CN110459583B - Stretchable display panel and manufacturing method thereof - Google Patents

Stretchable display panel and manufacturing method thereof Download PDF

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Publication number
CN110459583B
CN110459583B CN201910803320.3A CN201910803320A CN110459583B CN 110459583 B CN110459583 B CN 110459583B CN 201910803320 A CN201910803320 A CN 201910803320A CN 110459583 B CN110459583 B CN 110459583B
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layer
cathode
light
manufacturing
organic
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CN110459583A (en
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隋凯
孙中元
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BOE Technology Group Co Ltd
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BOE Technology Group Co Ltd
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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/1201—Manufacture or treatment
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/124—Insulating layers formed between TFT elements and OLED elements
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/131—Interconnections, e.g. wiring lines or terminals
    • 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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  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Electroluminescent Light Sources (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

The embodiment of the application provides a display panel and a manufacturing method thereof. The display panel comprises a plurality of display units, a plurality of circuit connecting units and a hollow structure, wherein each display unit comprises a frame area; the display unit comprises a substrate, a first conducting layer comprising a regional power supply cathode, a flattening layer comprising a lapping table and a groove which are positioned in a frame region, and a second conducting layer comprising a cathode lapping structure; the upper surface of the lapping table is an inclined surface, the groove is positioned on one side of the inclined surface of the lapping table, which is inclined downwards, or the upper surface of the lapping table is an arched surface, and the groove is positioned on two sides of the lapping table; the cathode lap joint structure is matched with the upper surface of the lap joint table in shape and is connected with a regional power supply cathode, and a first organic layer formed by dissolving and then solidifying organic materials which are covered on the cathode lap joint structure by mistake is accommodated in the groove. The embodiment of the application can ensure that the cathode lap joint structure and the cathode layer form good lap joint, and improves the production yield of products while not improving the precision.

Description

Stretchable display panel and manufacturing method thereof
Technical Field
The application relates to the technical field of display, in particular to a stretchable display panel and a manufacturing method thereof.
Background
At present, the stretchable display device mostly adopts an island (display unit) bridge (line connection unit) connection mode, and achieves a certain stretching performance through the stretching of a hollow area between the display unit and the line connection unit. The area of each small display unit is very small, and the available space of the frame area of the display unit is also very small, so that the requirement on the lapping precision of the cathode is very high.
At present, due to factors such as errors of processing precision of a Mask plate (Mask), errors caused by manufacturing processes such as unclear Mask, displacement between film layers and the like, errors of alignment precision of equipment and the like, the current equipment and process cannot meet the requirement of high resolution of the stretchable display device, so that the problem that some organic materials are mistakenly covered on the surface of a cathode lap joint structure can easily occur in the manufacturing process of the stretchable display device, the cathode layer and the cathode lap joint structure cannot be lapped, corresponding display units cannot be lightened, and the production yield is reduced.
Disclosure of Invention
The application provides a display panel and a manufacturing method thereof aiming at the defects of the prior art, and aims to solve the technical problem of poor lap joint of a cathode layer and a cathode lap joint structure in a stretchable display panel in the prior art.
In a first aspect, an embodiment of the present application provides a stretchable display panel, including a plurality of display units, a line connection unit connected between the display units, and a hollow structure located between the display units and the line connection unit, where the display units include a display area and a frame area, and the display units include:
a substrate;
the first conducting layer is positioned on the substrate and comprises a regional power supply cathode positioned in the frame area;
the planarization layer covers the first conducting layer and comprises a lapping table and a groove which are positioned in the frame area, wherein the upper surface of the lapping table is an inclined plane, the groove is positioned on one side of the inclined plane of the lapping table, which is inclined downwards, or the upper surface of the lapping table is an arched surface, and the groove is positioned on two sides of the lapping table;
the second conducting layer is positioned on the planarization layer and comprises a cathode lap joint structure which is positioned on the lap joint table and is matched with the shape of the upper surface of the lap joint table, and the cathode lap joint structure is connected with the regional power supply cathode;
the groove is internally provided with a first organic layer, and the first organic layer is formed by dissolving organic materials which are covered on the cathode lap joint structure by mistake, flowing into the groove along the cathode lap joint structure and solidifying.
Optionally, the display region includes opening regions and pixel defining regions between the opening regions, the second conductive layer further includes a plurality of anode units located at the opening regions, and the display panel further includes: the retaining wall is positioned on the planarization layer and positioned in the pixel defining area; the organic light-emitting structure layer comprises a light-emitting functional layer and a light-emitting layer positioned above the anode unit, the light-emitting functional layer comprises a first light-emitting functional layer and/or a second light-emitting functional layer, the first light-emitting functional layer is positioned above the anode unit and the retaining wall, and the second light-emitting functional layer is positioned above the light-emitting layer and the retaining wall; a cathode layer covering the organic light emitting structure layer and the cathode lap joint structure; a packaging structure covering the cathode layer; wherein the material of the first organic layer comprises a material of the first light emitting functional layer and/or a material of the second light emitting functional layer.
