Effects of Curing Temperature on Switching Between Transparent and Translucent States in a Polymer-Stabilized Liquid-Crystal Cell

Jeon, Byoung-Gyu; Choi, Tae‐Hoon; Do, Su-Min; Woo, Jiyong; Yoon, Tae–Hoon

doi:10.1109/ted.2018.2864161

Cited by 13 publications

(11 citation statements)

References 31 publications

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“…In the translucent state, a 2-D SmA-LC cell shows a haze value of 92.2%, which is much higher than 74.0% of a 3-wt % PSLC cell and 68.8% of a ChLC cell. A 7-wt % PSLC cell shows the highest haze value of 94.9% in the translucent state, but its transparent state is hazy because of the high concentration of monomer results in the index mismatch between LC and polymer in the transparent state [9]. A ChLC device exhibits low haze value in the transparent state.…”

Section: Resultsmentioning

confidence: 99%

“…Liquid crystal (LC) technologies based on light scattering, such as polymer-stabilized liquid crystals (PSLC), polymer-dispersed liquid crystals (PDLC), and cholesteric liquid crystals (ChLC), have been studied extensively [1][2][3][4][5][6][7][8][9]. In light shutters that employ LC/polymer composites, such as PSLCs and PDLCs, light scattering is induced by the random orientation of LC molecules in polymer structures to obtain a translucent state with a high haze value.…”

Section: Introductionmentioning

confidence: 99%

“…In light shutters that employ LC/polymer composites, such as PSLCs and PDLCs, light scattering is induced by the random orientation of LC molecules in polymer structures to obtain a translucent state with a high haze value. However, these devices have a low transmittance and narrow viewing angle in the transparent state owing to the refractive index mismatch between the LC and polymer structures [9]. In addition, a ChLC cell has shown a low haze value.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

P‐166: Bistable Operation of a Smectic‐A Liquid Crystal Grating for Low‐power Window Display Application

Seo

Huh

Choi

et al. 2019

Symp Digest of Tech Papers

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We report a bistable smectic-A (SmA) liquid crystal (LC) cell with crossed interdigitated electrodes. An SmA-LC cell with crossed interdigitated electrodes is switchable between haze-free transparent and high-haze translucent states. It can be operated with very little power because it consumes power only while the state is being switched. Owing to the high diffraction efficiency, it can provide a high haze value of 92.2% in the translucent state. It has shown a clear transparent state with little haze and excellent optical characteristics in the translucent state. We expect that the device will be used for a window display application.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

P‐166: Bistable Operation of a Smectic‐A Liquid Crystal Grating for Low‐power Window Display Application

Seo

Huh

Choi

et al. 2019

Symp Digest of Tech Papers

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“…Recently, light-shutter technologies, such as liquid crystals (LCs), electrochromic materials, and suspended particles, have been actively studied for automotive, architecture, outdoor, and display applications [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Among them, the LCs have attracted considerable attention because of their promising characteristics, including the ability to control the haze [2][3][4][8][9][10][12][13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

“…Various LC light-shutter technologies have been intensively studied, such as polymer-dispersed [2][3][4], polymer-stabilized [12,17,18], cholesteric [4,8,9], phase-grating [13,16,20], and ion-doped [14,15,19] LCs. Among them, the ion-doped LC cell has various advantages, such as excellent optical performance and a simple switching process [15,19].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Optical Performance Degradation in an Ion-Doped Liquid-Crystal Cell with Electrical Circuit Modeling

et al. 2020

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We reported electrical circuit modeling to analyze the optical performance degradation in an ion-doped liquid-crystal (LC) cell, which exhibited advantages, such as excellent optical performance and simple switching process, but suffered from long-term reliability issues. When an electric field was applied to the cell for an extended period of time, the optical performance became nonuniform, and the haze in the opaque state decreased. By measuring the impedance and fitting the measured data by using an equivalent circuit model, we confirmed the changes of the parameters in the electrochemical impedance spectroscopy and electrophysical properties of the ion-doped LC cell with time. According to the measurement of the optical and physical characteristics, the optical performance degradation was caused mainly by the ionic materials.

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Stable and scalable smart window based on polymer stabilized liquid crystals

Zhang

Yang

et al. 2020

J of Applied Polymer Sci

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A stable and scalable polymer-stabilized liquid crystal window which electrically switches from transparent to opaque has been fabricated. Scanning electron microscope measurement shows that higher polymer concentration will induce denser polymer network in polymer stabilized liquid crystal system and then stronger anchoring force between polymer network and liquid crystal molecules, which resulting in larger operating voltage. The cell with larger cell gap has a lower saturated transmittance in the voltage-on state, which attributed to a larger number of scattering domains in thick cell. The optimized cell exhibits a highly transparent voltageoff state (3.5% haze) and a voltage-on scattering state (98% haze) with the threshold voltage of around 20 V. The durability test shows that the optical device switches at least 100,000 times without degradation of optical contrast and shows a high temperature tolerance. Meanwhile, a 40 × 50 cm 2 window has been developed in an industrial production line showing the same optical properties. Our results demonstrate the fabrication of smart windows with a highly transparent rest state and high optical contrast on a commercial mass production scale, making them attractive for applications in buildings, automobiles, and switchable sunglasses for light management and potentially energy saving.

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Effects of Curing Temperature on Switching Between Transparent and Translucent States in a Polymer-Stabilized Liquid-Crystal Cell

Cited by 13 publications

References 31 publications

P‐166: Bistable Operation of a Smectic‐A Liquid Crystal Grating for Low‐power Window Display Application

P‐166: Bistable Operation of a Smectic‐A Liquid Crystal Grating for Low‐power Window Display Application

Analysis of Optical Performance Degradation in an Ion-Doped Liquid-Crystal Cell with Electrical Circuit Modeling

Stable and scalable smart window based on polymer stabilized liquid crystals

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