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- 저자 : Jigeun Nam (검색결과 2 건)
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Improved Stack Structure of Rollable Display to Prevent Delamination and Permanent Deformation
Jigeun Nam,Seunghee Lee,Mijin Han,Hyosung Lee 한국정밀공학회 2021 International Journal of Precision Engineering and Vol.22 No.4
In this study, an improved multi-layer structure was proposed to prevent delamination and permanent deformation in a rollable display. After obtaining the equivalent material properties of the OLED panel using homogenization method, the strain of each layer in rollable display was estimated through fi nite element analysis, and the possibility of delamination and plastic deformation was predicted based on the yield strain in each fi lm layer and the shear strain in adhesives between fi lm layers. As the display module rolls, the difference of displacement between layers accumulates and the shear strain in adhesives increases. The delamination and the permanent deformation has been resolved using high modulus adhesives and hyper-elastic cover fi lm material.
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Jigeun Nam,Tawoo Kim,Jungkyu Park,Eunae Jo,Nadine Wolf,Thomas Strache,Julia Hahn,Schmidt Matthias,Christian Polak 한국정밀공학회 2024 International Journal of Precision Engineering and Vol.25 No.3
Amorphous metal is used in various applications due to high strength, elastic limit, and excellent soft magnetic properties, but fracture characteristics may deteriorate due to surface roughness or defects generated during manufacturing. So, in this study, we have investigated the effect of mechanical surface treatment on the fracture characteristics of amorphous metal foil. Unlike stainless steel sheets manufactured by the rolling process, amorphous metal foils have a rough surface and surface defects such as fine dimples and stripe patterns generated during the manufacturing process. After mechanical surface treatment such as brushing and grinding, surface roughness and mechanical properties of each specimen were compared. Through surface treatment, surface roughness was improved and defects such as dimple were removed. While the surface roughness Ra value of untreated sample was 0.6 on the wheel side and 0.4 on the air side, after surface treatment, the Ra value was lowered to less than 0.2 on both sides. Tensile tests were conducted to compare the mechanical characteristics of specimens. In case of the brushed or grinded samples, fracture strain increased from 1.5 to 1.8%, but no change in the elastic modulus was observed. Folding tests under repeated bending loads also showed that the durability of the surface treated sample was improved. This is considered to be an effect of eliminating surface defects that begin to crack.
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