CN108962939B - Pixel unit, display panel and preparation method thereof - Google Patents
Pixel unit, display panel and preparation method thereof Download PDFInfo
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- CN108962939B CN108962939B CN201711450016.2A CN201711450016A CN108962939B CN 108962939 B CN108962939 B CN 108962939B CN 201711450016 A CN201711450016 A CN 201711450016A CN 108962939 B CN108962939 B CN 108962939B
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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
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
- H10K59/353—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels characterised by the geometrical arrangement of the RGB subpixels
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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 invention relates to a pixel unit, a display panel and a preparation method thereof, wherein the pixel unit comprises: a substrate; the pixel defining layer is arranged on the substrate in a stacked mode and comprises a first pixel bank and a second pixel bank, the first pixel bank is provided with a first opening, the second pixel bank is located in the first opening and divides the first opening into two second openings, and the thickness of the first pixel bank is larger than that of the second pixel bank; the two pixel electrodes respectively correspond to the two second openings; a light emitting functional layer and a top electrode. The pixel unit comprises 2 adjacent sub-pixels with the same color, 2 pixel electrodes are close to each other, and the ink deposition areas of the two adjacent sub-pixels are combined by arranging the pixel banks with different thicknesses, so that the capacity of the ink deposition areas is increased, and the resolution of the printable substrate is improved.
Description
Technical Field
The invention relates to the technical field of electroluminescent devices, in particular to a pixel unit, a display panel and a preparation method of the pixel unit and the display panel.
Background
The solution processing is adopted to manufacture OLED and QLED displays, and the solution processing is an important direction for the development of future display technology due to the advantages of low cost, high productivity, easy realization of large size and the like. Among them, printing technology is considered to be the most effective way to achieve low cost and large area full color display of OLEDs as well as QLEDs.
In the printing process, due to the influence of the precision of the equipment and the size of liquid drops, for the pixel structure of the traditional RGB Stripe arrangement, when the resolution of the display device reaches 200ppi, the width of each sub-pixel is reduced to 42 μm, meanwhile, due to the existence of the pixel defining layer, the real width of the sub-pixel is further reduced to about 35 μm, and for 10pL volume ink, the diameter is 27 μm. If the resolution is further increased, the size of the sub-pixels is further reduced, and it is difficult to control the ink in each sub-pixel to be independent from each other without overflowing the pixel pits, so that it is relatively difficult to realize the printing preparation of the high-resolution display device.
Therefore, the prior art is subject to further improvement and development.
Disclosure of Invention
Based on this, the invention aims to provide a pixel unit structure.
The specific technical scheme is as follows:
a pixel cell, comprising:
a substrate;
the pixel defining layer is arranged on the substrate in a stacked mode and comprises a first pixel bank and a second pixel bank, the first pixel bank is provided with a first opening, the second pixel bank is located in the first opening and divides the first opening into two second openings, and the thickness of the first pixel bank is larger than that of the second pixel bank;
two pixel electrodes stacked on the substrate, the two pixel electrodes corresponding to the two second openings, respectively;
a light-emitting functional layer laminated on the pixel electrode and covering the first opening;
and a top electrode laminated on the light emitting function layer and covering the pixel defining layer.
In some of these embodiments, the pixel cell further comprises a planarization layer between the substrate and the pixel defining layer.
In some embodiments, the pixel unit further includes a driving circuit embedded in the planarization layer and disposed in a staggered manner with respect to the first opening.
In some of these embodiments, the light emitting functional layer includes one or more of a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, and an electron injection layer.
The invention also provides a display panel which comprises a plurality of pixel units.
In some embodiments, the pixel units are rectangular, and the arrangement of the pixel units is as follows: two adjacent pixel units are aligned along the short side of the rectangle, and the first openings of the two adjacent pixel units are staggered along the long side of the rectangle.
Another object of the present invention is to provide a method for manufacturing the display panel, including the following steps:
providing a substrate with a driving circuit;
manufacturing a patterned pixel electrode on the substrate;
manufacturing a pixel defining layer on the substrate, wherein the pixel defining layer comprises a first pixel bank and a second pixel bank, the first pixel bank is provided with a first opening, the second pixel bank is positioned in the first opening and divides the first opening into 2 second openings, and the thickness of the first pixel bank is greater than that of the second pixel bank; the pixel electrode corresponds to the second opening;
depositing and manufacturing a light-emitting functional layer on the first opening;
and depositing and manufacturing a top electrode on the light-emitting functional layer, and covering the pixel defining layer.
