CN112864201A - Display panel, preparation method thereof and display device - Google Patents
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- CN112864201A CN112864201A CN202110037190.4A CN202110037190A CN112864201A CN 112864201 A CN112864201 A CN 112864201A CN 202110037190 A CN202110037190 A CN 202110037190A CN 112864201 A CN112864201 A CN 112864201A
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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
- H10K59/122—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
Abstract
The invention discloses a display panel, a preparation method thereof and a display device. The display panel comprises an array substrate, a plurality of pixel electrodes arranged on the array substrate and a plurality of pixel defining parts, wherein each pixel defining part is positioned on the corresponding pixel electrode, and each pixel defining part is provided with an opening for exposing the corresponding pixel electrode; wherein a plurality of the pixel defining parts are arranged at intervals. The display panel comprises a plurality of pixel definition parts arranged at intervals, so that the area of the pixel definition parts is reduced, the degassing amount of the organic functional layer is effectively reduced, and the reliability of the display panel is improved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display panel, a preparation method of the display panel and a display device.
Background
The Active-matrix organic light-emitting diode (AMOLED) technology is a development trend in the panel industry, and compared with the Liquid Crystal Display (LCD) technology, the OLED technology has the advantages of simplified structure, wider color gamut, faster response time, and the like. The AMOLED technology is a White organic light-emitting diode (WOLED) with bottom light emission, but the technology adopts an evaporation method to prepare an OLED device, so that the waste of organic light-emitting materials is great; moreover, the WOLED needs a Color Filter (CF) to Filter Color to obtain RGB, so that energy consumption is less than that of a conventional LCD; in addition, low aperture ratio is an inherent defect of the bottom emission structure, which is not favorable for high resolution display applications. Compared with bottom-emitting WOLEDs, the Ink Jet Printing (IJP) technology of top-emitting is more than 80% raw material utilization, RGB color light can be emitted without color filtering with CF, and top-emitting is advantageous for improving aperture ratio. Due to the particularity of the IJP technology, a variety of organic functional materials are required, such as a planarization layer, a hydrophobic layer, etc., and outgassing (out-gas) of these organic functional materials is one of the important factors causing aging of the IJP OLED device.
Disclosure of Invention
An object of the present invention is to provide a display panel including a plurality of pixel defining portions arranged at intervals, which reduces the area of the pixel defining portions, reduces the amount of out-gassing (out-gas) of an organic functional layer, and improves the reliability of the display panel.
In order to achieve the above object, an embodiment of the present invention provides a display panel, which includes an array substrate, a plurality of pixel electrodes disposed on the array substrate, and a plurality of pixel defining portions, each of the pixel defining portions is located on a corresponding one of the pixel electrodes, and each of the pixel defining portions has an opening exposing the corresponding one of the pixel electrodes;
wherein a plurality of the pixel defining parts are arranged at intervals.
In some embodiments, each of the pixel defining parts covers an edge of the corresponding pixel electrode.
In some embodiments, the pixel electrode includes a main body portion, and the pixel defining portion includes a base body portion;
the base portion of the pixel defining portion covers an edge of the main body portion of the pixel electrode.
In some embodiments, the main body portion of the pixel electrode is oblong, and the base body portion of the pixel defining portion is annular.
In some embodiments, the pixel electrode includes a connection portion extending from an outer side of the body portion, and the pixel defining portion includes an extension portion extending from an outer side of the body portion;
the extension portion of the pixel defining portion covers the connection portion of the pixel electrode.
In some embodiments, the connection portion of the pixel electrode is connected to the thin film transistor of the array substrate through a via hole.
The embodiment of the invention provides a preparation method of a display panel, which comprises the following steps:
providing an array substrate;
forming a plurality of pixel electrodes distributed in an array on the array substrate;
forming a pixel defining layer on the array substrate and the plurality of pixel electrodes;
and patterning the pixel defining layer to form a plurality of pixel defining parts arranged at intervals, wherein each pixel defining part is positioned on the corresponding pixel electrode, and each pixel defining part is provided with an opening for exposing the corresponding pixel electrode.
