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Researchers Submit Patent Application, "Stretchable Base Plate, Stretchable Organic Light-Emitting Display Device Using the Same, and Method of...

June 12, 2014



Researchers Submit Patent Application, "Stretchable Base Plate, Stretchable Organic Light-Emitting Display Device Using the Same, and Method of Manufacturing the Stretchable Base Plate and the Stretch

By a News Reporter-Staff News Editor at Politics & Government Week -- From Washington, D.C., VerticalNews journalists report that a patent application by the inventors Lee, Chang-Hoon (Yongin-City, KR); Hong, Jong-Ho (Yongin-City, KR); Park, Won-Sang (Yongin-City, KR); Baek, Jong-In (Yongin-City, KR), filed on March 14, 2013, was made available online on May 29, 2014.

The patent's assignee is Samsung Display Co., Ltd.

News editors obtained the following quote from the background information supplied by the inventors: "Embodiments of the present invention relate to an organic light-emitting display device and a method of manufacturing the same.

"Conventionally, an organic light-emitting display device may display colors when electrons and holes, which are respectively injected from an anode and a cathode, recombine to emit light. The organic light-emitting display device has a structure formed by stacking an anode electrode and a cathode electrode with a light-emitting layer inserted therebetween.

"Recently, there have been attempts to implement an organic light-emitting display device that has a stretchable structure. That is, it is desirable to form an organic light-emitting display device to extend/expand or shrink, as well as bend, when the organic light-emitting display device is pulled.

"To enable stretchable characteristics, a stretchable substrate may be used. However, when the substrate is stretched, cracks may be generated in a metal electrode(s) of the substrate. That is, even if the substrate is stretchable, the metal electrode is not equally stretchable. Therefore, cracks may be generated in the metal electrode due to stress caused by extension, shrinkage, or bending of the substrate.

"Accordingly, it may be useful to develop a structure for preventing cracks in the metal electrode when the substrate is stretched or bent to provide a stretchable organic light-emitting display device."

As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventors' summary information for this patent application: "Embodiments of the present invention provide a stretchable base plate that is improved to be stretched without generating cracks in a metal electrode, a stretchable organic light-emitting display device using the same, and a method of manufacturing the stretchable base plate and the stretchable organic light emitting display device.

"According to an aspect of embodiments of the present invention, there is provided a stretchable base plate including a stretchable substrate, metal electrodes that are separated and located in a plurality of rows on the stretchable substrate, and a power wiring for electrically coupling respective ones of the metal electrodes in each row.

"The stretchable substrate may include a stack of several layers of unit substrates.

"The stretchable substrate may include polydimethylsiloxane (PDMS).

"The metal electrodes may include aluminum.

"The power wiring may include silver nanowires.

"According to an aspect of embodiments of the present invention, there is provided a stretchable organic light-emitting display device including a stretchable base plate including a stretchable substrate, first metal electrodes that are separated from each other and located in a plurality of rows on a the stretchable substrate, and first power wirings electrically coupling respective ones of the metal electrodes of each row, a light-emitting layer on the stretchable base plate, second metal electrodes located in a plurality of rows on the light-emitting layer and corresponding to the first metal electrodes, second power wirings for electrically coupling respective ones of the second metal electrodes of each row, and an encapsulation substrate covering the second power wiring.

"The stretchable substrate may include a plurality of unit substrates stacked in layers, and each row of the first metal electrodes may correspond to a respective one of the unit substrates.

"The stretchable substrate and the encapsulation substrate may include polydimethylsiloxane (PDMS).

"The first and second metal electrodes may include aluminum.

"The first power wirings and the second power wirings may include silver nanowires.

"According to an aspect of the present invention, there is provided a method of manufacturing a stretchable base plate, the method including forming power wirings in a plurality of rows on a stretchable unit substrate, forming metal electrodes on the power wirings, stacking several stretchable unit substrates each including respective ones of the power wirings and the metal electrodes, and cutting the stack to separate the rows of the power wirings on respective ones of the stretchable unit substrates.

"The metal electrodes may include a plurality of separated pieces after the stack is cut.

"The stretchable substrate may include polydimethylsiloxane (PDMS).

"The metal electrodes may include aluminum.

"The power wirings may include silver nanowires.

"According to an aspect of embodiments of the present invention, there is provided a method of manufacturing a stretchable organic light-emitting display device, the method including preparing a stretchable base plate including a stretchable substrate, first metal electrodes including separate pieces in a plurality of rows on the stretchable substrate, and first power wirings electrically coupling respective ones of the first metal electrodes of each row, forming a light-emitting layer on the stretchable base plate, forming second metal electrodes in a plurality of rows on the light-emitting layer to correspond to the first metal electrodes, forming second power wirings electrically coupling respective ones of the second metal electrodes of each row, and covering the second power wirings with an encapsulation substrate.

"The preparing of the stretchable base plate may include forming the first power wirings in a plurality of rows on respective ones of stretchable unit substrates, forming the first metal electrodes on the first power wiring, stacking a plurality of stretchable unit substrates in layers, and forming the stretchable substrate by cutting the stack of the stretchable unit substrates along a direction parallel to the rows of the first power wirings.

"The stretchable substrate and the encapsulation substrate may include polydimethylsiloxane (PDMS).

"The first metal electrode and the second metal electrode may include aluminum.

"The first power wirings and the second power wirings may include silver nanowires.

"According to embodiments of the present invention for providing the stretchable base plate, the stretchable organic light emitting display device, and the method of manufacturing the stretchable base plate, cracks in metal electrodes are reduced or prevented during stretching or bending. Thus, a stretchable product may be implemented.

BRIEF DESCRIPTION OF THE DRAWINGS

"The above and other aspects of embodiments of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings in which:

"FIG. 1 is a cross-sectional view of a stretchable organic light-emitting display device according to an embodiment of the present invention; and

"FIGS. 2A through 2K are diagrams illustrating a method of manufacturing the stretchable organic light-emitting display device of the embodiment shown in FIG. 1."

For additional information on this patent application, see: Lee, Chang-Hoon; Hong, Jong-Ho; Park, Won-Sang; Baek, Jong-In. Stretchable Base Plate, Stretchable Organic Light-Emitting Display Device Using the Same, and Method of Manufacturing the Stretchable Base Plate and the Stretchable Organic Light Emitting Display Devi. Filed March 14, 2013 and posted May 29, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=5289&p=106&f=G&l=50&d=PG01&S1=20140522.PD.&OS=PD/20140522&RS=PD/20140522

Keywords for this news article include: Aluminum, Nanowire, Light Metals, Nanotechnology, Emerging Technologies, Samsung Display Co. Ltd.

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Politics & Government Week


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