Abstract
We developed two kinds of bistable smectic-A liquid crystal mixtures. Compared with traditional cyanobiphenyl and cyanoterphenyl derivatives, several changes have been made in molecular design: Isothiocyanato is used as a substitute for cyano to increase the optical anisotropy; fluoro groups are added on 3 and 5 positions of the isothiocyanato substituent terminal phenyl ring to increase both the dielectric anisotropy and eutectic property of the smectic mixture; derivatives of (4-isothiocyanatophenyl) pyridine are introduced to produce a wide smectic range. Thanks to above designs, the final smectic-A mixtures exhibit highly improved properties, such as higher contrast, lower operation voltages and wider temperature range. Based on the developed liquid crystals, electronic tags were also demonstrated, which exhibit reliable performance. This work reveals new insights for tailing liquid crystal molecules with bistability, which is extremely meaningful for the design and fabrication of green display devices.
Highlights
Bistable liquid crystal display (BLCD) has attracted intensive attentions thanks to the feature of power required only in updating images while electrical field unneeded in maintaining off/on states [1,2,3,4,5,6,7]
We developed two kinds of bistable smectic-A liquid crystal mixtures
This work reveals new insights for tailing liquid crystal molecules with bistability, which is extremely meaningful for the design and fabrication of green display devices
Summary
Bistable liquid crystal display (BLCD) has attracted intensive attentions thanks to the feature of power required only in updating images while electrical field unneeded in maintaining off/on states [1,2,3,4,5,6,7]. The cell configuration of latter strategy is drastically simplified, supplies a light weight, low cost, environment friendly and even flexible way for reliable BLCDs. Among above approaches, ion-doped smectic-A (SmA) bistable display is especially attractive thanks to its high and uniform transmittance, wavelength insensitivity, no requirement of alignment layers, simple and easy fabrication. Few works have been reported on bistable SmA LCs, while most of them are organosiloxane based materials [12, 13] They exhibits good stability and reliable performance. We developed two bistable SmA LCs via fusing isothiocyanato-biphenyl, isothiocyanato-terphenyl and (4-isothiocyanatophenyl) pyridine derivatives Their measured electro-optical properties revealed superiorities of lower operation voltages, higher contrast ratio, wider temperature range over traditional bistable SmA LCs. The electronic tags filled with the new SmA LC exhibit improved electro-optical properties and reliabilities. This work reveals new insights for the design of bistable SmA LCs, which is quite significant for the design and fabrication of the both energy and material efficient displays
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