Optionally, the first luminescent functional layer comprises: the anode unit comprises a hole injection layer and a hole transport layer, wherein the hole transport layer is positioned on one side, away from the anode unit, of the hole injection layer; the second light emitting functional layer includes: the electron injection layer is arranged on the cathode layer, and the electron transport layer is arranged on one side of the electron injection layer, which is far away from the cathode layer.
Optionally, the first conductive layer further comprises a source electrode and a drain electrode.
Optionally, a second organic layer is further contained within the recess over the first organic layer, the material of the second organic layer comprising a curable organic solvent and a desiccant.
Optionally, the width of the groove is 1 μm to 8 μm, and the depth of the groove is 0.3 μm to 5 μm; the inclination angle of the inclined plane is 20-60 degrees; the arch has a chord length of 20-140 μm and an arch height of 1.5-5 μm.
In a second aspect, an embodiment of the present application provides a method for manufacturing a stretchable display panel, where the display panel includes a plurality of display units, a line connection unit connected between the display units, and a hollow structure located between the display units and the line connection unit, the display units include a display area and a frame area, and the method includes:
providing a substrate, wherein the substrate comprises a plurality of island regions corresponding to the display units, a plurality of wiring regions corresponding to the circuit connection units and a plurality of hollowed-out regions corresponding to the hollowed-out structures;
manufacturing a first conducting layer on the substrate, wherein the first conducting layer comprises a regional power supply cathode located in the frame area;
manufacturing a planarization layer on the first conductive layer, and performing patterning processing on the planarization layer to enable the planarization layer located in the frame area to form a lapping table and a groove, wherein the upper surface of the lapping table is an inclined surface, the groove is located on one side of the lapping table, which is inclined downwards, or the upper surface of the lapping table is an arched surface, and the groove is located on two sides of the lapping table;
manufacturing a second conducting layer on the planarization layer, wherein the second conducting layer comprises a cathode lap joint structure which is positioned on the lap joint table and is matched with the upper surface shape of the lap joint table, and the cathode lap joint structure is connected with the regional power supply cathode;
washing the cathode lapping structure by using an organic washing agent so that organic materials which are mistakenly covered on the cathode lapping structure are dissolved by the organic washing agent and flow into the groove along the cathode lapping structure;
evaporating the organic rinse such that the organic material is solidified within the grooves to form a first organic layer within the grooves.
Optionally, the display region includes an opening region and a pixel defining region located between the opening regions, the second conductive layer further includes a plurality of anode units located in the opening regions, and the manufacturing method further includes:
manufacturing a retaining wall, wherein the retaining wall is positioned on the planarization layer and positioned in the pixel defining area;
manufacturing an organic light emitting structure layer, comprising: manufacturing a light-emitting functional layer and a light-emitting layer on the anode unit, wherein the manufacturing of the light-emitting functional layer comprises the following steps: manufacturing a first light-emitting functional layer and/or manufacturing a second light-emitting functional layer, wherein the first light-emitting functional layer is positioned above the anode unit and the retaining wall, and the second light-emitting functional layer is positioned above the light-emitting layer and the retaining wall;
manufacturing a cathode layer, wherein the cathode layer covers the organic light-emitting structure layer and the cathode lap joint structure;
manufacturing a packaging structure, wherein the packaging structure covers the cathode layer;
wherein the material of the first organic layer comprises the material of the first light emitting functional layer and/or the material of the second light emitting functional layer.
Optionally, the manufacturing of the first light-emitting functional layer includes: manufacturing a hole injection layer, wherein the hole injection layer covers the retaining wall and the anode unit; manufacturing a hole transport layer, wherein the hole transport layer covers the hole injection layer; the manufacturing of the second light-emitting functional layer includes: manufacturing an electron transport layer, wherein the electron transport layer is positioned above the light-emitting layer and the retaining wall; and manufacturing an electron injection layer, wherein the electron injection layer covers the electron transmission layer.
Optionally, the manufacturing method further includes: and printing or spraying an organic solvent doped with a drying agent into the groove and carrying out curing treatment to form a second organic layer on the first organic layer.
The technical scheme provided by the embodiment of the application has the following beneficial technical effects:
according to the display panel and the manufacturing method thereof provided by the embodiment of the application, the cathode lap joint structure is obliquely arranged or designed to be arched and matched with the groove, so that organic materials which are mistakenly covered on the surface of the cathode lap joint structure can flow into the groove after being dissolved, good lap joint between the cathode lap joint structure and the cathode layer is ensured, and the production yield of products is improved while the precision is not improved; the organic material flowing into the groove can be cured without affecting the performance of the display panel; meanwhile, the cathode lapping structure is obliquely arranged or designed to be arched, so that the width of the cathode lapping structure can be reduced while the requirement of the lapping area is ensured, and the width of the frame area can not be increased even if the design of the groove is increased.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram illustrating a partial cross-sectional structure of a stretchable display panel in the related art;
fig. 2 is a schematic diagram of a partial top view structure of a display panel according to an embodiment of the present disclosure;
FIG. 3 is a schematic cross-sectional view of the display panel shown in FIG. 2 along line N-N;
FIG. 4 is a schematic cross-sectional view of the display panel shown in FIG. 2 taken along line N-N;
fig. 5 is a schematic structural diagram of a first light-emitting functional layer in a display panel provided in an embodiment of the present application; fig. 6 is a schematic flowchart illustrating a manufacturing method of a display panel according to an embodiment of the present disclosure;
FIG. 7 is a schematic top view of a substrate according to an embodiment of the present application;
fig. 8 is a schematic flowchart of another method for manufacturing a display panel according to an embodiment of the present disclosure;
fig. 9 is a schematic flowchart of a method for manufacturing a first light-emitting functional layer according to an embodiment of the present disclosure.
