Investigation of mechanical bending instability in flexible low-temperature-processed electrochromic display devices

Chin Pao Cheng, Chuan Pu Chou, Che Hsiang Hsu, Tun Chien Teng, Chun Hu Cheng, Yu Yang Syu

Research output: Contribution to journalArticle

4 Citations (Scopus)


In this study, polyethylene naphthalate (PEN) was investigated as a flexible substrate because, compared with polyethylene terephthalate, it achieves a lower root mean square roughness and transmittance, which is favorable for reducing leakage from the bottom of flexible substrates. A flexible device structure composed of tungsten oxide/indium-doped tin oxide/PEN was used in an electrochromic (EC) test. The experimental results show that the flexible EC display device achieved a high transmittance difference of > 40% and color efficiency of 70.2 cm2/C at 560 nm. The transmittance difference was degraded in the visible range after 200 cycles of continuous bending. Furthermore, compared with flat fresh devices, the WO3 device exhibited poor retention properties in a colored state after being subjected to longer bending cycles.

Original languageEnglish
Pages (from-to)94-97
Number of pages4
JournalThin Solid Films
Publication statusPublished - 2015 Jun 1



  • Bending
  • Electrochromic
  • Flexible substrate
  • Tungsten oxide

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

Cite this