CN110634927A - Display panel, preparation method thereof and display device - Google Patents
Display panel, preparation method thereof and display device Download PDFInfo
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- CN110634927A CN110634927A CN201910917577.1A CN201910917577A CN110634927A CN 110634927 A CN110634927 A CN 110634927A CN 201910917577 A CN201910917577 A CN 201910917577A CN 110634927 A CN110634927 A CN 110634927A
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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
- H10K50/80—Constructional details
- H10K50/84—Passivation; Containers; Encapsulations
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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
- H10K59/122—Pixel-defining structures or layers, e.g. banks
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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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Abstract
The application discloses a display panel, a preparation method thereof and a display device, which are used for distinguishing the boundary of an organic packaging layer. According to the display panel provided by the embodiment of the application, the display panel is divided into a display area and a peripheral area surrounding the display area; the display area and the peripheral area include: a planarization layer, and a pixel defining layer over the planarization layer; in the peripheral area and in an area uncovered by the pixel definition layer, the planarization layer comprises a plurality of mutually spaced boundary calibration structures, and the boundary calibration structures surround the display area; an organic encapsulation layer covering at least the display region is also included over the planarization layer.
Description
Technical Field
The application 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
The production of an Active-matrix organic light-emitting diode (AMOLED) display product involves many processes, and the package is a key part of the AMOLED display product. Since the light emitting device is highly sensitive to water and oxygen, the light emitting device is damaged once it is invaded by water and oxygen, resulting in that the display product cannot normally operate. In the prior art, the encapsulation is generally carried out by utilizing a structure of an inorganic layer/organic layer/inorganic layer three-layer encapsulation film. Wherein, the organic layer of intermediate level is directly accomplished through the mode of inkjet printing with printing equipment, because outside water oxygen invades along organic layer passageway easily, organic layer Ink (Ink) printing area is no longer than the barricade that sets up in the frame district, if Ink material overflows (overflow), the condition that appears Ink and crosses the barricade can produce serious influence to showing product dependability. Therefore, the edge position of the organic layer needs to be monitored, and the display product in the prior art cannot monitor the boundary of the organic layer by using an optical microscope because the material of the organic layer is a material with high transparency, and can only determine the position of the boundary of the organic layer under an electron microscope by cutting a sample.
In conclusion, the monitoring of the organic layer boundary in the prior art is time-consuming, and the process progress is seriously influenced.
Disclosure of Invention
The embodiment of the application provides a display panel, a preparation method thereof and a display device, which are used for distinguishing the boundary of an organic packaging layer.
According to the display panel provided by the embodiment of the application, the display panel is divided into a display area and a peripheral area surrounding the display area;
the display area and the peripheral area include: a planarization layer, and a pixel defining layer over the planarization layer;
in the peripheral area and in an area uncovered by the pixel definition layer, the planarization layer comprises a plurality of mutually spaced boundary calibration structures, and the boundary calibration structures surround the display area;
an organic encapsulation layer covering at least the display region is also included over the planarization layer.
The display panel that this application embodiment provided, including the boundary calibration structure of mutual interval in the planarization layer, under optical microscope, the color of the boundary calibration structure that is not covered by organic encapsulation layer is different with the color of the boundary calibration structure that is covered by organic encapsulation layer, thereby can utilize the boundary calibration structure to monitor organic luminescent layer boundary under optical microscope, save the inkjet printing technology required time, thereby in time, the dwell area of organic luminescent layer material is distinguished to the efficient, avoid organic luminescent layer material to spill over.
Optionally, the organic encapsulation layer covers the boundary demarcating structure.
Optionally, the organic encapsulation layer covers a part of the boundary demarcating structure.
The organic packaging layer covers the display area and part of the peripheral area, only part of the boundary calibration structure is covered by the organic packaging layer in the peripheral area, and the boundary calibration structure in the peripheral area has an area which is not covered by the organic packaging layer. In this way, the boundary of the organic encapsulation layer can be detected by using an optical microscope during the preparation process of the display panel. When the organic packaging layer covers part of the boundary calibration structure, under an optical microscope, the color of the boundary calibration structure covered by the organic packaging layer is different from the color of the boundary calibration structure not covered by the organic packaging layer, so that the organic packaging layer can be determined not to exceed the retaining wall in the peripheral region, the overflow of the material of the organic packaging layer can be avoided, the monitoring of the boundary of the organic light emitting layer can be realized, and the region where the organic light emitting material stays can be distinguished.