Reference numerals:
1-a display unit; 11-a substrate; 12-a first conductive layer; 121-cathode lead; 122-source; 123-drain electrode; 13-a planarization layer; 131-a lap-joint table; 132-a groove; 14-a second conductive layer; 141-cathode lap joint structure; 142-an anode unit; 15-retaining wall; 16-a light-emitting layer; 17-a first light emitting layer functional layer; 18-a cathode layer; 19-a packaging structure;
2-a line connection unit;
3-a hollow structure;
a 1' -island region; a 2' -joining region; 3' -hollowed-out areas;
a-a display area; a 1-open area; a 2-pixel defined area; b-frame area.
Detailed Description
Reference will now be made in detail to the present application, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar parts or parts having the same or similar functions throughout. In addition, if a detailed description of the known art is not necessary for illustrating the features of the present application, it is omitted. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.
It will be understood by those within the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.
The inventor of the present application has found that, in the stretchable display device of the island (display unit) bridge (line connection unit) connection type, since the area of each small display unit is small, the available space of the frame region of the display unit is also small, so that the requirement for the cathode overlapping precision is very high. The alignment precision of the existing equipment can not meet the requirement of high resolution of the stretchable display device, and the problem that some organic materials are mistakenly covered on the surface of the cathode lap joint structure can easily occur, so that the cathode layer and the cathode lap joint structure can not be lapped, and the corresponding display unit can not be lightened.
Specifically, as shown in fig. 1, in the stretchable display device, each display unit includes a display area a and a bezel area B.
Each display unit includes a substrate PI, a source and a drain SD, an Anode unit Anode, a light emitting layer EL RGB, a light emitting functional layer EL COM, a bank PDL, a planarization layer PLN, a regional power supply Cathode VSS, a Cathode lap joint structure Contact, a Cathode layer Cathode, and a packaging structure TFE. The source S and the drain D are arranged on the same layer as the regional power supply cathode 108, the source S and the drain D are positioned in the display area A, and the regional power supply cathode VSS is positioned in the non-display area B; the source S, the drain D and the regional power supply cathode VSS are covered by a planarization layer PLN, an opening area A1 and a pixel defining area A2 are formed after the planarization layer PLN is subjected to patterning treatment, an Anode unit ANode is located in the opening area A1, and a retaining wall PDL is arranged in the pixel defining area A2; the light emitting layer EL RGB is positioned above the Anode Anode, the light emitting function layer EL COM is positioned above the light emitting layer EL RGB and covers the whole display area A, and the Cathode layer Cathode covers the light emitting function layer EL COM and is in Contact lap joint with the Cathode lap joint structure; the encapsulation structure TFE covers the Cathode layer Cathode. Since the available space of the frame area B of each display unit is small, and is usually only 20 μm to 150 μm wide, the difficulty of precision control is increased, and therefore, the cathode overlap structure Contact is easily covered by the light-emitting functional layer EL COM by mistake. Once the Cathode lap joint structure Contact is covered by the light emitting functional layer EL COM, the Cathode layer Cathode and the Cathode lap joint structure Contact fail to lap joint, so that the display unit cannot be lightened, and the yield of production is reduced.
The application provides a display panel and a manufacturing method thereof, which aim to solve the technical problems in the prior art.
The following describes the technical solutions of the present application and how to solve the above technical problems with specific embodiments.
The present embodiment provides a stretchable display panel, as shown in fig. 2, the display panel includes a plurality of display units 1, a line connection unit 2 connected between the display units 1, and a hollow structure 3 located between the display units 1 and the line connection unit 2. As shown in fig. 3, each display unit 1 includes a display area a and a bezel area B. Referring to fig. 4, in the display panel provided in the present embodiment, the display unit 1 includes:
a substrate 11;
a first conductive layer 12 located on the substrate 1 and including a regional power cathode 121 located in the frame region B;
a planarization layer 13 covering the first conductive layer 12, wherein the planarization layer 13 includes a landing pad 131 and a groove 132 in the frame region B, the upper surface of the landing pad 131 is an inclined surface, the groove 132 is located on one side of the inclined surface of the landing pad 131, which is inclined downward, or the upper surface of the landing pad 131 is an arched surface, and the groove 132 is located on both sides of the landing pad 131;
the second conductive layer 14 is positioned on the planarization layer 13 and comprises a cathode lapping structure 141 which is positioned on the lapping table 131 and is matched with the shape of the upper surface of the lapping table 131, and the cathode lapping structure 141 is connected with the negative electrode of the regional power supply;
the groove 132 accommodates the first organic layer F1 therein, and the first organic layer F1 is formed by dissolving the organic material erroneously covering the cathode bridging structure 141, flowing into the groove 132 along the cathode bridging structure 141, and curing the organic material.
