For the next generation display, foldable display is one of the attractive candidates. However, the degradation effects due to the mechanical stress on the device are unavoidable. A strain due to the mechanical stress generates cracks on the thin film transistors (TFTs). In this case, if the methodology guiding cracks is applied in the fabrication process, the device reliability can be enhanced. In this paper, a crack guided layer followed by the device fabrication process is deposited on p-type low temperature polycrystalline silicon (LTPS) TFT. Statistical analysis is also used to analyze the crack guided layer effects. To apply a strain on the foldable LTPS TFTS, 5000 cycles of dynamic mechanical stress with tensile and perpendicular directions were applied with 2-mm bending radius. Based on the results, TFT reliability can be enhanced by controlled the crack position using the crack-guided passivation layer.
Bibliographical noteFunding Information:
This research was supported by the LG Display ( 2014-11-1905 ). This work was also supported by Institute of BioMed-IT, Energy-IT and Smart-IT Technology (BEST), a Brain Korea 21 plus program, Yonsei University ( 2017-11-0013 ).
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Safety, Risk, Reliability and Quality
- Condensed Matter Physics
- Surfaces, Coatings and Films
- Electrical and Electronic Engineering