Hybrid aligned nematic liquid crystal smart glass with asymmetrical daylight controls

Yamaguchi, Rumiko; Takasu, Tomoya

doi:10.1002/jsid.319

Cited by 16 publications

(12 citation statements)

References 27 publications

(29 reference statements)

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“…Figure 6 shows a schematic model of the polymer structure with large and small LC domains. It is well known that the weak UV intensity makes large LC domains in the PDLC system [16][17][18][19][20]. When the UV intensity decreases with passing through the LC bulk, the LC domain size becomes lager.…”

Section: Resultsmentioning

confidence: 99%

Driving Voltage in Reverse Mode Cell Using Reactive Mesogen : Effect of UV Absorption of Liquid Crystal

Yamaguchi

Sasaki

Inoue

2018

J. Photopol. Sci. Technol.

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We have proposed reverse mode liquid crystal (LC) cells by using a polymer stabilized LC technology. A reactive mesogen was dissolved in the LC and was polymerized by UV light from an Hg lamp (313 nm) and a UV-LED (365 nm) light sources. LC materials with and without UV absorption at each wavelength were prepared and electro-optical properties of the reverse mode cell were measured. It was found that the electro-optical property strongly depended on the UV absorption of the LC. Next we mixed LCs with and without UV absorption to adjust the UV intensity profile in the bulk of the LC cell. We successfully reduced the driving voltage by changing the absorption coefficient of LC mixtures.

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Section: Resultsmentioning

confidence: 99%

Driving Voltage in Reverse Mode Cell Using Reactive Mesogen : Effect of UV Absorption of Liquid Crystal

Yamaguchi

Sasaki

Inoue

2018

J. Photopol. Sci. Technol.

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“…Recently, we have proposed reverse mode LCs in which LC and RM mixture alignments are 90° twisted [16,17] and 270° super twisted [18]. In addition, the cell with a hybrid alignment nematic (HAN) has also been proposed [17,19,20]. The HAN cell shows an asymmetric optical property for the angle of the incident light.…”

Section: Introductionmentioning

confidence: 99%

“…The HAN cell shows an asymmetric optical property for the angle of the incident light. Such a cell can be applied to a smart window which can selectively scatter a midday sunlight [19].…”

Section: Introductionmentioning

confidence: 99%

Louver Function in Hybrid Aligned Reverse Mode Using Dual Frequency Liquid Crystal

Yamaguchi

Ushizaki

2019

J. Photopol. Sci. Technol.

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We have proposed reverse mode liquid crystal (LC) cells with a hybrid alignment nematic (HAN). A dual frequency LC which has positive and negative dielectric anisotropies and a reactive mesogen were used to prepare the cell. The reverse mode HAN cell has a transparent state at any incident angle in the voltage off state. The cell scattered a normal incident light by the voltage application and the transmittance, however, becomes high at a certain oblique incident angle like a louver of a window shutter. Such an incident angle can be switched by the frequency of applied voltage since the reoriented LC director changes from perpendicular to parallel to the substrate. Moreover, the incident angle switching was theoretically analyzed using conditions of refractive index matching and mismatching between the LC and the reactive mesogen.

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“…To remove frost or ice covering smart windows, high‐performance transparent and flexible thin‐film heaters (TFHs) should be attached on the outdoor windows of buildings and automobiles . In addition, electronically switchable windows (ESWs), to control the incident daylight and glare for occupant comfort, should be used . Therefore, to fabricate devices for multifunctional smart windows, the development of multifunctional transparent electrodes with low sheet resistance, high transmittance, hydrophobic surfaces, and outstanding flexibility and scalability for large‐area window coatings is very important.…”

Section: Introductionmentioning

confidence: 99%

Highly Transparent, Deformable, and Multifunctional AgPdCu/ITO/PTFE Hybrid Films for Self‐Cleaning, Flexible, and Energy‐Saving Smart Windows

Lee

Park

Kim

2018

Adv Materials Inter

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Rollable, bendable, twistable, and foldable polymer–oxide–metal multistacked hybrid films are demonstrated, which simultaneously act as multifunctional electrodes in flexible polymer‐dispersed liquid crystal (PDLC) windows and flexible and transparent thin‐film heaters (TFHs) for self‐cleanable and flexible smart windows. By continuous sputtering of a thin polytetrafluoroethylene (PTFE)–indium tin oxide (ITO)–AgPdCu (APC) multilayer on a colorless polyimide substrate, transparent and multifunctional films are fabricated with a low sheet resistance of 7 Ω □−1, high optical transmittance of 83% at a wavelength of 550 nm, low transmittance in the infrared region, and a high contact angle of 109°. Based on inner/outer bending, rolling, twisting, and folding tests, the outstanding flexibility of these PTFE/ITO/APC multistacked films is demonstrated. The flexible PDLC and flexible TFHs with PTFE/ITO/APC multistacked electrodes show a controllable transmittance range between the on and off states that is nearly 40%, and a high saturation temperature of 111 °C is observed at a low applied voltage of 4 V. The multifunctional properties of the flexible PDLC and TFHs fabricated on PTFE/ITO/APC hybrid films indicate that the polymer–oxide–metal hybrid film is a versatile transparent electrode that can be used for flexible, smart, and energy‐saving windows.

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Hybrid aligned nematic liquid crystal smart glass with asymmetrical daylight controls

Cited by 16 publications

References 27 publications

Driving Voltage in Reverse Mode Cell Using Reactive Mesogen : Effect of UV Absorption of Liquid Crystal

Driving Voltage in Reverse Mode Cell Using Reactive Mesogen : Effect of UV Absorption of Liquid Crystal

Louver Function in Hybrid Aligned Reverse Mode Using Dual Frequency Liquid Crystal

Highly Transparent, Deformable, and Multifunctional AgPdCu/ITO/PTFE Hybrid Films for Self‐Cleaning, Flexible, and Energy‐Saving Smart Windows

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