According to the display panel provided by the embodiment, the cathode overlapping structure 141 is obliquely arranged or designed to be arched and is matched with the groove 132, so that organic materials which are mistakenly covered on the surface of the cathode overlapping structure 141 can flow into the groove 132 after being dissolved, and thus the cathode overlapping structure 141 and a cathode layer can be well overlapped, and the production yield of products is improved while the precision is not improved; moreover, the organic material flowing into the groove 132 can be cured without affecting the performance of the display panel; meanwhile, the cathode overlapping structure 141 is obliquely arranged or designed to be arched, so that the width of the cathode overlapping structure 141 can be reduced while the requirement of the overlapping area is ensured, and therefore, even if the design of the groove 132 is added, the width of the frame area B cannot be increased.
As shown in fig. 2, the display panel provided by the present application can be stretched because when the display panel is under a tensile force, the hollow structures 3 are deformed under the tensile force, so that the display panel can be stretched. The circuit connection unit 2 includes various traces, such as gate lines, data lines, and a connection line for connecting the negative electrode 132 of the local power source with the power source, and the circuit connection unit 2 is not described in detail herein since it is not the core of the invention of the present application.
It should be noted that the shapes of the display unit 1, the line connection unit 2, and the hollow-out structures 3 shown in fig. 2 are only exemplary, and the shapes of the display unit 1, the line connection unit 2, and the hollow-out structures 3 can be adjusted according to actual situations.
As shown in fig. 3 or 4, the substrate 11 of the display panel provided in the present application may be a Polyimide (PI) film, a Polyethylene (PE) film, a Polypropylene (PP) film, a Polyethylene Terephthalate (PET), or the like. Referring to fig. 2, the area of the substrate 11 corresponding to the hollow structure 3 is designed to be hollow.
As shown in fig. 3 or fig. 4, optionally, the encapsulation structure 18 is a thin film encapsulation structure. By adopting the film package, the display panel can be ensured to have good tensile property, and meanwhile, the package is ensured to have higher water and oxygen corrosion resistance.
Although not shown in fig. 3 and 4, other layers, such as a gate metal layer, a gate insulating layer, an active layer, etc., may be included between the substrate 11 and the first conductive layer 12.
With continued reference to fig. 3 or fig. 4, the display area a includes an opening area a1 and a pixel defining area a2 located between the opening areas, the second conductive layer 14 further includes a plurality of anode units 142 located in the opening areas, and the display panel further includes:
a dam 15, the dam 15 being located on the planarization layer 14 at the pixel defining region a 2;
an organic light emitting structure layer 16 including a light emitting functional layer 161 and a light emitting layer 162 over the anode unit 142, the light emitting functional layer 161 including a first light emitting functional layer 1611 and/or a second light emitting functional layer 1612, the first light emitting functional layer 1611 being over the anode unit 142 and the banks 15, the second light emitting functional layer 1612 being over the light emitting layer 162 and the banks 15;
a cathode layer 17 covering the organic light emitting structure layer 16 and the cathode tap structure 141;
a package structure 18 covering the cathode layer 17;
among them, the material of the first organic layer F1 includes the material of the first light emitting functional layer 1611 and/or the material of the second light emitting functional layer 1612.
Alternatively, the light emitting layer 162 may be made of different electroluminescent materials to emit light of different colors.
In the display panel provided by the embodiment, the cathode overlapping structure 141 and the anode unit 142 are arranged on the same layer, which is beneficial to reducing the number of film layers and reducing the production cost; the light emitting function layer 161 contributes to improvement of the performance of the organic electroluminescent device; the light-emitting functional layer 161 is covered in the whole display area, so that the light-emitting functional layer is easily mistakenly covered on the cathode overlapping structure 141 due to the accuracy problem, the cathode overlapping structure is obliquely arranged or is arranged to be arched and is matched with the groove 132, so that the material of the light-emitting functional layer 161 mistakenly covered on the cathode overlapping structure 141 can quickly and easily flow into the groove 132 after being dissolved, good overlapping between the cathode overlapping structure 141 and the cathode layer 17 is ensured, and the production yield of products is improved while the accuracy is not improved.
As shown in fig. 3 or fig. 4, the cathode overlapping structure 141 and the regional power negative electrode 121 may be connected by a via, where the via may be formed when the planarization layer 13 is patterned with the overlapping table 131, the groove 132, and the like.
As shown in fig. 3 or 4, the first conductive layer 12 further includes a source electrode 122 and a drain electrode 123 located in the display region a. That is, the local power supply cathode 121 may be disposed on the source-drain metal layer. By arranging the regional power source cathode 121 in the same layer as the source electrode 122 and the drain electrode 123, the film structure can be simplified, and the manufacturing process can be simplified.
As shown in fig. 3 or 4, the groove 132 further accommodates a second organic layer F2 disposed above the first organic layer F1, and the material of the second organic layer F2 includes a curable organic solvent and a desiccant. By adding the second organic layer F2, the first organic layer F1 can be covered, and since the material of the second organic layer F2 includes a desiccant, a certain moisture absorption effect can be achieved, which has a positive effect on protecting the organic light emitting display panel. Further, the thickness of the second organic layer F2 is preferably such that the second organic layer F2 fills the groove 132.