In some embodiments, the pixel electrode includes a main body portion and a connection portion extending from an outer side of the main body portion;
the pixel defining part includes a base portion and an extending portion extending from an outer side of the base portion;
the base portion of the pixel defining part covers an edge of the main body portion of the pixel electrode, and the extending portion of the pixel defining part covers the connecting portion of the pixel electrode.
In some embodiments, the main body portion of the pixel electrode is oblong, and the base body portion of the pixel defining portion is annular.
The embodiment of the invention further provides a display device, which comprises the display panel described in the foregoing embodiment or the display panel prepared by the method described in the foregoing embodiment.
Has the advantages that: the invention discloses a display panel, a preparation method thereof and a display device. The display panel comprises an array substrate, a plurality of pixel electrodes arranged on the array substrate and a plurality of pixel defining parts, wherein each pixel defining part is positioned on the corresponding pixel electrode, and each pixel defining part is provided with an opening for exposing the corresponding pixel electrode; wherein a plurality of the pixel defining parts are arranged at intervals. The display panel comprises a plurality of pixel definition parts arranged at intervals, so that the area of the pixel definition parts is reduced, the degassing amount of the organic functional layer is effectively reduced, and the reliability of the display panel is improved.
Drawings
The technical solution and other advantages of the present invention will become apparent from the following detailed description of specific embodiments of the present invention, which is to be read in connection with the accompanying drawings.
Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 2 a-2 b are schematic structural diagrams of a display panel according to an embodiment of the invention;
fig. 3 a-3 f are flowcharts illustrating a hierarchical structure of a method for fabricating a display panel according to an embodiment of the invention.
Reference numerals:
100-a display panel; 1-an array substrate; 11-a substrate; 12-a thin film transistor; 13-a passivation layer; 14-a planar layer; 2-pixel electrodes; 21-a main body portion; 22-a connecting part; 3-a pixel definition section; 31-a base portion; 32-an extension; 4-a light-emitting layer; 5-first metal layer.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, 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, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the description of the present invention, it should 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; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.
Specifically, referring to fig. 1 to 2b, the present invention provides a display panel 100, where the display panel 100 includes an array substrate 1, a plurality of pixel electrodes 2 disposed on the array substrate 1, and a plurality of pixel defining parts 3, each pixel defining part 3 is located on a corresponding pixel electrode 2, and each pixel defining part 3 is provided with an opening exposing the corresponding pixel electrode 2;
wherein a plurality of the pixel defining parts 3 are arranged at intervals.
The display panel 100 includes an array substrate 11, a plurality of pixel electrodes 2 disposed on the array substrate 11, and a plurality of pixel defining parts 33; the pixel electrodes 2 may be distributed on the array substrate 1 in an array, or may be common pixel electrodes 2 for being connected with a plurality of pixel units; the pixel electrode 2 may be one of ITO/Ag/ITO, Al/WOx, Ag/IZO, etc.;
the array substrate 1 includes a substrate 11, a thin film transistor 12 disposed on the substrate 11, a passivation layer 13 disposed on the substrate 11 and the thin film transistor 12 and covering the thin film transistor 12, and a planarization layer 14 disposed on the passivation layer 13. The substrate 11 may be rigid or flexible; the passivation layer 13 may be an insulating medium prepared by one or a combination of any of SiO2, SiNx, Al2O3, etc. through a Plasma Enhanced Chemical Vapor Deposition (PECVD) method or a sputtering method; the material of the planarization layer 14 may be an organic photoresist, which may be one of PI-based organic photoresists, acrylic-based organic photoresists, etc.
The display panel 100 may be an AMOLED display panel, and in particular, the display panel 100 may be a printing type AMOLED panel in a top emission mode. Various organic functional materials may be used in the film structure of the display panel 100, and the outgassing of the organic functional materials may cause the aging of the OLED device. The pixel defining parts 3 are arranged on the corresponding pixel electrodes 2, and a plurality of pixel defining parts 3 are arranged at intervals; the material of the pixel defining part 3 may be a special organic photoresist, which has good hydrophobicity. Compared with the conventional pixel definition layer which is continuously arranged in the whole layer, the pixel definition parts 3 which are arranged at intervals can reduce the area required by coating, namely, the using amount of the organic functional material is effectively reduced, and the amount of the released degassing is correspondingly reduced, so that the RA service life of the display panel 100 is prolonged, and the reliability of the display panel 100 is improved.
