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Correlation of stress and optical properties in highly transparent polyimides for future flexible display

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Abstract

High transmittance and low birefringence are desirable optical properties in polyimide films which are promising flexible substrates in next generation display devices. However, thermal processes for the fabrication of polyimide films can cause anisotropic changes in the optical properties due to its rod-like molecular structure. Here we report the changes in optical retardation in transparent fluorinated polyimide films with sub-nanometer resolution and dimensional stability induced by deformation at high temperatures. As deformation is increased, the optical retardation is changed much prominently with enhancing thermo-dimensional stability. During thermal strain, in-plane molecular orientation is preferentially improved and stress-optical coefficient that quantifies the change in out of plane optical retardation is derived to be around 6×10–6 m2/N, which is higher compared to conventional plastic optical films. The experimental findings suggest that optimized process conditions for display substrates should be determined to address both changes in the optical and thermal stabilities. We suggest that this study can be useful information for large-scale film process to be further utilized in fabrication of the transparent polyimide films.

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Authors and Affiliations

  1. Analytical Science Group, Samsung Advanced Institute of Technology, Suwon, Gyeonggi, 16678, Korea

    Youngsuk Jung

  2. Film Material Lab, Samsung Advanced Institute of Technology, Suwon, Gyeonggi, 16678, Korea

    Boreum Jeong

  3. Multimedia Processing Lab, Samsung Advanced Institute of Technology, Suwon, Gyeonggi, 16678, Korea

    Yooseong Yang

  4. Department of Civil and Environmental Engineering, Pusan National University, 2, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan, 46241, Korea

    Taeyoon Kim & Soonchul Kwon

Authors
  1. Youngsuk Jung
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  2. Boreum Jeong
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  3. Yooseong Yang
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  4. Taeyoon Kim
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  5. Soonchul Kwon
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Corresponding authors

Correspondence to Yooseong Yang or Soonchul Kwon.

Additional information

Acknowledgments: The authors thank Dr. Tai-gyoo Park for useful discussion. This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (NRF-2016R1C1B2014633). This work was supported by a 2-Year Research Grant of Pusan National University.

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Jung, Y., Jeong, B., Yang, Y. et al. Correlation of stress and optical properties in highly transparent polyimides for future flexible display. Macromol. Res. 25, 971–975 (2017). https://doi.org/10.1007/s13233-017-5126-5

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  • DOI: https://doi.org/10.1007/s13233-017-5126-5

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