As shown in FIG. 4 or FIG. 5, the width of the groove 132 is 1 μm to 8 μm, and the depth of the groove 132 is 0.3 μm to 5 μm. As shown in fig. 4, when the upper surface of the joining table 131 is an inclined surface, the inclination angle of the inclined surface is 20 ° to 60 °; as shown in FIG. 5, when the upper surface of the bridge 131 is an arch surface, the chord length of the arch surface is 20 μm to 140 μm, and the arch height is 1.5 μm to 5 μm.
As shown in fig. 5, the first light emitting function layer 1611 includes: a hole injection layer 1611a and a hole transport layer 1611b, wherein the hole transport layer 1611b is located on the side of the hole injection layer 1611a away from the anode unit 142. The second light emission function layer 1612 includes: an electron transport layer 1612a and an electron injection layer 1612b, wherein the electron transport layer 1612a is located on the side of the electron injection layer 1612b remote from the cathode layer 17. Both the first light emitting function layer 1611 and the second light emitting function layer 1612 can improve the performance of the organic light emitting device, and whether the light emitting function layer 161 includes both the first light emitting function layer 1611 and the second light emitting function layer 1612 can be selected according to specific requirements.
Based on the same inventive concept, the present embodiment provides a method for manufacturing a display panel, please refer to fig. 6 and fig. 7, and refer to fig. 2 to fig. 5, in which the display panel includes a plurality of display units 1, a circuit connection unit 2 connected between the display units 1, and a hollow structure 3 located between the display units 1 and the circuit connection unit 2; each display unit 1 includes a display area a and a frame area B. The manufacturing method provided by the embodiment comprises the following steps:
s101: a substrate 11 is provided, as shown in fig. 7, the substrate 11 includes a plurality of island regions 1 ' corresponding to the display units 1, a plurality of connection regions 2 ' corresponding to the line connection units 2, and hollow regions 3 ' corresponding to the hollow structures 3.
S102: a first conductive layer 12 is formed on the substrate 11, as shown in fig. 3 or fig. 4, the first conductive layer 12 includes a regional power cathode 121 located in the frame area a.
S103: a planarization layer 13 is formed on the first conductive layer 12, and the planarization layer 13 is patterned, so that a landing pad 131 and a groove 132 are formed on the planarization layer 13 in the frame region B, wherein, as shown in fig. 4, the upper surface of the landing pad 131 is an inclined surface, and the groove 132 is located on a side where the inclined surface of the landing pad 131 is inclined downward. Alternatively, as shown in fig. 5, the upper surface of the landing pad 131 formed by patterning the planarizing layer 13 may be an arcuate surface, and in this case, the recessed grooves 132 are located on both sides of the landing pad 131.
S104: as shown in fig. 3 or 4, the second conductive layer 14 is formed on the planarization layer 13, and the second conductive layer 14 includes a cathode overlapping structure 141 located on the overlapping table 131 and adapted to the shape of the upper surface of the overlapping table 131, and the cathode overlapping structure 141 is connected to the regional power source cathode 121. Specifically, the connection between the cathode lap joint structure 141 and the regional power source cathode 121 may be realized by means of a via hole, wherein the via hole may be formed in the process of performing the patterning process in step S103.
S105: the cathode overlapping structure 141 is washed with an organic washing agent, so that the organic material erroneously covered on the cathode overlapping structure 141 is dissolved by the organic washing agent and flows into the groove 132 along the cathode overlapping structure 141. Specifically, the organic solvent may be ethanol, dichloromethane, acetonitrile, acetone, isopropanol, alkane, tetrahydrofuran, a lipid solvent, an ether solvent, or the like.
S106: the organic rinse is evaporated such that the organic material is solidified within the grooves 132 to form a first organic layer F1 within the grooves 132. In particular, it can be used in high vacuum (pressure less than 10 atmospheres)-5pa) and evaporating the organic rinsing agent under heating conditions, wherein the heating temperature can be adjusted according to the type of the organic rinsing agent, but other film layers cannot be damaged in the heating process, and for example, the organic rinsing agent can be heated at 80 ℃.
In the manufacturing method of the display panel provided by this embodiment, because the cathode overlapping structure 141 is obliquely arranged or designed to be arched and is matched with the groove 132, the organic material mistakenly covered on the surface of the cathode overlapping structure 141 can flow into the groove 132 after being dissolved, so that a good overlapping between the cathode overlapping structure 141 and the cathode layer 17 is ensured, and the production yield of the product is improved while the precision is not improved; moreover, the organic material flowing into the groove 132 can be cured without affecting the performance of the display panel; meanwhile, the cathode overlapping structure 141 is obliquely arranged or designed to be arched, so that the width of the cathode overlapping structure 141 can be reduced while the requirement of the overlapping area is ensured, and therefore, even if the design of the groove 132 is added, the width of the frame area B cannot be increased.
Further, in step S105, an organic flushing agent may be printed or sprayed on the position where the cathode overlapping structure 141 is located, so that the organic flushing agent dissolves the organic material.
