CN109616585B - Organic electroluminescent display device and manufacturing method thereof - Google Patents
Organic electroluminescent display device and manufacturing method thereof Download PDFInfo
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Abstract
The invention discloses an organic electroluminescent display device and a manufacturing method thereof, wherein the display device comprises: the substrate base plate is provided with a display area and a non-display area, the non-display area is positioned at the outer side of the display area, and the substrate base plate is provided with an organic light-emitting layer; and an encapsulation layer disposed on the organic light emitting layer and covering the non-display region and the display region; the packaging layer comprises a first inorganic layer, an organic layer and an edge position determining layer, the edge position determining layer and the organic layer are arranged on the first inorganic layer, the edge position determining layer is correspondingly located on a non-display area, the organic layer is located in an area surrounded by the edge position determining layer, the edge of the organic layer extends to the edge position determining layer, the edge position determining layer is used for determining the edge position of the organic layer, and when the organic layer is manufactured through ink jet printing, the edge position of the organic layer extending to the edge position determining layer can be detected according to the edge position determining layer.
Description
Technical Field
The present disclosure relates to display devices, and particularly to an organic electroluminescent display device and a method for fabricating the same.
Background
Currently, Thin Film Encapsulation (TFE) technology has been successfully applied to flexible OLED Encapsulation structures. Generally, the TFE encapsulation structure includes a structure in which a plurality of inorganic water blocking layers (i.e., inorganic layers) and organic buffer layers (i.e., organic layers) are alternately stacked. The organic layer is generally formed by screen printing, ink-jet printing, flash evaporation, etc., wherein the ink-jet printing method is most widely applied due to the advantages of simple process, high deposition speed, good uniformity, etc.
The ink-jet printing method is characterized in that a liquid precursor of an organic layer material is deposited on an inorganic film layer and then is cured. Since the organic layer material has a high transmittance, the boundary of the organic layer is usually not observed, and it is difficult to determine whether the organic layer flows out of the designated area, which is a problem to be solved.
Disclosure of Invention
In order to solve at least one of the above-described technical problems, there is provided an organic electroluminescent display device capable of solving a problem that it is difficult to determine whether an organic layer flows out of a designated area when thin film encapsulation.
The invention also provides a manufacturing method of the organic electroluminescent display device.
The present invention provides an organic electroluminescent display device comprising: a substrate having a display region and a non-display region, the non-display region being located outside the display region; and an encapsulation layer disposed on the substrate and covering the non-display area and the display area; the encapsulation layer comprises an edge position determining layer and an organic layer, the edge position determining layer is correspondingly located on the non-display area, the organic layer is located in an area surrounded by the edge position determining layer, the edge of the organic layer extends to the edge position determining layer, and the edge position determining layer is used for determining the edge position of the organic layer.
Optionally, the refractive index of the edge position determination layer is different from the refractive index of the organic layer.
Optionally, the refractive index of the edge position determination layer is greater than the refractive index of the organic layer.
Optionally, the refractive index of the material of the organic layer is 1.4-1.5, and the refractive index of the material of the edge position determining layer is 1.8-2.0.
Optionally, the edge position determination layer includes a plurality of organic material detection ring layers nested inside and outside.
Optionally, the width of the edge position determination layer is 5-10 μm.
Optionally, a pixel array is disposed on the substrate, a region where the pixel array is located is the display region, and a region outside the pixel array is the non-display region.
Optionally, the encapsulation layer includes: a first inorganic layer disposed on the substrate base plate; the edge position determination layer and the organic layer are disposed on the first inorganic layer; and a second inorganic layer disposed on the first inorganic layer and covering the edge position determining layer and the organic layer with the first inorganic layer.
The invention provides a manufacturing method of an organic electroluminescent display device, which comprises the following steps:
manufacturing a first inorganic layer on a substrate;
manufacturing an edge position determining layer on the first inorganic layer, and enabling the edge position determining layer to be correspondingly positioned in a non-display area of the substrate base plate;
manufacturing an organic layer in a region surrounded by the edge position determining layer by adopting an ink-jet printing method, determining the edge position of the organic layer flowing to the edge position determining layer according to the edge position determining layer, and preventing the edge of the organic layer from overflowing out of the organic material layer;
and a second inorganic layer is formed on the first inorganic layer, and the first inorganic layer and the second inorganic layer cover the edge position determination layer and the organic layer.
Optionally, the refractive index of the edge position determining layer is different from the refractive index of the organic layer, and the edge position of the organic layer is determined according to the edge position determining layer by using a refractometer, an ellipsometer or an optical microscope.
Compared with the prior art, the organic electroluminescent display device provided by the invention has the advantages that the edge position determining layer is correspondingly positioned on the non-display area, the organic layer is positioned in the area surrounded by the edge position determining layer, and the edge of the organic layer extends to the edge position determining layer.