In some embodiments, each of the pixel defining parts 3 covers an edge of the corresponding pixel electrode 2. It is understood that each of the pixel defining parts 3 covers the edge of the corresponding pixel electrode 2 to form an opening of each pixel unit, a light emitting layer 4 is disposed in the opening area, and a first metal layer 5 covers the light emitting layer 4 and the opening area of the pixel defining part 3; the pixel defining part 3 covers the edge portion of the pixel electrode 2, so that the area required for coating can be effectively reduced, the usage amount of organic functional materials and the release amount of outgas are effectively reduced, the influence on the light emitting layer 4 is reduced, and the reliability of the display panel 100 is improved.
In some embodiments, the pixel electrode 2 includes a main body portion 21, and the pixel defining portion 3 includes a base portion 31; the base portion 31 of the pixel defining section 3 covers the edge of the main body portion 21 of the pixel electrode 2. The main body portion 21 of the pixel electrode 2 is oblong, and the base portion 31 of the pixel defining portion 3 is annular.
It is understood that the specific structure of the pixel electrode 2 may include a main body portion 21, and a metal layer may be deposited on the array substrate 1, patterned to form the main body portion 21 of the pixel electrode 2, and then etched away by using an etching process except for the pixel electrode 2. Correspondingly, the specific structure of the pixel defining part 3 may include a base part 31, and the base part 31 covers the edge of the main body part 21 of the pixel electrode 2, so that the amount of the organic functional material used and the amount of outgas released can be effectively reduced, and the reliability of the display panel 100 can be improved. The main body 21 may be oval, the base portion 31 of the pixel defining portion 3 is annular, and an opening region of an oval structure is correspondingly formed in the pixel defining portion 3, so that uniform deposition of ink for inkjet printing is facilitated, and the quality of the display panel 100 is improved.
In some embodiments, the pixel electrode 2 includes a connection portion 22 extending from an outer side of the body portion 21, and the pixel defining portion 3 includes an extension portion 32 extending from an outer side of the base portion 31; the extension portion 32 of the pixel defining portion 3 covers the connection portion 22 of the pixel electrode 2. The connection portion 22 of the pixel electrode 2 is connected to the thin film transistor 12 of the array substrate 1 through a via hole.
It can be understood that the pixel electrode 2 includes a connection portion 22 extending from an outer side of the main body portion 21, the via hole penetrates through the planarization layer 14 and the passivation layer 13 of the array substrate 1, and the connection portion 22 can be electrically connected with the thin film transistor 12 of the array substrate 1 through the via hole, so as to implement control and switching of the driving circuit on the bright and dark states of each pixel. The pixel defining part 3 includes an extension part 32 extending outward from a portion of the base part 31, the extension part 32 completely covers the connection part 22 and corresponds to the shape of the connection part 22 to prevent the connection part 22 from being shorted with the first metal layer 5 at the upper end of the display panel 100; meanwhile, the shapes of the two parts are corresponding, so that the area of the pixel defining part 3 is minimized under the condition that the requirement that the surface of the connecting part 22 is covered is met, the use amount of organic functional materials and the release amount of degassing can be effectively reduced, and the reliability of the display panel 100 is improved.
Referring to fig. 3a to 3f, an embodiment of the invention provides a method for manufacturing a display panel 100, including the following steps:
providing an array substrate 1;
forming a plurality of pixel electrodes 2 on the array substrate 1;
forming a pixel defining layer on the array substrate 1 and the plurality of pixel electrodes 2;
the pixel defining layer is patterned to form a plurality of pixel defining parts 3 arranged at intervals, each pixel defining part 3 is located on the corresponding pixel electrode 2, and each pixel defining part 3 is provided with an opening for exposing the corresponding pixel electrode 2.