Referring to fig. 3 (or fig. 4), the display area a includes an opening area a1 and a pixel defining area a2 located between the opening areas a1, and further, the manufacturing method of the present embodiment further includes:
forming a retaining wall 15, wherein the retaining wall 15 is located on the planarization layer 13 and located in the pixel defining region a 2;
fabricating an organic light emitting structure layer 16, including: manufacturing a light emitting functional layer 161 and a light emitting layer 162 on the anode unit 142; wherein, the manufacturing of the light emitting functional layer 161 includes: fabricating a first light-emitting functional layer 1611 and/or fabricating a second light-emitting functional layer 1612, wherein the first light-emitting functional layer 1611 is located above the anode unit 142 and the retaining wall 15, and the second light-emitting functional layer 1612 is located above the light-emitting layer 161 and the retaining wall 15;
manufacturing a cathode layer 17, wherein the cathode layer 17 covers the organic light-emitting structure layer 16 and the cathode lap joint structure 141;
manufacturing a packaging structure 18, wherein the packaging structure 18 covers the cathode layer 17;
among them, the material of the first organic layer F1 includes the material of the first light emitting functional layer 1611 and/or the material of the second light emitting functional layer 1612.
Specifically, referring to fig. 4 (or fig. 5), fig. 7 and fig. 8, the manufacturing method provided by the present embodiment includes the following steps:
s201: a substrate 11 is provided, as shown in fig. 7, the substrate 11 includes a plurality of island regions 1 ' corresponding to the display units 1, a plurality of connection regions 2 ' corresponding to the line connection units 2, and hollow regions 3 ' corresponding to the hollow structures 3.
S202: as shown in fig. 4 or fig. 5, the first conductive layer 12 is formed on the substrate 11, and the first conductive layer 12 includes a local power cathode 121 located in the frame region B and a source 122 and a drain 123 located in the display region a.
S203: a planarization layer 13 is formed on the first conductive layer 12, and the planarization layer 13 is patterned, so that the planarization layer 13 located in the frame region B forms a landing pad 131 and a groove 132, and the planarization layer 13 located in the display region a forms an opening region a1, wherein, as shown in fig. 3, the upper surface of the landing pad 131 is an inclined surface, and the groove 132 is located on a side where the inclined surface of the landing pad 131 is inclined downward. Alternatively, as shown in fig. 4, the upper surface of the bridge 131 is an arched surface, and the grooves 132 are located on both sides of the bridge 131;
s204: a second conductive layer 14 is formed on the planarization layer 13, as shown in fig. 3 or fig. 4, the second conductive layer 14 includes a cathode lap joint structure 141 located on the lap joint table 131 and adapted to the shape of the upper surface of the lap joint table 131, and an anode unit 142 located in the opening area a2, wherein the cathode lap joint structure 141 is connected to the regional power source cathode 121.
S205: the retaining wall 15 is formed, as shown in fig. 3 or fig. 4, the retaining wall 15 is located on the planarization layer 14 and located in the pixel defining region a 2.
S206: an organic light emitting structure layer 16 is fabricated. Specifically, the steps include: a light-emitting functional layer 161 is formed and a light-emitting layer 162 is formed on the anode unit 142. The manufacturing of the light emitting function layer 161 includes: a first light-emitting function layer 1611 is formed and/or a second light-emitting function layer 1612 is formed, wherein the first light-emitting function layer 1611 is located above the anode unit 142 and the banks 15, and the second light-emitting function layer 1612 is located above the light-emitting layer 161 and the banks 15.
S207: the cathode overlapping structure 141 is washed with an organic washing agent, so that the organic material erroneously covered on the cathode overlapping structure 141 is dissolved by the organic washing agent and flows into the groove 132 along the cathode overlapping structure 141.
S208: the organic rinse is evaporated so that the organic material is solidified within the groove 132 to form the first organic layer F1 within the groove 132, the material of the first organic layer F1 including the material of the first light emitting functional layer 1611 and/or the material of the second light emitting functional layer 1612.
S209: a cathode layer 17 is formed, and the cathode layer 17 covers the organic light emitting structure layer 16 and the cathode lap joint structure 142.
S210: a package structure 18 is fabricated, the package structure 18 covering the cathode layer 17.
In the manufacturing method provided by the embodiment, the cathode lap joint structure 141 and the anode unit 142 are arranged on the same layer, which is beneficial to reducing the number of film layers and reducing the production cost; the light emitting function layer 161 contributes to improvement of the performance of the organic electroluminescent device; the light-emitting functional layer 161 is covered in the whole display area, so that the light-emitting functional layer is easily mistakenly covered on the cathode overlapping structure 141 due to the accuracy problem, therefore, the cathode overlapping structure 141 is obliquely arranged or arranged to be arched and is matched with the groove 132, so that the material of the light-emitting functional layer 161 mistakenly covered on the cathode overlapping structure 141 can quickly and easily flow into the groove 132 after being dissolved, thereby ensuring that the cathode overlapping structure 141 can be well overlapped with the cathode layer 17, and improving the production yield of products while not improving the accuracy.
