gap is formed between the surface of the part of the pixel defining unit close to one side of the substrate and the surface of the substrate, and part of the functional film layer material in the pixel unit is filled in the gap.
2. The display panel according to claim 1, wherein a maximum distance from a side of the gap away from the substrate to the substrate is smaller than a thickness of the functional film layer in a direction perpendicular to the substrate.
3. The display panel according to claim 2, wherein a distance from a side of the gap away from the substrate to a surface of the substrate gradually increases in a direction approaching the pixel unit.
4. The display panel according to claim 3, wherein a side of the gap away from the substrate has a maximum distance to the substrate of 1/10-1/5 of a thickness of the pixel defining unit in a direction perpendicular to the substrate.
5. The display panel according to claim 4, wherein an area of a connection surface of the pixel defining unit with the substrate is not smaller than 1/4 of a projected area of the pixel defining unit on the substrate surface side near the substrate surface.
6. The display panel according to claim 1, wherein a cross-sectional shape of the gap in a direction perpendicular to the substrate is one of a trapezoid, a triangle, and an arc.
7. The display panel of claim 1, wherein the projection of the gap within a single pixel cell on the substrate is one of a circular ring, a rectangular ring, a triangular ring, and a diamond ring.
8. A method for manufacturing a display panel, comprising:
providing a substrate;
preparing a pixel defining layer on the substrate through a photolithography process, wherein the pixel defining layer includes a plurality of pixel defining units and a plurality of pixel units between adjacent pixel defining units;
carrying out high-temperature treatment and reflow on the pixel limiting unit to form a gap, and then carrying out curing treatment, wherein the gap is positioned between the partial surface of the pixel limiting unit close to one side of the substrate and the surface of the substrate;
and ink-jet printing a functional film layer material in the pixel unit to form a functional film layer.
9. The method of claim 8, wherein the pixel defining layer is made of a negative photoresist.
10. A display device characterized by comprising the display panel according to any one of claims 1 to 7.
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