It is understood that the preparation of the array substrate 1 includes the following steps: patterning a corresponding electrode position of a Thin Film Transistor (TFT) 12 on a substrate 11 by adopting a photoetching process, and preparing a passivation layer 13 made of an inorganic material by adopting a Plasma Enhanced Chemical Vapor Deposition (PECVD) method;
preparing a planarized organic photoresist planarization layer 14 on the passivation layer 13, and patterning the planarized organic photoresist layer at corresponding positions;
depositing a metal layer on the flat layer 14, patterning the metal layer into a plurality of pixel electrodes 2, and etching the metal layer except the pixel electrode 2 pattern by using an etching process;
the array substrate 1 and the plurality of pixel electrodes 2 are coated with special organic photoresist to form a pixel defining layer, the pixel defining layer is patterned by a photolithography process, and then a plurality of pixel defining parts 3 are arranged at intervals, and each pixel defining part 3 is located on the corresponding pixel electrode 2.
Specifically, the substrate 11 may be made of a rigid material or a flexible material; the passivation layer 13 may be an insulating medium prepared by one or a combination of any of SiO2, SiNx, Al2O3, etc. through a Plasma Enhanced Chemical Vapor Deposition (PECVD) method or a sputtering method; the material of the planarization layer 14 may be an organic photoresist, which may be one of PI-based organic photoresists, acrylic-based organic photoresists, etc. The patterns of the passivation layer 13 and the flat layer 14 can be obtained by adopting a half-tone mask process, the specific steps comprise exposure, development and etching processes, and through holes penetrating through the passivation layer 13 and the flat layer 14 are simultaneously prepared and formed, compared with the existing two-step photoetching method for preparing the passivation layer 13 and the flat layer 14, the number of photomasks can be saved, and the process flow can be simplified. The pixel electrode 2 may be one of ITO/Ag/ITO, Al/WOx, Ag/IZO, etc. The display panel 100 may be an AMOLED display panel, and in particular, the display panel 100 may be a printed AMOLED panel in a top emission mode. A plurality of organic functional materials are used in the multi-film structure of the display panel 100, and the outgassing of the organic functional materials may cause the aging of the OLED device; the pixel defining parts 3 are arranged on the corresponding pixel electrodes 2, and a plurality of pixel defining parts 3 are arranged at intervals; the material of the pixel defining part 3 may be a special organic photoresist, and the special organic photoresist has good hydrophobicity. Compared with the conventional pixel definition layer which is continuously arranged in the whole layer, the pixel definition parts 3 which are arranged at intervals can reduce the area required by coating, namely, the using amount of the organic functional material is effectively reduced, and the amount of the released degassing is correspondingly reduced, so that the RA service life of the display panel 100 is prolonged, and the reliability of the display panel 100 is improved.
In some embodiments, the pixel electrode 2 includes a main body portion 21 and a connection portion 22 extending from an outer side of the main body portion 21;
the pixel defining section 3 includes a base portion 31 and an extending portion 32 extending from an outer side of the base portion 31;
the base portion 31 of the pixel defining portion 3 covers the edge of the main body portion 21 of the pixel electrode 2, and the extension portion 32 of the pixel defining portion 3 covers the connection portion 22 of the pixel electrode 2. The main body portion 21 of the pixel electrode 2 is oblong, and the base portion 31 of the pixel defining portion 3 is annular.
It is understood that the specific structure of the pixel electrode 2 may include a main body portion 21, and a metal layer may be deposited on the array substrate 1, patterned to form the main body portion 21 of the pixel electrode 2, and then etched away by using an etching process except for the pixel electrode 2. Correspondingly, the specific structure of the pixel defining part 3 may include a base part 31, the base part 31 covering the edge of the main body part 21 of the pixel electrode 2 to form an opening of each pixel unit, a light emitting layer 4 disposed in the opening area, and a first metal layer 5 covering the light emitting layer 4 and the opening area of the pixel defining part 3; the pixel defining part 3 covers the edge portion of the pixel electrode 2, so that the area required for coating can be effectively reduced, the usage amount of organic functional materials and the release amount of outgas are effectively reduced, the influence on the light emitting layer 4 is reduced, and the reliability of the display panel 100 is improved. The main body 21 may be in an oval shape, and the base 31 is in an annular shape, and an opening area of the oval structure is correspondingly formed in the pixel defining part 3, which is beneficial to uniform deposition of ink for inkjet printing and improves the quality of the display panel 100.