Optionally, the peripheral region further includes a cathode contact layer located on the planarization layer and filling gaps between the boundary demarcating structures.
Optionally, the peripheral zone further includes: a driving lead layer and a cathode lead layer in contact with the cathode contact layer, respectively;
the driving lead layer is positioned on one side of the boundary calibration structure, which is far away from the display area, and is positioned below the cathode contact layer;
the cathode lead layer is positioned on the cathode contact layer and covers the boundary calibration structure.
Optionally, under an optical microscope, the color of the boundary calibration structure covered by the organic encapsulation layer is white, and the color of the boundary calibration structure not covered by the organic encapsulation layer is black.
Therefore, when the organic packaging layer covers the boundary of the boundary calibration structure, the organic packaging layer can be identified under an optical microscope, and in the ink-jet printing process, the optical microscope is used for monitoring the boundary of the material of the organic packaging layer, so that the organic packaging layer covers the part of the boundary calibration structure, the material of the organic packaging layer can be prevented from crossing the retaining wall, and the water oxygen is prevented from invading along the organic packaging layer.
Optionally, in a direction pointing to the peripheral area along the display area, the width of the boundary calibration structures is 5 to 10 micrometers, and the width of gaps between the boundary calibration structures is 5 to 10 micrometers.
The embodiment of the application provides a preparation method of a display panel, which comprises the following steps:
providing a substrate provided with a planarization layer; wherein the display panel is divided into a display area and a peripheral area surrounding the display area;
carrying out a patterning process on the planarization layer in the peripheral area, and forming a plurality of boundary calibration structures which are spaced from each other in the peripheral area;
forming a pixel defining layer over the planarization layer;
forming an organic encapsulation layer covering at least the display region over the pixel defining layer, and determining a boundary of the organic encapsulation layer using an optical microscope.
According to the preparation method of the display panel, the boundary calibration structures which are mutually spaced are formed in the planarization layer, so that in the subsequent process of setting the organic packaging layer, under an optical microscope, the color of the boundary calibration structure which is not covered by the organic packaging layer is different from the color of the boundary calibration structure which is covered by the organic packaging layer, the boundary of the organic light emitting layer can be monitored under the optical microscope by using the boundary calibration structure, the time required by an ink-jet printing process is saved, the staying area of the material of the organic light emitting layer is timely and efficiently distinguished, and the overflow of the material of the organic light emitting layer is avoided.
Optionally, determining the boundary of the organic encapsulation layer by using an optical microscope specifically includes:
determining the color of the boundary calibration structure by using the optical microscope;
and when the color of the boundary of part of the boundary calibration structure is white and the color of the boundary of the rest part of the boundary calibration structure is black, determining that the organic packaging layer covers part of the boundary calibration structure.
The display device provided by the embodiment of the application comprises the display panel provided by the embodiment of the application.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, 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 view of a display panel according to an embodiment of the present disclosure;
FIG. 2 is a schematic cross-sectional view along AA' of FIG. 1 according to an embodiment of the present disclosure;
fig. 3 is a schematic flowchart of a method for manufacturing a display panel according to an embodiment of the present disclosure;
fig. 4 is a schematic view of a planarization layer in a method for manufacturing a display panel according to an embodiment of the present disclosure.
Detailed Description
The embodiment of the application provides a display panel, as shown in fig. 1, the display panel is divided into a display area 1 and a peripheral area 2 surrounding the display area 1;
a cross section along AA' in fig. 1 is shown in fig. 2, and the display region 1 and the peripheral region 2 include: a planarization layer 3, and a pixel defining layer 4 located above the planarization layer 3;
in the peripheral region 2 and in the region not covered by the pixel definition layer 4, the planarization layer 3 includes a plurality of boundary calibration structures 5 spaced apart from each other, and the boundary calibration structures 5 surround the display region 1;
an organic encapsulation layer 6 covering at least the display region 1 is also included over the planarization layer 3.
