Dye-doped cholesteric liquid crystal light shutter with a polymer-dispersed liquid crystal film

Oh, Seung‐Won; Baek, Jong‐Min; Heo, Joon; Yoon, Tae–Hoon

doi:10.1016/j.dyepig.2016.06.045

Cited by 103 publications

(32 citation statements)

References 16 publications

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“…Recently, see-thr attention as nextcan be used as nformation on a iquid crystals ( polymer stabilize [16][17][18][19][20][21][22][23][24][25], and dye ight shutters, h because of their Moreover, the li because of thei window display operating voltage n this paper, w containing interd driven with inter urn-off switchin he applied elec with crossed in voltage.…”

Section: Introductmentioning

confidence: 97%

P‐144: Sub‐millisecond Switching of Polymer‐stabilized Liquid Crystals with Crossed Patterned Electrodes

Huh

Heo

et al. 2017

Symp Digest of Tech Papers

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We report switching of polymer‐stabilized liquid crystals (PSLCs) with crossed interdigitated electrodes. A PSLC cell with crossed interdigitated electrodes is switchable between the transparent and opaque states, and it exhibits a sub‐millisecond response time and a low operating voltage. In the transparent state, a PSLC cell driven with crossed interdigitated electrodes has high specular transmittance and low haze; in the opaque state, it has low specular transmittance and high haze. The measured turn‐on and turn‐off time of the fabricated PSLC cells were 0.47 ms and 0.46 ms, respectively. We expect that a PSLC cell driven with crossed interdigitated electrodes can be applied to window display applications.

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Section: Introductmentioning

confidence: 97%

P‐144: Sub‐millisecond Switching of Polymer‐stabilized Liquid Crystals with Crossed Patterned Electrodes

Huh

Heo

et al. 2017

Symp Digest of Tech Papers

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“…Transmittance-control devices allow users to control the intensity of transmitted light through the absorption of incident light. Electrochromic devices (ECD) [1][2][3][4], suspended particle devices (SPD) [5,6], and liquid crystal (LC) devices [7][8][9][10][11][12][13] have been studied to control the transmittance of eyewear, smart windows, and automotive applications. ECD and SPD have been widely used because of their low transmittance in the opaque state.…”

Section: Introductionmentioning

confidence: 99%

Parameter Space Design of a Guest-Host Liquid Crystal Device for Transmittance Control

Nam

Kim

et al. 2019

Crystals

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A transmittance-control device requires a high transmittance difference between its transparent and opaque states. In this paper, we propose a systematic approach to find the condition for the maximum transmittance difference in a guest-host liquid crystal (GHLC) cell. To this end, we calculated the transmittance difference as we varied the cell gap and dye concentration. The transmittance of a GHLC cell is dependent on the alignment of dye molecules, cell gap, and dye concentration. We used a constant-transmittance contour map to find the condition for the desired transmittance of LC cells in each state and the transmittance difference of each LC mode. We experimentally confirmed that the design of a GHLC cell with the desired performance could be achieved through the proposed design process.

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“…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 addition, a ChLC cell has shown a low haze value. It requires a complicated drive scheme and has a slow response time [5][6][7]. These characteristics make it difficult to use them as window displays.…”

Section: Introductionmentioning

confidence: 99%

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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Dye-doped cholesteric liquid crystal light shutter with a polymer-dispersed liquid crystal film

Cited by 103 publications

References 16 publications

P‐144: Sub‐millisecond Switching of Polymer‐stabilized Liquid Crystals with Crossed Patterned Electrodes

P‐144: Sub‐millisecond Switching of Polymer‐stabilized Liquid Crystals with Crossed Patterned Electrodes

Parameter Space Design of a Guest-Host Liquid Crystal Device for Transmittance Control

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

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