Transmittance control of a liquid crystal device using a dye mixture

Seong-Min Ji; Seung-Won Oh; Young-Seo Jo; Seung-Min Nam; Sang-Hyeok Kim; Jae-Won Huh; Eunjung Lim; JinHong Kim; Tae-Hoon Yoon

doi:10.1117/12.2322716

14 September 2018 Transmittance control of a liquid crystal device using a dye mixture

Seong-Min Ji, Seung-Won Oh, Young-Seo Jo, Seung-Min Nam, Sang-Hyeok Kim, Jae-Won Huh, Eunjung Lim, JinHong Kim, Tae-Hoon Yoon

Author Affiliations +

Proceedings Volume 10735, Liquid Crystals XXII; 107351A (2018) https://doi.org/10.1117/12.2322716
Event: SPIE Organic Photonics + Electronics, 2018, San Diego, California, United States

Abstract

Transmittance-control devices, such as a suspended particle device, electrochromic device, and dye-doped liquid crystal (LC) device, have been studied for a smart window, eyewear, and automotive applications. These devices require a high transmittance difference between the transparent and opaque states. Among the dye-doped LC devices, a dye-doped chiral-nematic LC (CNLC) cell has been widely used for transmittance-control devices. However, the colors of cells are different between the homogeneously aligned and CNLC cell. In this study, we demonstrated a systematic approach to find optimum dye concentrations for black color in a dye-doped CNLC cell. We took its transmission spectrum into account in the numerical calculation to realize the black color in a dye-doped CNLC cell. Through the iterative method, we could optimize the concentration of each single dye for realizing the black color. We confirmed that a dye-doped CNLC cell designed by considering transmission spectrum of it could provide the black color in the CIE 1931 color space.

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Seong-Min Ji, Seung-Won Oh, Young-Seo Jo, Seung-Min Nam, Sang-Hyeok Kim, Jae-Won Huh, Eunjung Lim, JinHong Kim, and Tae-Hoon Yoon "Transmittance control of a liquid crystal device using a dye mixture", Proc. SPIE 10735, Liquid Crystals XXII, 107351A (14 September 2018); https://doi.org/10.1117/12.2322716

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KEYWORDS

Liquid crystals

Transmittance

Absorption

Control systems

CIE 1931 color space

LCDs

Eyewear

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