The display panel that this application embodiment provided, including the boundary calibration structure of mutual interval in the planarization layer, under optical microscope, the color of the boundary calibration structure that is not covered by organic encapsulation layer is different with the color of the boundary calibration structure that is covered by organic encapsulation layer, thereby can utilize the boundary calibration structure to monitor organic luminescent layer boundary under optical microscope, save the inkjet printing technology required time, thereby in time, the dwell area of organic luminescent layer material is distinguished to the efficient, avoid organic luminescent layer material to spill over.
Optionally, as shown in fig. 2, the organic encapsulation layer 6 covers the boundary demarcating structure 5.
Optionally, as shown in fig. 2, the organic encapsulation layer 6 covers a part of the boundary demarcating structure 5.
The organic packaging layer covers the display area and part of the peripheral area, only part of the boundary calibration structure is covered by the organic packaging layer in the peripheral area, and the boundary calibration structure in the peripheral area has an area which is not covered by the organic packaging layer. In this way, the boundary of the organic encapsulation layer can be detected by using an optical microscope during the preparation process of the display panel. When the organic packaging layer covers part of the boundary calibration structure, under an optical microscope, the color of the boundary calibration structure covered by the organic packaging layer is different from the color of the boundary calibration structure not covered by the organic packaging layer, so that the organic packaging layer can be determined not to exceed the retaining wall in the peripheral region, the overflow of the material of the organic packaging layer can be avoided, the monitoring of the boundary of the organic light emitting layer can be realized, and the region where the organic light emitting material stays can be distinguished.
In specific implementation, the number of the boundary calibration structures can be selected according to actual needs.
Optionally, the material of the planarization layer comprises Polyimide (PI).
Optionally, as shown in fig. 2, the peripheral region 2 further includes a cathode contact layer 7 located on the planarization layer 3 and filling the gap between the boundary demarcating structures 5.
Optionally, as shown in fig. 2, the peripheral area 2 further includes: a driving lead layer 8 and a cathode lead layer 9 respectively in contact with the cathode contact layer 7;
the driving lead layer 8 is positioned on the side of the boundary calibration structure 5 away from the display area 1 and below the cathode contact layer 7;
the cathode lead layer 9 is located on the cathode contact layer 7 and covers the boundary calibration structure 5.
As shown in fig. 2, the display panel provided in the embodiment of the present application further includes: a substrate 18, an anode 10 at the same level as the cathode contact layer, a cathode 11 at the same level as the cathode lead layer 9, a light emitting functional layer 12 between the anode 10 and the cathode 11, a spacer layer 13 above the pixel defining layer 4, a first inorganic encapsulating layer 14 between the cathode 11 and the organic encapsulating layer 6, and a second inorganic encapsulating layer 15 above the organic encapsulating layer 6. In the peripheral region 2, the pixel defining layer 4 and the spacer layer 13 form a first barrier wall 16, and on a side of the first barrier wall 16 away from the display region 1, the planarization layer 3, the pixel defining layer 4 and the spacer layer 13 form a second barrier wall 17.
The substrate may include, for example: a first PI, a second PI, a first barrier layer (barrier) between the two PI layers, a second barrier layer (barrier) over the second PI layer, a buffer layer (buffer) over the barrier layer, each layer of the thin film transistor over the buffer layer. Taking a thin film transistor as an example of a thin film transistor with a top gate structure, each film layer of the thin film transistor comprises: a gate electrode, a gate insulating layer, an active layer, an interlayer insulating layer, a source electrode and a drain electrode.
The driving wiring layer may be provided in the same layer as the source and drain electrodes of the thin film transistor, for example.
The light-emitting functional layer may include, for example, an organic light-emitting layer. The display area includes a plurality of sub-pixels emitting light of different colors, and the sub-pixels may include, for example: the red sub-pixel, the blue sub-pixel and the green sub-pixel, correspondingly, the material of the organic light emitting layer includes: red light organic light emitting materials, blue light organic light emitting materials, and organic light emitting materials.
Optionally, under an optical microscope, the color of the boundary calibration structure covered by the organic encapsulation layer is white, and the color of the boundary calibration structure not covered by the organic encapsulation layer is black.
It should be noted that when the organic encapsulation layer covers the boundary of the boundary calibration structure, the reflection of the boundary light covered by the organic encapsulation layer is stronger at the boundary than at the uncovered boundary, so that under the optical microscope, the covered boundary is whitish, and the uncovered boundary is still black under the optical microscope.