Additional features and advantages of the disclosure will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the disclosure. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the embodiments herein and are incorporated in and constitute a part of this specification, illustrate embodiments herein and are not to be construed as limiting the embodiments herein.
Fig. 1 is a schematic sectional view of a front view structure of an organic electroluminescent display device according to an embodiment of the present invention;
fig. 2 is a schematic top view of the organic layer and the edge position determination layer of fig. 1.
Wherein, the correspondence between the reference numbers and the component names in fig. 1 and fig. 2 is:
1 substrate, 11 display area, 12 non-display area, 21 edge position determination layer, 22 organic layer, 3 first inorganic layer, 4 second inorganic layer, 5 barrier dam, 6 organic light emitting layer.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, however, the present disclosure may be practiced otherwise than as specifically described herein, and thus the scope of the present disclosure is not limited by the specific embodiments disclosed below.
The present invention provides an organic electroluminescent display device, as shown in fig. 1 and 2, comprising: a substrate 1 having a display region 11 and a non-display region 12, the non-display region 12 being located outside the display region 11, the substrate 1 being provided with an organic light-emitting layer 6; and an encapsulation layer disposed on the substrate base plate 1 and covering the non-display area 12 and the display area 11; the encapsulation layer comprises a first inorganic layer 3, a second inorganic layer 4, an edge position determining layer 21 and an organic layer 22, the edge position determining layer 21 and the organic layer 22 are arranged on the first inorganic layer 3, the second inorganic layer 4 is arranged on the first inorganic layer 3 and coats the edge position determining layer 21 and the organic layer 22 with the first inorganic layer 3, the edge position determining layer 21 is correspondingly arranged on the non-display area 12, the organic layer 22 is arranged in the area enclosed by the edge position determining layer 21, the edge of the organic layer 22 extends to the edge position determining layer 21, and the edge position determining layer 21 is used for determining the edge position of the organic layer 22.
In the organic electroluminescent display device, the edge position determining layer 21 is correspondingly located on the non-display area 12, the organic layer 22 is located in the area enclosed by the edge position determining layer 21, and the edge of the organic layer 22 extends to the edge position determining layer 21, when the organic layer 22 is manufactured by ink-jet printing, the edge position of the organic layer 22 extending to the edge position determining layer is detected according to the edge position determining layer 21 so as to prevent the organic layer 22 from flowing out of the edge position determining layer 21 beyond the edge position determining layer 21 (the edge of the organic layer 22 can be prevented from flowing out of the edge position determining layer 21 by controlling the printing range of the ink-jet printing process), and in the process, the edge position determining layer 21 can also play a role in slowing down the outward overflow of the organic layer 22.
Alternatively, the refractive index of the edge position determining layer 21 is different from the refractive index of the organic layer 22, the edge of the organic layer 22 flowing onto the edge position determining layer 21 may cause a change in properties such as thickness and refractive index of the upper portion of the edge position determining layer 21, the change may reflect a change in optical properties, the flow stop position of the edge of the organic layer 22 on the edge position determining layer 21 may be determined according to the change in optical properties, and the edge position of the organic layer 22 may be observed (or determined) on the edge position determining layer 21 using an optical testing device such as a refractometer, an ellipsometer, or an optical microscope.
In an exemplary embodiment, it may be that the refractive index of the edge position determining layer 21 is greater than the refractive index of the organic layer 22. Such as: the refractive index of the material of the organic layer 22 is 1.4-1.5, the refractive index of the material of the edge position determining layer 21 is 1.8-2.0, and the material of the edge position determining layer 21 may be ferric sulfate, alumina, or the like. Of course, the organic layer 22 and the edge position determining layer 21 with refractive indexes of other values may be used to achieve the object of the present application, which is not departing from the design concept of the present invention and will not be described herein again and shall also fall within the protection scope of the present application.
The object of the present application can also be achieved by making the refractive index of the edge position determining layer 21 smaller than the refractive index of the organic layer 22, which is not described herein and is within the protection scope of the present application.
As shown in fig. 2, the edge position determining layer 21 may include a plurality of organic material detecting ring layers, two, three, or four, which are nested inside and outside, and may comprehensively and effectively detect the flow stop position of the edge of the organic layer 22 on the edge position determining layer 21. Of course, as shown in fig. 1, the edge position determining layer 21 may be only one organic material detection ring layer, and the purpose of the present application may also be achieved.
Specifically, the width of the edge position determining layer 21 is 5-10 μm, such as 5 μm, 8 μm, or 10 μm, and the width of the non-display region 12 can be ensured to be narrower, so that the display device is more beautiful, and the narrow frame design is better satisfied.
