( lf( ecnattiecnatcemsnarT).( lf( ecnattia( ecnanmuLecnatcemsnarT%))%50 %))%50u.i0eReR(a)(a)(b)(b)Technical Awards：The 28th International Display Workshops(IDW) Best Paper Award (2021) - Optically Switchable Transparent Liquid Crystal Display Table 1 HTP of chiral materialsTable 2 Material composition (wt.%)4. Results and discussionFig.4 Optical properties of PNLC samples. (a) Total transmittance spectra in the transparent state before UV irradiation, and (b) total reflectance spectra in the screen state after UV irradiation.To investigate the optical properties of the PNLC, its total transmittance spectra in the transparent state and total reflectance spectra in the screen state were measured using a spectrometer with an integrating sphere (U-4000, Hitachi, Ltd). Each haze was measured using a haze meter (HM-65 W, Murakami Color Research Laboratory).Fig. 4(a) demonstrates the total transmittance of the PNLC samples in the transparent state. Transmittance spectra were as high as approximately 80% over a wide visible range. In the region less than 500 nm, the transmittance decreased due to the absorption of the azobenzene itself. Fig. 4(b) depicts the total reflectance of the PNLC samples in the screen state after sufficient UV irradiation at 20 mW/cm2 for 60 s at room temperature. The PNLC samples were sufficiently screened using this UV energy until the optical properties stopped fluctuating. The reflectance of No.1 sample with Azo-A was higher than that of No. 2 sample with Azo-B. The optical properties in terms of haze values are summarized in Table 3. From Table 2, it is evident that the ΔHTP of azobenzene influenced the reflectance and haze of the PNLC in the screen state. As ΔHTP increased, the orientation of the LC was disturbed more significantly, resulting in greater reflectance and haze in the screen state. Fig. 5 depicts the dependence of luminance on the viewing angle. In the screen state of sample No.1 after UV irradiation, a white image was projected using the Vis projector (MW612, BenQ Corporation) under the 透過率、拡散反射率illuminance of 3350 lx, and we measured the luminance excluding the background light using a luminance meter 輝度の角度依存性(LS-110, Minolta Co., Ltd) for different viewing angles. The light scattering effect indicated that images could be seen at a viewing angle of 60°.反射率は、UV強度と時間。The photographs in Fig. 6 present sample No. 1 in each state. The sample was 10 × 10 cm in size. In the ★最終版には、透明時の透過率角度依存transparent state, it was as transparent as the glass. Hazeの表を文中に追加Following UV irradiation, a screen appeared in the irradiated area. After turning off the UV LED, we could ★樹脂なしの比較もあると面白い。see the images projected from the front projector. When the projection was stopped and blue light irradiation was applied, the sample reverted to the transparent state.1009080706050403020100350400450500550600650700750Wavelength (nm)100Empty glass cells (EHC. Co., Ltd) with a cell gap of 10 μm were prepared by assembling two ITO glass 90substrates treated with vertically aligned PI layers. Each 80LC mixture was injected into the empty glass cells using 70the capillary force on a hot plate at 100°C, which is equal 60to the LC clearing point. The cells were cured by exposure 反射率は、UV強度と時間。to blue light from an LED (λmax = 450 nm), under 50 50V–50 Hz at room temperature, to align the LC orientation. ★最終版には、透明時の透過率角度依存性も追加40The power of the blue light was 7 mW/cm2. After 10 min Hazeの表を文中に追加30of curing, the optically switchable reverse-mode PNLC 20was prepared in the transparent state without the ★樹脂なしの比較もあると面白い。application of voltage. 100No.1, Azo-ANo.2, Azo-B350400450500550600650700750Wavelength (nm)3025201510350400450500550600650700750Wavelength (nm)3025201510No.1, Azo-ANo.2, Azo-BNo.1, Azo-ANo.2, Azo-B35040045200180160140120100806040200101透過率、拡散反射率輝度の角度依存性標識の
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