Therefore, when the organic packaging layer covers the boundary of the boundary calibration structure, the organic packaging layer can be identified under an optical microscope, and in the ink-jet printing process, the optical microscope is used for monitoring the boundary of the material of the organic packaging layer, so that the organic packaging layer covers the part of the boundary calibration structure, the material of the organic packaging layer can be prevented from crossing the retaining wall, and the water oxygen is prevented from invading along the organic packaging layer.
Optionally, in a direction pointing to the peripheral area along the display area, the width of the boundary calibration structures is 5 to 10 micrometers, and the width of gaps between the boundary calibration structures is 5 to 10 micrometers.
As shown in fig. 3, the method for manufacturing a display panel provided in the embodiment of the present application includes:
s101, providing a substrate provided with a planarization layer; wherein the display panel is divided into a display area and a peripheral area surrounding the display area;
s102, carrying out a patterning process on the planarization layer in the peripheral area, and forming a plurality of boundary calibration structures which are spaced from each other in the peripheral area;
s103, forming a pixel definition layer on the planarization layer;
and S104, forming an organic packaging layer at least covering the display area on the pixel definition layer, and determining the boundary of the organic packaging layer by using an optical microscope.
According to the preparation method of the display panel, the boundary calibration structures which are mutually spaced are formed in the planarization layer, so that in the subsequent process of setting the organic packaging layer, under an optical microscope, the color of the boundary calibration structure which is not covered by the organic packaging layer is different from the color of the boundary calibration structure which is covered by the organic packaging layer, the boundary of the organic light emitting layer can be monitored under the optical microscope by using the boundary calibration structure, the time required by an ink-jet printing process is saved, the staying area of the material of the organic light emitting layer is timely and efficiently distinguished, and the overflow of the material of the organic light emitting layer is avoided.
Optionally, step S101 provides a substrate provided with a planarization layer, and specifically includes:
sequentially forming a first PI, a first barrier, a second PI, a second barrier, a buffer, an active layer, a gate insulating layer, a grid, an interlayer insulating layer, a source electrode and a drain electrode; wherein, a driving lead layer is formed in the peripheral region at the same time of forming the source and drain electrodes.
Optionally, in step S102, a patterning process is performed on the planarization layer in the peripheral area, and a plurality of boundary calibration structures spaced apart from each other are formed in the peripheral area, which specifically includes:
and exposing and developing the planarization layer, and then etching to form a plurality of mutually-spaced patterns of the boundary calibration structure.
After etching the planarization layer, the pattern of the planarization layer is shown in fig. 4, the boundary demarcating structures 5 surrounding the display area 1 with gaps 20 between the boundary demarcating structures 5. It should be noted that, in addition to the pattern of the boundary demarcating structure, as shown in fig. 4, in the peripheral area, the pattern 19 as the second barrier wall portion needs to be formed by patterning the planarization layer.
Optionally, in step S102, a patterning process is performed on the planarization layer in the peripheral area, and then the method further includes:
forming an anode and cathode contact layer over the planarization layer; the cathode contact layer covers the gaps between the boundary demarcating structures.
Optionally, after forming the pixel defining layer over the planarization layer in step S103, the method further includes:
a spacer layer, a light emitting functional layer, a cathode lead layer, and a first inorganic encapsulation layer are formed.
Optionally, step S104 is to form an organic encapsulation layer at least covering the display area on the pixel definition layer, and specifically includes:
and forming the organic packaging layer by adopting an ink-jet printing process.
Optionally, in step S104, determining the boundary of the organic encapsulation layer by using an optical microscope, specifically including:
determining the color of the boundary calibration structure by using the optical microscope;
and when the color of the boundary of part of the boundary calibration structure is white and the color of the boundary of the rest part of the boundary calibration structure is black, determining that the organic packaging layer covers part of the boundary calibration structure.
Optionally, after determining the material covering part boundary calibration structure of the organic encapsulation layer by using an optical microscope, the method further includes:
a second inorganic encapsulation layer is formed over the organic encapsulation layer.
The display device provided by the embodiment of the application comprises the display panel provided by the embodiment of the application.