Specifically, as shown in fig. 1, a pixel array is disposed on a substrate 1, the area where the pixel array is located is a display area 11, and the area outside the pixel array is a non-display area 12. The substrate 1 is further provided with a thin film transistor array, a circuit, an organic light emitting layer 6, and the like, wherein the organic light emitting layer 6 is disposed in a display region 11 (corresponding to a region between two dotted lines in fig. 1) and corresponds to a pixel array, that is, an outer side of the organic light emitting layer 6 is a non-display region 12 (corresponding to a region outside the two dotted lines in fig. 1).
Specifically, the first inorganic layer 3 and the second inorganic layer 4 may be fabricated using a plasma enhanced vapor deposition method or an atomic deposition method.
When the encapsulation layer is manufactured, after the first inorganic layer 3 is manufactured, the annular edge position determining layer 21 is arranged on the first inorganic layer 3 near the edge, at this time, the edge position determining layer 21 corresponds to the non-display area 12 of the substrate 1, then the organic layer 22 is manufactured in the area surrounded by the edge position determining layer 21 by adopting an ink-jet printing method, the edge position determining layer 21 is observed by optical testing equipment such as a refractometer, an ellipsometer or an optical microscope, and after the edge of the organic layer 22 flows onto the edge position determining layer 21, the staying position of the edge of the organic layer 22 on the edge position determining layer 21 is determined according to the change of optical properties, so that the organic layer 22 is prevented from overflowing out of the edge position determining layer 21 during ink-jet printing, and the second inorganic layer 4 is manufactured after the organic layer 22 is manufactured.
The non-display area 12 may be provided with a blocking dam 5, and the edge position determining layer 21 is positioned inside the blocking dam 5.
The present invention provides a method for fabricating an organic electroluminescent display device (not shown in the drawings), comprising:
manufacturing an organic light emitting layer 6 on a substrate 1;
fabricating a first inorganic layer 3 on the organic light emitting layer 6;
manufacturing an edge position determination layer 21 on the first inorganic layer 3, and enabling the edge position determination layer 21 to be located in the non-display area 12 of the substrate base plate 1;
manufacturing an organic layer 22 in a region surrounded by the edge position determining layer 21 by using an inkjet printing method, determining the edge position of the organic layer 22 flowing onto the edge position determining layer 21 according to the edge position determining layer 21, and preventing the edge of the organic layer 22 from overflowing out of the organic material layer;
the second inorganic layer 4 is formed on the first inorganic layer 3, and the edge position determining layer 21 and the organic layer 22 are coated with the first inorganic layer 3 and the second inorganic layer 4.
The manufacturing method of the organic electroluminescent display device provided by the invention has simple process, when the organic layer 22 is manufactured by ink-jet printing, the edge position of the organic layer 22 extending to the edge position determining layer 21 is detected, the edge position determining layer 21 also slows down the outward overflow of the organic layer 22, and the organic layer 22 is prevented from flowing out of the edge position determining layer 21 beyond the edge position determining layer 21.
Of course, when the edge position of the organic layer 22 is detected, the edge position of the organic layer 22 may be prevented from flowing out of the edge position determination layer 21 by controlling the printing range of the inkjet printing process.
The substrate base plate 1 has a pixel array, a thin film transistor array, a circuit, and the like thereon.
Specifically, the refractive index of the edge position determining layer 21 is different from the refractive index of the organic layer 22, and the flow stop position of the edge of the organic layer 22 on the edge position determining layer 21 is determined from the edge position determining layer 21 using an optical testing apparatus such as a refractometer or an ellipsometer or an optical microscope, so that the edge of the organic layer 22 is positioned on the edge position determining layer 21.
The refractive index of the edge position determining layer 21 is different from the refractive index of the organic layer 22, and a change in properties such as the thickness and the refractive index of the edge position determining layer 21 may reflect a change in optical properties, and a stop position of the edge of the organic layer 22 on the edge position determining layer 21 may be obtained according to the change in optical properties, and the edge position of the organic layer 22 may be observed (or determined) on the edge position determining layer 21 using an optical testing device such as a refractometer, an ellipsometer, or an optical microscope.
In summary, in the organic electroluminescent display device provided by the present invention, the edge position determining layer is correspondingly located on the non-display area, the organic layer is located in the area surrounded by the edge position determining layer, and the edge of the organic layer extends to the edge position determining layer, when the organic layer is manufactured by inkjet printing, the edge position of the organic layer extending to the edge position determining layer is detected according to the edge position determining layer, and meanwhile, the edge position determining layer can also slow down the outward overflow of the organic layer, and then the inkjet printing process is controlled in cooperation to prevent the organic layer from flowing out of the edge position determining layer beyond the edge position determining layer.
In the description herein, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., "connected" may be a fixed connection, a removable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms herein can be understood by those of ordinary skill in the art as appropriate.