In some embodiments, the first openings are rectangular in shape, and adjacent first openings are staggered along the long side of the rectangle.
In some of these embodiments, the method of preparation further comprises the steps of:
and manufacturing a flat layer on the substrate, wherein the driving circuit is embedded in the flat layer.
The invention also provides a display device comprising the display panel.
In some of these embodiments, the display device is an OLED or a QLED.
The pixel unit comprises 2 adjacent same-color sub-pixels, wherein 2 pixel electrodes (light emitting regions) are close to each other, and through arranging pixel banks with different thicknesses (including a first pixel bank and a second pixel bank, the thickness of the first pixel bank is larger than that of the second pixel bank), the first pixel bank is provided with a first opening (combining ink deposition regions of two adjacent sub-pixels), and the second pixel bank is positioned in the first opening and divides the first opening into two second openings (corresponding to the pixel electrodes of the 2 sub-pixels respectively). The structural arrangement of the pixel unit increases the capacity of the ink deposition area, thereby improving the resolution of the printable substrate.
The display panel comprises a plurality of pixel units, and preferably, in order to prevent the visual angle effect from being affected by increasing the distance between the light emitting areas of the pixel units due to the fact that the light emitting areas of the adjacent sub-pixels are close to each other, the first openings of the two adjacent pixel units are arranged along the long side of the rectangle in a staggered mode, and the display effect can be further improved.
Drawings
FIG. 1 is a schematic cross-sectional view of a pixel unit according to an embodiment;
FIG. 2 is a schematic top view of the pixel unit of FIG. 1;
FIG. 3 is a top view of a display panel according to an embodiment.
Detailed Description
In order that the invention may be more fully understood, reference will now be made to the following description. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
A pixel cell, comprising:
a substrate;
the pixel defining layer is arranged on the substrate in a stacked mode and comprises a first pixel bank and a second pixel bank, the first pixel bank is provided with a first opening, the second pixel bank is located in the first opening and divides the first opening into two second openings, and the thickness of the first pixel bank is larger than that of the second pixel bank;
as can be understood, a flat layer is further stacked between the substrate and the pixel defining layer; the driving circuit is embedded in the flat layer;
two pixel electrodes stacked on the substrate, the two pixel electrodes corresponding to the two second openings, respectively;
a light-emitting functional layer laminated on the pixel electrode and covering the first opening; it is understood that the light emitting function layer includes one or more of a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, and an electron injection layer;
and a top electrode laminated on the light emitting function layer and covering the pixel defining layer.
The pixel unit comprises 2 adjacent same-color sub-pixels, wherein 2 pixel electrodes (light emitting regions) are close to each other, and through arranging pixel banks with different thicknesses (including a first pixel bank and a second pixel bank, the thickness of the first pixel bank is larger than that of the second pixel bank), the first pixel bank is provided with a first opening (combining ink deposition regions of two adjacent sub-pixels), and the second pixel bank is positioned in the first opening and divides the first opening into two second openings (corresponding to the pixel electrodes of the 2 sub-pixels respectively). The structural arrangement of the pixel unit increases the capacity of the ink deposition area, thereby improving the resolution of the printable substrate.
A display panel comprises a plurality of pixel units.
Preferably, the pixel unit is rectangular, and the arrangement of the plurality of pixel units is as follows: two adjacent pixel units are aligned along the short side of the rectangle, and the first openings of the two adjacent pixel units are staggered along the long side of the rectangle.
The display panel comprises a plurality of pixel units, and preferably, in order to prevent the visual angle effect from being affected by increasing the distance between the light emitting areas of the pixel units due to the fact that the light emitting areas of the adjacent sub-pixels are close to each other, the first openings of the two adjacent pixel units are arranged along the long side of the rectangle in a staggered mode, and the display effect can be further improved.
The preparation method of the display panel comprises the following steps:
providing a substrate with a driving circuit;
manufacturing a patterned pixel electrode on the substrate; as can be understood, a flat layer is further manufactured on the substrate, and the driving circuit is embedded in the flat layer;
manufacturing a pixel defining layer on the substrate, wherein the pixel defining layer comprises a first pixel bank and a second pixel bank, the first pixel bank is provided with a first opening, the second pixel bank is positioned in the first opening and divides the first opening into 2 second openings, and the thickness of the first pixel bank is greater than that of the second pixel bank; the pixel electrode corresponds to the second opening;
preferably, the first openings are rectangular, and the adjacent first openings are staggered along the long side of the rectangle;
depositing and manufacturing a light-emitting functional layer on the first opening;
and depositing and manufacturing a top electrode on the light-emitting functional layer, and covering the pixel defining layer.
