Advancement trends in dye-doped polymer dispersed liquid crystals—a survey review

ABSTRACT

At present there is significant interest in the doping of various types of dyes into polymer dispersed liquid crystals (PDLCs) in display films. Till to date, various types of dyes have been employed to improve the electro-optical properties of PDLC films in various situations by different research groups. Some of the advantageous features of dye-doped PDLC predict that such dye-doping into the PDLC films resolve the scattering effect, improve the films absorbance, enhance the degree of alignment, stability, and the electro-optical properties of the film such as reflectance, contrast ratio and better transmittance. The current article contains a short review on the present and past studies conducted on the dye-doped polymers dispersed liquid crystals films. The fabrication techniques and their various applications in the different display areas are reviewed, along with the new key findings are discussed.

KEYWORDS:

• Dye-doping
• polymer dispersed liquid crystal (PDLC) films
• liquid crystals
• display application
• contrast ratio

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Acknowledgments

The authors are thankful to the various publishers/authors for granting permission to reproduce Figures 1–18 taken from Elsevier Science Ltd, The Netherlands, and American Institute of Physics, John Willey & Sons, IOP, MDPI, ACS and Taylor & Francis.

Funding

Dr. Farzana Ahmad wishes to acknowledge the support grant provided by the KU-Research Professor Project of Konkuk University in 2016–2018.