Normally transparent smart window with haze enhancement via inhomogeneous alignment surface

Meng, Cuiling; Tseng, Man Chun; Tang, Shu Tuen; Zhao, Chen; Yeung, Sze Yan; Kwok, Hoi Sing

doi:10.1080/02678292.2018.1508764

Cited by 38 publications

(14 citation statements)

References 31 publications

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“…This is achieved by using a vertical polyimide alignment material (Nissan Chemical SE-4811). The sub-micron sized inhomogeneous alignment layer surface is formed by mixing the vertical PI with a kind of reactive mesogen (DIC UCL 017) followed by temperature induced phase separation and UV curing [5]. Function of this inhomogeneous layer is to enhance the polymer network formation and induce random domain formation in the voltage -on state.…”

Section: Sample Preparationmentioning

confidence: 99%

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26.6: Spectroscopic Response of Polymer Network Liquid Crystal Cell

Tang

Meng

Tseng

et al. 2019

Symp Digest of Tech Papers

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The Polymer Network Liquid Crystal (PNLC) cell we fabricated is operating in a reverse mode of voltage‐off transparent state. It is found that when we apply voltage to the PNLC cells, the transmitted light color changed gradually and finally became a bit blue. This effect is not found in Polymer Dispersed LC (PDLC) window. The wavelength dependent transmittance voltage curves are reported and we will try to explain this effect by applying the anomalous diffraction theory.

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Section: Sample Preparationmentioning

confidence: 99%

“…PNLC samples are prepared by methods introduced in previous section [5]. And the PDLC sample for measurement is a demo unit provided by a local PDLC smart window supplier.…”

Section: Sample Preparationmentioning

confidence: 99%

26.6: Spectroscopic Response of Polymer Network Liquid Crystal Cell

Tang

Meng

Tseng

et al. 2019

Symp Digest of Tech Papers

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“…Recently, the scattering devices draw more and more attention, which is a famous field that many researchers are working on. Some technologies have been primarily applied such as high retardation film, plastic diffuser, polymer dispersed liquid crystal (PDLC) [1] and polymer network liquid crystal (PNLC) [2], etc. However, some components are not switchable.…”

Section: Introductionmentioning

confidence: 99%

39‐2: Student Paper: Fast‐Switchable Scattering Device Based on Liquid‐Crystal Fibonacci Grating

Sun

Yuan

et al. 2021

Symp Digest of Tech Papers

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In this work, we proposed a fast‐switchable quasi‐continuous grating (Fibonacci grating) as the scattering device for viewing angle control. The viewing angle varies from nearly 0 to 30 degrees. The proposed device requires a relatively small driving voltage (<10 V), and shows a fast response time (<7 ms), comparing with traditional scattering devices such as high retardation film, polymer dispersed liquid crystal and polymer network liquid crystal, etc. The proposed device shows promising potential in controllable viewing angle and wavefront coding.

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“…However, the relatively week haze of PSLC in the scattering state, that is, 40–50%, significantly limits its contrast [20]. C. L. Meng et al recently reported a type of reverse mode PSLC window by introducing an inhomogeneous alignment surface [21]. The haze of this window in the voltage on-state can be enhanced, while its contrast is still lower than its counterpart PDLC-based windows.…”

Section: Introductionmentioning

confidence: 99%

Dye-Doped Electrically Smart Windows Based on Polymer-Stabilized Liquid Crystal

Sun

Xie

et al. 2019

Polymers

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Here we report the fabrication of dye-doped polymer-stabilized liquid crystals (PSLC)-based smart windows. The effect of dye doping on PSLC contrast was investigated. Non-dichroic dye tints the PSLC sample in both off- and on-state, which is not beneficial for increasing its off/on contrast. The sample doped with dichroic dye shows a slight color in the off-state and strong color in the on-state, resulting in an enhanced contrast, which attributed to orientation dependent absorption of dichroic dyes. Furthermore, we blended non-dichroic dye and dichroic dye who have complementary absorption together into PSLC mixture. The sample is almost colorless in the off-state due to the subtractive process, while colored in the on-state. The contrast is further enhanced. The results show that the proposed multi-dye-doped PSLC device has high visual contrast and fast response time, making it attractive for applications in light management and architectural aesthetics.

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Normally transparent smart window with haze enhancement via inhomogeneous alignment surface

Cited by 38 publications

References 31 publications

26.6: Spectroscopic Response of Polymer Network Liquid Crystal Cell

26.6: Spectroscopic Response of Polymer Network Liquid Crystal Cell

39‐2: Student Paper: Fast‐Switchable Scattering Device Based on Liquid‐Crystal Fibonacci Grating

Dye-Doped Electrically Smart Windows Based on Polymer-Stabilized Liquid Crystal

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