are self-assembled in a thermodynamically spontaneous way when chirality is about several hundreds of nanometers. LC directors are doubly twisted at this high chirality and self-assembled into a double-twisted cylinder (DTC). The way that the DTCs are stacked determines the symmetry of the BPLC structure, and the lattice length scale in common includes the visible wavelength, which appears as colorful micrographic textures. From an application perspective, a remarkable breakthrough is that polymer-stabilization method is able to extend their narrow temperature range. [6] Dispersion of nanoparticles (organic/inorganic colloids and perovskite quantum dots) or bent-core LCs and 3D confinement of BPLC like microencapsulation is also reported that it can extend the temperature range of BPs. [7][8][9][10] The polymer-stabilized BPLC (PS-BPLC) by in situ photopolymerization is a promising method not only for extending the BP temperature range but also for enhancing their electro-optic performance, such as optical isotropy, [11] selective reflection, [12] less hysteresis, [13] and fast response time. [14] Despite a successful prototyping into a PS-BPLC display, [4] the PS-BPLC has rather shown their possibility of applying to versatile photonic applications such as a diffraction grating, [15] vortex beam ] have been reported by using BPLC materials because these are advantageous for the non-mechanical beam steering. Such results support that BPLC is one of the promising materials to create such novel functional devices. However, the performance of the device is deteriorated by the multidomain structure of BPLCs. For example, the diffraction efficiency decreases significantly. Despite such importance, less attention has been paid to create and study about monodomain BPLCs for diffraction gratings among several studies previously reported. [16,[25][26][27] Some approaches report that, to resolve the unwanted multiple colors from polycrystalline lattice structure, one can adjust the chiral pitch of BPLCs and have the Bragg wavelength shifted far away from the wavelength of device operation. For instance, when the desired wavelength is within the visible region, one can control the chiral pitch to position the Bragg wavelength within UV region. However, this approach is limited to an The structural beauty of liquid crystalline blue phases is attested not only by their colorful optical micrographic textures but also by optical isotropy. More importantly, the homogeneity of the structures influences greatly to the electro-optic properties. In this work, how the lattice orientation in polymerstabilized blue phase liquid crystal (PS-BPLC) diffraction grating affects phase-modulated diffraction efficiency is elaborated. A well-arranged monodomain structure of blue phase is achieved and its diffraction capability is compared with multidomain PS-BPLC. The diffraction efficiency in the zeroth order of monodomain PS-BPLC is improved by 9% compared to that of multidomain structure. In addition, both driving and threshold voltages in m...

Wide application of dichroic dye-doped liquid crystal device (DLCD) devices has been proposed, which removes conventional film-type polarizer in reflective LCD and OLED. Combination of DLCD, quarter-wave film and reflector can realize effective reflective LCD. In addition, by replacing conventional polarizer to switchable DLCD in OLED, the proper level of a low reflection is achieved, and more interestingly high brightness OLED can be realized if the optic axis of DLC is switched to vertical alignment when there is no ambient light, which could save power consumption and life time of OLED. Further DLCD can be applied to bi-functional device functioning as both smart mirror and light shutter.

Owing to anisotropic light emission, an aligned quantum-rods (QRs) array paired with LCD backlight offers a viable option to achieve the light polarization and enhance the color gamut. Herein, we present a facile approach for the fabrication of a functional film with unidirectional ordered QRs by utilizing solvent-based UV-curable reactive-mesogen and an in-plane electric field. The film exhibits partially polarized light with polarization ratio value of 0.42, which was mainly attributed to the QRs alignment in the electrode gap area of IPS substrate. Author KeywordsReactive-mesogen; quantum-rods; polarization ratio P-116 / S. Kaur SID 2018 DIGEST • 1649 P-116 / S. Kaur