A display device (OLED or QLED) comprises the display panel.
Example (b):
referring to fig. 1:
a pixel cell 10, comprising:
a substrate 201;
a pixel defining layer, stacked on the substrate 201, including a first pixel bank 204 and a second pixel bank205, wherein the first pixel bank205 has a first opening, the second pixel bank205 is located in the first opening and divides the first opening into two second openings, and a thickness of the first pixel bank 204 is greater than a thickness of the second pixel bank 205; as can be appreciated, the thickness of the first pixel bank 204 is about 0.5 μm to 2 μm; the thickness of the second pixel bank205 is about 0.1 μm to 0.2 μm;
as can be understood, a flat layer 203 is further stacked between the substrate and the pixel defining layer; the driving circuit 208 is embedded in the flat layer; the driving circuit 208 is arranged in a staggered manner with the first opening;
two pixel electrodes 202 stacked on the substrate 201, the two pixel electrodes 202 corresponding to the two second openings, respectively;
a light-emitting functional layer 206 laminated on the pixel electrode 202 and covering the first opening; it is understood that the light emitting function layer 206 may include one or more of a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, and an electron injection layer;
and a top electrode 207 laminated on the light-emitting functional layer 206 and covering the pixel defining layer.
Referring to fig. 2, the pixel unit actually includes adjacent 2 same-color sub-pixels (101 and 102), and 2 pixel electrodes (light emitting regions) 112 and 121 are close to each other, and by disposing pixel banks having different thicknesses (including a first pixel bank having a first opening (corresponding to merging of ink deposition regions of adjacent two sub-pixels) and a second pixel bank having a thickness greater than that of the second pixel bank), the second pixel bank is located in the first opening and divides the first opening into two second openings (corresponding to pixel electrodes of 2 sub-pixels, respectively). The structural arrangement of the pixel unit increases the capacity of the ink deposition area, thereby improving the resolution of the printable substrate.
Referring to fig. 3, a display panel includes a plurality of pixel units 10.
The pixel unit 10 is rectangular, and the arrangement of the pixel units is as follows: two adjacent pixel units are aligned along the short side of the rectangle, and the first openings of the two adjacent pixel units are staggered along the long side of the rectangle. The purpose of this arrangement is to prevent the viewing angle effect from being affected by the increase of the distance between the light emitting areas of the adjacent sub-pixels due to the close proximity of the light emitting areas of the adjacent sub-pixels, and the first openings of the two adjacent sub-pixels are staggered along the long side of the rectangle (so as to avoid the non-light emitting areas (see 111 and 122 in fig. 2) from affecting the display effect in a concentrated manner), which can further improve the display effect.
The preparation method of the display panel comprises the following steps:
providing a substrate with a driving circuit;
manufacturing a patterned pixel electrode on the substrate; as can be understood, a flat layer is further manufactured on the substrate, and the driving circuit is embedded in the flat layer;
manufacturing a pixel defining layer on the substrate, wherein the pixel defining layer comprises a first pixel bank and a second pixel bank, the first pixel bank is provided with a first opening, the second pixel bank is positioned in the first opening and divides the first opening into 2 second openings, and the thickness of the first pixel bank is greater than that of the second pixel bank; the pixel electrode corresponds to the second opening;
as can be understood, the first openings are rectangular in shape, and the adjacent first openings are staggered along the long side of the rectangle;
depositing and manufacturing a light-emitting functional layer on the first opening; it is understood that the light emitting layer may include one or more of a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, and an electron injection layer;
and depositing and manufacturing a top electrode on the light-emitting functional layer, and covering the pixel defining layer.