Further, with continuing to refer to fig. 3 to fig. 5, in the manufacturing method provided in this embodiment, the step of manufacturing the first light emitting functional layer 1611 includes: making a hole injection layer 1611a, wherein the hole injection layer 1611a covers the retaining wall 15 and the anode unit 142; a hole transporting layer 1611b is formed, and the hole transporting layer 1611b covers the hole injecting layer 1611 a. The step of fabricating the second light emitting function layer 1612 includes: fabricating an electron transport layer 1612a, wherein the electron transport layer 1612a is located above the light-emitting layer 162 and the retaining wall 15; an electron injection layer 1612b is formed, and the electron injection layer 1612b covers the electron transport layer 1612 a.
Specifically, referring to fig. 9 in combination with fig. 3 to 5, when the manufacturing of the light emitting function layer 161 includes manufacturing the first light emitting function layer 1611 and manufacturing the second light emitting function layer 1612, the flow of step S206 is as follows:
s2061: a hole injection layer 1611a is formed, and the hole injection layer 1611a covers the banks 15 and the anode unit 142.
S2062: a hole transporting layer 1611b is formed, and the hole transporting layer 1611b covers the hole injecting layer 1611 a.
S2063: a light emitting layer 162 is formed, and the light emitting layer 162 is located above the anode unit 142. Specifically, in the present embodiment, since the light emission function layer 161 includes the first light emission function layer 1611, the light emission layer 162 covers the first light emission function layer 1611 located above the anode unit 142.
S2064: an electron transport layer 1612a is formed, and the electron transport layer 1612a is located above the light-emitting layer 162 and the retaining wall 15. Specifically, in the present embodiment, since the light emission function layer 161 includes the first light emission function layer 1611, the electron transport layer 1612a covers the light emission layer 162 and the first light emission function layer 1611 located above the bank 15.
S2065: an electron injection layer 1612b is formed, and the electron injection layer 1612b covers the electron transport layer 1612 a.
Referring to fig. 3 or fig. 4, the method provided in this embodiment further includes: an organic solvent doped with a desiccant is printed or sprayed in the groove 132 and subjected to a curing process to form a second organic layer F2 on the first organic layer F1.
In the manufacturing method provided by this embodiment, the second organic layer F2 is added, so that the first organic layer F1 can be covered, and the material of the second organic layer F2 includes a desiccant, so that a certain moisture absorption effect can be achieved, which has a positive effect on protecting the organic light emitting display panel. Further, the thickness of the second organic layer F2 is preferably such that the second organic layer F2 fills the groove 132.
By applying the embodiment of the application, at least the following beneficial effects can be realized:
according to the display panel and the manufacturing method thereof provided by the embodiment of the application, the cathode lap joint structure is obliquely arranged or designed to be arched and matched with the groove, so that organic materials which are mistakenly covered on the surface of the cathode lap joint structure can flow into the groove after being dissolved, good lap joint between the cathode lap joint structure and the cathode layer is ensured, and the production yield of products is improved while the precision is not improved; the organic material flowing into the groove can be cured without affecting the performance of the display panel; meanwhile, the cathode lapping structure is obliquely arranged or designed to be arched, so that the width of the cathode lapping structure can be reduced while the requirement of the lapping area is ensured, and the width of the frame area can not be increased even if the design of the groove is increased.
Those of skill in the art will appreciate that the various operations, methods, steps in the processes, acts, or solutions discussed in this application can be interchanged, modified, combined, or eliminated. Further, other steps, measures, or schemes in various operations, methods, or flows that have been discussed in this application can be alternated, altered, rearranged, broken down, combined, or deleted. Further, steps, measures, schemes in the prior art having various operations, methods, procedures disclosed in the present application may also be alternated, modified, rearranged, decomposed, combined, or deleted.
In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
It should be understood that, although the steps in the flowcharts of the figures are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and may be performed in other orders unless explicitly stated herein. Moreover, at least a portion of the steps in the flow chart of the figure may include multiple sub-steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed alternately or alternately with other steps or at least a portion of the sub-steps or stages of other steps.
The foregoing is only a partial embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and decorations can be made without departing from the principle of the present application, and these modifications and decorations should also be regarded as the protection scope of the present application.

Claims (10)

1. The utility model provides a display panel can stretch, includes a plurality of display element, connects circuit linkage element between the display element and is located the display element with hollow out construction between the circuit linkage element, the display element includes display area and frame district, its characterized in that, the display element includes:
a substrate;
the first conducting layer is positioned on the substrate and comprises a regional power supply cathode positioned in the frame area;
the planarization layer covers the first conducting layer and comprises a lapping table and a groove which are positioned in the frame area, wherein the upper surface of the lapping table is an inclined plane, the groove is positioned on one side of the inclined plane of the lapping table, which is inclined downwards, or the upper surface of the lapping table is an arched surface, and the groove is positioned on two sides of the lapping table;
the second conducting layer is positioned on the planarization layer and comprises a cathode lap joint structure which is positioned on the lap joint table and is matched with the shape of the upper surface of the lap joint table, and the cathode lap joint structure is connected with the regional power supply cathode;
the groove is internally provided with a first organic layer, and the first organic layer is formed by dissolving organic materials which are covered on the cathode lap joint structure by mistake, flowing into the groove along the cathode lap joint structure and solidifying.
