(S)-BN : 2.9 wt%(S)-BN : 2.9 wt%Sb-826010: 83.75 wt%Sb-826010: 83.75 wt%OCO4 : 5.1 wt%Fig. 3 presents the materials used in this experiment. Chiral azobenzene (Azo-A and Azo-B) and a non-photochromic chiral compound (Chiral) were synthesized, and their HTPs are presented in Table 1. The ΔHTP of Azo-A with axial chirality of binaphthyl moiety[9] is stronger than that of Azo-B with point chirality. We prepared two LC mixtures using Azo-A and Azo-B to investigate the effects of their ΔHTP. Table 2 lists the composition of each material. In this study, we used a positive nematic LC, Sb-826010 (Shanben. Co., Ltd), which has birefringence of Δn = 0.26 . RM, 4,4'-bis(6-(acryloyloxy)-hexyloxy)biphenyl Chemical Industry Co., Ltd.), and photo-initiator, Iragcure819 (Ciba Specialty Chemicals Inc.). Compensated and Sb-826010: transparent samples were prepared by mixing the chiral 83.75 wt%azobenzene and Chiral, according to the measured HTP 光応答性キラル光非応答性キラルSb-826010: values listed in Table 1. (R)-BN : 1.8 wt%Azo13m : 6.2 wt%83.75 wt%BAB6 : 7.5 wt%BAB6 : 7.5 wt%Sb-826010ne 1.79, n0.26/PIragcure8Iragcure8Technical Awards：The 28th International Display Workshops(IDW) Best Paper Award (2021) - Optically Switchable Transparent Liquid Crystal Display Fig.1 System layout of optically switchable transparent LCDFig.2 Schematic diagram of optically switchable reverse-mode PNLC in (a) transparent state and (b) screen stateFig.3 Material structures3. ExperimentalR=C4H9液晶PNLC sampleVisprojectorBlueLED(450nm)液晶光応答性キラル光非応答性キラAzo13m : 6.2 wt%(R)-BN : 1.8 wt%樹脂OCO4 : 5.1 wt%重合a UV LED, and a blue LED. Typically, a PNLC is transparent; upon irradiation with UV light, its irradiated area converts from the transparent state to the screen state. The Vis projector stops the UV irradiation and projects images on the screen area in front of the viewer. Subsequently, blue light irradiation reverts the PNLC to its initial transparent state.2.2 Structure of optically switchable reverse-mode PNLCThe optically switchable reverse-mode PNLC is a composite of an LC, polymer network, chiral azobenzene, and non-photochromic chiral compounds. The polymer network consists of reactive mesogen (RM) monomers. It is phase-separated from the LC and has a strong aligning effect on the LC. When the HTP of chiral azobenzene in the trans state without UV irradiation is equal to that of the non-photochromic chiral compound having opposite chirality, the LC is in a compensated and transparent nematic phase. The PNLC composite was sandwiched between two glass substrates covered with ITO and a vertically aligned PI layer. Before the application of UV light, the LC and polymer network are aligned vertically, resulting in the transparent state, as shown in Fig. 2(a).Upon UV irradiation, the chiral azobenzene transforms from the trans state to cis state by photoisomerization, thus disrupting the balance of the chirality and generating a twisting power in the LC. Consequently, the orientation of the LC is disordered, and it becomes a light-scattering screen, as shown in Fig. 2(b).(Tokyo ScreenUV LED (365nm)100重合波長450 nm 重合光強度30 mW/cm重Azo-AR=C4H9Azo-BAzo-AAzo-BChiral(a)(b)Lig
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