The display device provided by the embodiment of the application can be a mobile phone, a tablet computer, a television and the like.
In summary, according to the display panel, the manufacturing method thereof and the display device provided in the embodiment of the application, the planarization layer includes the boundary calibration structures spaced from each other, and under the optical microscope, the color of the boundary calibration structure not covered by the organic encapsulation layer is different from the color of the boundary calibration structure covered by the organic encapsulation layer, so that the boundary of the organic light emitting layer can be monitored under the optical microscope by using the boundary calibration structure, the time required by the inkjet printing process is saved, the staying area of the material of the organic light emitting layer is timely and efficiently distinguished, and the overflow of the material of the organic light emitting layer is avoided.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (10)
1. The display panel is characterized in that the display panel is divided into a display area and a peripheral area surrounding the display area;
the display area and the peripheral area include: a planarization layer, and a pixel defining layer over the planarization layer;
in the peripheral area and in an area uncovered by the pixel definition layer, the planarization layer comprises a plurality of mutually spaced boundary calibration structures, and the boundary calibration structures surround the display area;
an organic encapsulation layer covering at least the display region is also included over the planarization layer.
2. The display panel of claim 1, wherein the organic encapsulation layer covers the border calibration structure.
3. The display panel of claim 1, wherein the organic encapsulation layer covers a portion of the border calibration structure.
4. The display panel of claim 1, wherein the peripheral region further comprises a cathode contact layer over the planarization layer and filling gaps between the boundary demarcating structures.
5. The display panel according to claim 4, wherein the peripheral region further comprises: a driving lead layer and a cathode lead layer in contact with the cathode contact layer, respectively;
the driving lead layer is positioned on one side of the boundary calibration structure, which is far away from the display area, and is positioned below the cathode contact layer;
the cathode lead layer is positioned on the cathode contact layer and covers the boundary calibration structure.
6. The display panel according to claim 1, wherein under an optical microscope, the color of the boundary calibration structure covered by the organic encapsulation layer is white, and the color of the boundary calibration structure uncovered by the organic encapsulation layer is black.
7. The display panel according to claim 1, wherein the width of the boundary alignment structures is 5 to 10 micrometers and the width of the gaps between the boundary alignment structures is 5 to 10 micrometers in a direction along the display area toward the peripheral area.
8. A method for manufacturing a display panel, the method comprising:
providing a substrate provided with a planarization layer; wherein the display panel is divided into a display area and a peripheral area surrounding the display area;
carrying out a patterning process on the planarization layer in the peripheral area, and forming a plurality of boundary calibration structures which are spaced from each other in the peripheral area;
forming a pixel defining layer over the planarization layer;
forming an organic encapsulation layer covering at least the display region over the pixel defining layer, and determining a boundary of the organic encapsulation layer using an optical microscope.
9. The method according to claim 8, wherein determining the boundary of the organic encapsulation layer using an optical microscope comprises:
determining the color of the boundary calibration structure by using the optical microscope;
and when the color of the boundary of part of the boundary calibration structure is white and the color of the boundary of the rest part of the boundary calibration structure is black, determining that the organic packaging layer covers part of the boundary calibration structure.
10. A display device comprising the display panel according to any one of claims 1 to 7.
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| CN201910917577.1A CN110634927B (en) | 2019-09-26 | 2019-09-26 | Display panel, preparation method thereof and display device |
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| CN111490083A (en) * | 2020-04-20 | 2020-08-04 | 京东方科技集团股份有限公司 | Display panel, preparation method thereof, edge crack detection method and display device |
| CN111710702A (en) * | 2020-06-29 | 2020-09-25 | 京东方科技集团股份有限公司 | Display panel, manufacturing method thereof and display device |
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| CN109616585A (en) * | 2019-01-04 | 2019-04-12 | 京东方科技集团股份有限公司 | A kind of organic electro-luminescence display device and preparation method thereof |
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| CN108598282A (en) * | 2018-05-11 | 2018-09-28 | 京东方科技集团股份有限公司 | A kind of display base plate and its detection method, detection device |
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| CN111710702A (en) * | 2020-06-29 | 2020-09-25 | 京东方科技集团股份有限公司 | Display panel, manufacturing method thereof and display device |
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