A display device (OLED or QLED) comprises the display panel.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A pixel cell arrangement structure comprising a plurality of pixel cells, said pixel cells comprising:
a substrate;
the pixel defining layer is arranged on the substrate in a stacked mode and comprises a first pixel bank and a second pixel bank, the first pixel bank is provided with a first opening, the second pixel bank is located in the first opening and divides the first opening into two second openings, and the thickness of the first pixel bank is larger than that of the second pixel bank;
two pixel electrodes stacked on the substrate, the two pixel electrodes corresponding to the two second openings, respectively;
a light-emitting functional layer laminated on the pixel electrode and covering the first opening;
and a top electrode laminated on the light emitting function layer and covering the pixel defining layer;
the pixel units are rectangular, two adjacent pixel units are aligned along the short sides of the rectangle, and the first openings of the two adjacent pixel units are staggered along the long sides of the rectangle;
the pixel unit comprises two adjacent sub-pixels, each sub-pixel comprises a light-emitting area and a non-light-emitting area, the light-emitting areas correspond to the second openings, the light-emitting areas of the two sub-pixels in the same pixel unit are close to each other, and the light-emitting areas and the non-light-emitting areas in the pixel unit arrangement structure are arranged in a staggered mode.
2. The pixel cell arrangement structure according to claim 1, further comprising a planarization layer between the substrate and the pixel defining layer.
3. The pixel unit arrangement structure according to claim 2, further comprising a driving circuit embedded in the planarization layer and disposed in a staggered manner with respect to the first openings.
4. The pixel unit arrangement structure according to any one of claims 1 to 3, wherein the light emitting function layer comprises one or more of a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, and an electron injection layer.
5. A display panel comprising a plurality of the pixel cell arrangement structure according to any one of claims 1 to 4.
6. The method for manufacturing a display panel according to claim 5, comprising the steps of:
providing a substrate with a driving circuit;
manufacturing a patterned pixel electrode on the substrate;
manufacturing a pixel defining layer on the substrate, wherein the pixel defining layer comprises a first pixel bank and a second pixel bank, the first pixel bank is provided with a first opening, the first opening is rectangular, the adjacent first openings are arranged in a staggered mode along the long side of the rectangle, the second pixel bank is located in the first opening and divides the first opening into 2 second openings, and the thickness of the first pixel bank is larger than that of the second pixel bank; the pixel electrode corresponds to the second opening; depositing and manufacturing a light-emitting functional layer on the first opening;
and depositing and manufacturing a top electrode on the light-emitting functional layer, and covering the pixel defining layer.
7. The method according to claim 6, wherein the first pixel bank has a thickness of 0.5 μm to 2 μm, and the second pixel bank has a thickness of 0.1 μm to 0.2 μm.
8. The method of claim 6, further comprising the steps of:
and manufacturing a flat layer on the substrate, wherein the driving circuit is embedded in the flat layer.
9. A display device characterized by comprising the display panel according to claim 5.
10. A display device as claimed in claim 9, characterized in that the display device is an OLED or a QLED.
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| CN201711450016.2A CN108962939B (en) | 2017-12-27 | 2017-12-27 | Pixel unit, display panel and preparation method thereof |
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| CN201711450016.2A CN108962939B (en) | 2017-12-27 | 2017-12-27 | Pixel unit, display panel and preparation method thereof |
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| CN109950282B (en) | 2019-03-25 | 2021-04-13 | 京东方科技集团股份有限公司 | Pixel structure, array substrate and display device |
| CN110350002A (en) * | 2019-06-20 | 2019-10-18 | 深圳市华星光电半导体显示技术有限公司 | Display |
| US20240357873A1 (en) * | 2023-04-19 | 2024-10-24 | Applied Materials, Inc. | Common co-pixel oled device |
| CN119342996A (en) * | 2023-07-20 | 2025-01-21 | 云谷（固安）科技有限公司 | Display panel and display device |
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| US20100181559A1 (en) * | 2008-06-06 | 2010-07-22 | Panasonic Corporation | Organic el display panel and manufacturing method thereof |
| CN105261635A (en) * | 2015-10-29 | 2016-01-20 | Tcl集团股份有限公司 | LED pixel arrangement structure, printing type display device and preparation method of display device |
| CN106449722A (en) * | 2016-11-21 | 2017-02-22 | Tcl集团股份有限公司 | Printing type top-emitting electroluminescent display and preparation method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100181559A1 (en) * | 2008-06-06 | 2010-07-22 | Panasonic Corporation | Organic el display panel and manufacturing method thereof |
| CN105261635A (en) * | 2015-10-29 | 2016-01-20 | Tcl集团股份有限公司 | LED pixel arrangement structure, printing type display device and preparation method of display device |
| CN106449722A (en) * | 2016-11-21 | 2017-02-22 | Tcl集团股份有限公司 | Printing type top-emitting electroluminescent display and preparation method thereof |
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