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Applied Physics Letters / Volume 98 / Issue 15 / STRUCTURAL, MECHANICAL, THERMODYNAMIC, AND OPTICAL PROPERTIES OF CONDENSED MATTER

Appl. Phys. Lett. 98, 151904 (2011); http://dx.doi.org/10.1063/1.3576906 (3 pages)

Mechanically and optically reliable folding structure with a hyperelastic material for seamless foldable displays

Hyuk-Jun Kwon, HongShik Shim, Sunkook Kim, Woong Choi, Youngtea Chun, InSeo Kee, and SangYoon Lee

Samsung Advanced Institute of Technology, Mt. 14-1, Nongseo-dong, Giheung-gu, Yongin-Si, Gyeonggi-do, Republic of Korea

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(Received 21 February 2011; accepted 13 March 2011; published online 11 April 2011)

We report a mechanically and optically robust folding structure to realize a foldable active matrix organic-light-emitting-diode (AMOLED) display without a visible crease at the junction. A nonlinear stress analysis, based on a finite element method, provided an optimized design. The folding-unfolding test on the structure exhibited negligible deterioration of the relative brightness at the junction of the individual panels up to 105 cycles at a folding radius of 1 mm, indicating highly reliable mechanical and optical tolerances. These results demonstrate the feasibility of seamless foldable AMOLED displays, with potentially important technical implications on fabricating large size flexible displays.

© 2011 American Institute of Physics

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KEYWORDS and PACS

Keywords

brightness, finite element analysis, LED displays, organic light emitting diodes, stress analysis

PACS

  • 42.79.Kr

    Display devices, liquid-crystal devices

  • 85.60.Jb

    Light-emitting devices

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3576906

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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    References

    H. J. Kim, C. W. Son, and B. Ziaie, Appl. Phys. Lett. 92, 011904 (2008)APPLAB000092000001011904000001.


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Figures (4)

Figures (click on thumbnails to view enlargements)

FIG.1
Schematic view of (a) the structure of the folding window module for proposed foldable AMOLED display and (b) the fully folded state of the folding window module at 180°.

FIG.1 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.2
(a) Photographic images on the screen of prototype foldable AMOLED display without visible crease and (b) the change in luminance at the interface between a glass and a silicone rubber.

FIG.2 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.3
(a) Uniaxial tensile stress-strain curve of the hyperelastic material (LSR 7060) in the whole strain range; (b) cyclic uniaxial tensile stress-strain curve; and (c) cyclic biaxial tensile stress-strain curve for the strains of 25% and 50%.

FIG.3 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.4
(a) FEM model design of a half of the folding window module at the final state after folding at 90° and (b) the results of FEM analysis and range of adhesive tolerance with respect to occurred stress at the folding window module; (c) the change in the relative brightness during 105 cycles of folding-unfolding test with L (3 mm) and t (0.7 mm) in the green region in (b).

FIG.4 Download High Resolution Image (.zip file) | Export Figure to PowerPoint



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