2. The display panel according to claim 1, wherein the display region includes opening regions and pixel defining regions between the opening regions, the second conductive layer further includes a plurality of anode units located at the opening regions, the display panel further comprising:
the retaining wall is positioned on the planarization layer and positioned in the pixel defining area;
the organic light-emitting structure layer comprises a light-emitting functional layer and a light-emitting layer positioned above the anode unit, the light-emitting functional layer comprises a first light-emitting functional layer and/or a second light-emitting functional layer, the first light-emitting functional layer is positioned above the anode unit and the retaining wall, and the second light-emitting functional layer is positioned above the light-emitting layer and the retaining wall;
a cathode layer covering the organic light emitting structure layer and the cathode lap joint structure;
a packaging structure covering the cathode layer;
wherein the material of the first organic layer comprises a material of the first light emitting functional layer and/or a material of the second light emitting functional layer.
3. The display panel according to claim 2,
the first light emitting functional layer includes: the anode unit comprises a hole injection layer and a hole transport layer, wherein the hole transport layer is positioned on one side, away from the anode unit, of the hole injection layer;
the second light emitting functional layer includes: the electron injection layer is arranged on the cathode layer, and the electron transport layer is arranged on one side of the electron injection layer, which is far away from the cathode layer.
4. The display panel according to claim 1, wherein the first conductive layer further comprises a source electrode and a drain electrode.
5. The display panel of claim 1 wherein the recess further houses a second organic layer over the first organic layer, the second organic layer comprising a curable organic solvent and a desiccant.
6. The display panel according to claim 1, wherein the width of the groove is 1 μm to 8 μm, and the depth of the groove is 0.3 μm to 5 μm;
the inclination angle of the inclined plane is 20-60 degrees;
the arch has a chord length of 20-140 μm and an arch height of 1.5-5 μm.
7. A manufacturing method of a stretchable display panel, wherein the display panel comprises a plurality of display units, line connecting units connected among the display units and a hollow structure positioned between the display units and the line connecting units, the display units comprise display areas and frame areas, and the manufacturing method comprises the following steps:
providing a substrate, wherein the substrate comprises a plurality of island regions corresponding to the display units, a plurality of wiring regions corresponding to the circuit connection units and a plurality of hollowed-out regions corresponding to the hollowed-out structures;
manufacturing a first conducting layer on the substrate, wherein the first conducting layer comprises a regional power supply cathode located in the frame area;
manufacturing a planarization layer on the first conductive layer, and performing patterning processing on the planarization layer to enable the planarization layer located in the frame area to form a lapping table and a groove, wherein the upper surface of the lapping table is an inclined surface, the groove is located on one side of the lapping table, which is inclined downwards, or the upper surface of the lapping table is an arched surface, and the groove is located on two sides of the lapping table;
manufacturing a second conducting layer on the planarization layer, wherein the second conducting layer comprises a cathode lap joint structure which is positioned on the lap joint table and is matched with the upper surface shape of the lap joint table, and the cathode lap joint structure is connected with the regional power supply cathode;
washing the cathode lapping structure by using an organic washing agent so that organic materials which are mistakenly covered on the cathode lapping structure are dissolved by the organic washing agent and flow into the groove along the cathode lapping structure;
evaporating the organic rinse such that the organic material is solidified within the grooves to form a first organic layer within the grooves.
8. The method of claim 7, wherein the display area comprises open areas and pixel defining areas between the open areas, the second conductive layer further comprises a plurality of anode elements disposed in the open areas, and the method further comprises:
manufacturing a retaining wall, wherein the retaining wall is positioned on the planarization layer and positioned in the pixel defining area;
manufacturing an organic light emitting structure layer, comprising: manufacturing a light-emitting functional layer and a light-emitting layer on the anode unit, wherein the manufacturing of the light-emitting functional layer comprises the following steps: manufacturing a first light-emitting functional layer and/or manufacturing a second light-emitting functional layer, wherein the first light-emitting functional layer is positioned above the anode unit and the retaining wall, and the second light-emitting functional layer is positioned above the light-emitting layer and the retaining wall;
manufacturing a cathode layer, wherein the cathode layer covers the organic light-emitting structure layer and the cathode lap joint structure;
manufacturing a packaging structure, wherein the packaging structure covers the cathode layer;
wherein the material of the first organic layer comprises the material of the first light emitting functional layer and/or the material of the second light emitting functional layer.
9. The method of manufacturing according to claim 8,
the manufacturing of the first light-emitting functional layer includes:
manufacturing a hole injection layer, wherein the hole injection layer covers the retaining wall and the anode unit;
manufacturing a hole transport layer, wherein the hole transport layer covers the hole injection layer;
the manufacturing of the second light-emitting functional layer includes:
manufacturing an electron transport layer, wherein the electron transport layer is positioned above the light-emitting layer and the retaining wall;
and manufacturing an electron injection layer, wherein the electron injection layer covers the electron transmission layer.
10. The method of manufacturing according to claim 8, further comprising:
and printing or spraying an organic solvent doped with a drying agent into the groove and carrying out curing treatment to form a second organic layer on the first organic layer.
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