An embodiment of the present invention further provides a display device, which includes the display panel described in any one of the previous embodiments or the display panel prepared by the method described in any one of the previous embodiments. The display device can be a fixed terminal display device, such as a computer, a household television and intelligent household equipment; or a mobile terminal display device, such as a mobile phone, a tablet computer, a navigator, a digital camera; and may be a wearable terminal display device, such as a sports watch, virtual reality wearable device. The specific structure of the display device can refer to the embodiment of the display panel and fig. 1-2 b as described in any of the previous embodiments, and is not repeated herein.
The invention discloses a display panel, a preparation method thereof and a display device. The display panel comprises an array substrate, a plurality of pixel electrodes arranged on the array substrate and a plurality of pixel defining parts, wherein each pixel defining part is positioned on the corresponding pixel electrode, and each pixel defining part is provided with an opening for exposing the corresponding pixel electrode; wherein a plurality of the pixel defining parts are arranged at intervals. The display panel comprises a plurality of pixel definition parts arranged at intervals, so that the area of the pixel definition parts is reduced, the degassing amount of the organic functional layer is effectively reduced, and the reliability of the display panel is improved.
The display panel, the manufacturing method thereof, and the display device provided in the embodiments of the present invention are described in detail above, and the principles and embodiments of the present invention are explained herein by applying specific examples, and the description of the above embodiments is only used to help understanding the technical solutions and the core ideas of the present invention; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A display panel is characterized in that the display panel comprises an array substrate, a plurality of pixel electrodes arranged on the array substrate, and a plurality of pixel defining parts, wherein each pixel defining part is positioned on the corresponding pixel electrode, and is provided with an opening for exposing the corresponding pixel electrode;
wherein a plurality of the pixel defining parts are arranged at intervals.
2. The display panel according to claim 1, wherein each of the pixel defining parts covers an edge of the corresponding pixel electrode.
3. The display panel according to claim 2, wherein the pixel electrode includes a main body portion, and the pixel defining portion includes a base body portion;
the base portion of the pixel defining portion covers an edge of the main body portion of the pixel electrode.
4. The display panel according to claim 3, wherein the main body portion of the pixel electrode is oblong, and the base body portion of the pixel defining portion is annular.
5. The display panel according to claim 3, wherein the pixel electrode includes a connection portion extending from an outer side of the body portion, and the pixel defining portion includes an extension portion extending from an outer side of the base portion;
the extension portion of the pixel defining portion covers the connection portion of the pixel electrode.
6. The display panel according to claim 5, wherein the connection portion of the pixel electrode is connected to the thin film transistor of the array substrate through a via hole.
7. A method for manufacturing a display panel, the method comprising:
providing an array substrate;
forming a plurality of pixel electrodes on the array substrate;
forming a pixel defining layer on the array substrate and the plurality of pixel electrodes;
and patterning the pixel defining layer to form a plurality of pixel defining parts arranged at intervals, wherein each pixel defining part is positioned on the corresponding pixel electrode, and each pixel defining part is provided with an opening for exposing the corresponding pixel electrode.
8. The method for manufacturing a display panel according to claim 7, wherein the pixel electrode includes a main body portion and a connection portion extending from an outer side of the main body portion;
the pixel defining part includes a base portion and an extending portion extending from an outer side of the base portion;
the base portion of the pixel defining part covers an edge of the main body portion of the pixel electrode, and the extending portion of the pixel defining part covers the connecting portion of the pixel electrode.
9. The method for manufacturing a display panel according to claim 8, wherein the main body portion of the pixel electrode is oblong, and the base body portion of the pixel defining portion is annular.
10. A display device comprising the display panel according to any one of claims 1 to 6 or the display panel produced by the method according to any one of claims 7 to 9.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023039887A1 (en) * | 2021-09-18 | 2023-03-23 | 京东方科技集团股份有限公司 | Display substrate and display device |
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| US20120169217A1 (en) * | 2011-01-03 | 2012-07-05 | Samsung Mobile Display Co., Ltd. | Organic light-emitting display device and method of manufacturing the same |
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