In the description of the specification, reference to the term "one embodiment," "some embodiments," "a specific embodiment," or the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example herein. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although the embodiments disclosed herein are described above, the descriptions are only for the convenience of understanding the embodiments and are not intended to limit the disclosure. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure, and that the scope of the disclosure herein may be limited only by the appended claims.
Claims (7)
1. An organic electroluminescent display device, comprising:
a substrate having a display region and a non-display region, the non-display region being located outside the display region; and
an encapsulation layer disposed on the substrate and covering the non-display area and the display area;
the barrier dam is arranged on the substrate base plate, is positioned in the non-display area and is covered by the packaging layer;
wherein the encapsulation layer includes a first inorganic layer, an edge position determination layer and an organic layer, the edge position determination layer and the organic layer are disposed on the first inorganic layer, the edge position determination layer is correspondingly disposed on the non-display area and inside the barrier dam, the organic layer is disposed in the area surrounded by the edge position determination layer, and the edge of the organic layer extends to the edge position determination layer, and the encapsulation layer further includes: a second inorganic layer disposed on the first inorganic layer and covering the edge position determining layer and the organic layer with the first inorganic layer; the refractive index of the edge position determining layer is different from that of the organic layer, the edge position determining layer is used for determining the flow stopping position of the organic layer according to the optical property change caused by the change of the thickness and the refractive index of the edge position determining layer when the edge flow of the organic layer stops on the edge position determining layer, and the edge position determining layer comprises a plurality of organic material detection ring layers which are nested inside and outside;
the section of the edge position determining layer is trapezoidal, the edge of the organic layer extends to the lower bottom edge of the trapezoid, which is in contact with the first inorganic layer, and the organic layer does not extend to the upper bottom edge of the trapezoid, which is in contact with the second inorganic layer;
when the organic layer is manufactured by ink-jet printing, the edge position of the organic layer extending to the edge position determining layer is detected according to the edge position determining layer, meanwhile, the edge position determining layer slows down the outward overflow of the organic layer, and the ink-jet printing process is controlled in a matched mode to prevent the organic layer from flowing out of the edge position determining layer beyond the edge position determining layer.
2. The organic electroluminescent display device according to claim 1, wherein the refractive index of the edge position determination layer is greater than the refractive index of the organic layer.
3. The organic electroluminescent display device according to claim 2, wherein the organic layer has a material refractive index of 1.4 to 1.5, and the edge position determination layer has a material refractive index of 1.8 to 2.0.
4. The organic electroluminescent display device according to claim 1, wherein the width of the edge position determination layer is 5 to 10 μm.
5. The organic electroluminescent display device according to claim 1, wherein a pixel array is disposed on the substrate base plate, the area where the pixel array is located is the display area, and the area outside the pixel array is the non-display area.
6. A method of fabricating an organic electroluminescent display device, comprising:
forming a barrier dam on a substrate base plate, the barrier dam being located in a non-display area of the substrate base plate
Manufacturing a first inorganic layer on a substrate, wherein the first inorganic layer covers the barrier dam;
manufacturing an edge position determining layer on the first inorganic layer, and enabling the edge position determining layer to be correspondingly positioned in a non-display area of the substrate base plate, wherein the edge position determining layer is positioned on the inner side of the barrier dam;
manufacturing an organic layer in a region surrounded by the edge position determining layer by adopting an ink jet printing method, determining the edge position of the organic layer flowing onto the edge position determining layer according to the change of optical properties caused by the change of the thickness and the refractive index of the edge position determining layer, slowing down the outward overflow of the organic layer by the edge position determining layer, and preventing the edge of the organic layer from overflowing out of the edge position determining layer by matching with the control of an ink jet printing process;
manufacturing a second inorganic layer on the first inorganic layer, and enabling the first inorganic layer and the second inorganic layer to coat the edge position determining layer and the organic layer, wherein the refractive index of the edge position determining layer is different from that of the organic layer, and the edge position determining layer comprises a plurality of organic material detection ring layers which are nested inside and outside;
the section of the edge position determination layer is trapezoidal, the edge of the organic layer extends to the lower bottom edge of the trapezoid, which is in contact with the first inorganic layer, and the organic layer does not extend to the upper bottom edge of the trapezoid, which is in contact with the second inorganic layer.
7. The method of manufacturing an organic electroluminescent display device according to claim 6, wherein the edge position of the organic layer is determined from the edge position determination layer using a refractometer or an ellipsometer or an optical microscope.
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| CN110634927B (en) * | 2019-09-26 | 2022-08-09 | 京东方科技集团股份有限公司 | Display panel, preparation method thereof and display device |
| CN112310317B (en) * | 2020-10-30 | 2024-03-15 | 京东方科技集团股份有限公司 | Display panel testing component and preparation method thereof |
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| CN107768402A (en) * | 2016-08-23 | 2018-03-06 | 陈扬证 | Display panel with retention device |
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