本論文探討將黑色二色性染料(S428)摻雜於正型向列型液晶(E7)中，利用混成配向(Hybrid Alignment, HB)結構製作具有可電控防窺功能之液晶元件。本研究主要分為三個部分，第一部分探討向列型液晶摻雜二色性染料之混成結構在不同入射光偏振方向下與不同入射面的光學差異，並分析視角軸向變化對於穿透率之影響，找出符合基礎理想在未施加電壓時，於裝置正向視角提供清晰畫面，側向觀看時阻擋顯示光線，且具有最佳窄視角特性之配置，利用1D-DIMOS軟體模擬不同配置下，視角-90°至90°的連續穿透度變化，以找出最佳窄視角之設計組合。第二部分為探討二色性染料摻雜於正型向列型液晶之HB結構中之穿透度與染料濃度及液晶盒厚度之關係，分別將不同濃度(1 wt%、1.5 wt%、2 wt%與2.5 wt%)之黑色二色性染料摻雜於正型向列型液晶中，並注入不同厚度(30 μm與40 μm)之液晶盒中，並在固定視角0°、30°、45°與60°下，根據其電壓-穿透曲線探討染料摻雜濃度與液晶層厚度對穿透度變化之影響，並初步觀察可電控之視角角度。第三部分為實際拍攝與探討2.5 wt%二色性染料S428摻雜於正型向列型液晶(E7)之HB結構防窺效果，分別將液晶盒厚度為30 μm與40 μm於固定視角0°、30°、45°與60°下進行拍攝，並將其與第二部分之實驗與模擬數據結果進行對比，評估可電控視角範圍，最後分別量測出厚度為30 μm與40 μm在0至30 Vpp電壓範圍內之電控視角範圍，並透過電壓-穿透曲線以及實際拍攝進一步驗證電控範圍與效果。;This thesis investigates the fabrication of electrically controllable liquid crystal (LC) devices with privacy protection functions by black dichroic dye (S428) doped-positive nematic LCs (E7), utilizing hybrid alignment (HB) structures. The research in this thesis is divided into three main parts. The first part explores the optical differences of dye-doped hybrid aligned nematic LCs under varying incident light polarization directions and different alignment surfaces. It also analyzes the influences of viewing axis variation on transmittance, aiming to identify configurations that meet the fundamental requirement of providing a clear image without any applied voltage in the normal viewing direction while effectively blocking display light at oblique angles. Using the 1D-DIMOS simulation software, the angular transmittance profiles from –90° to +90° under different configurations are analyzed to determine the optimal design for a narrow viewing angle. The second part investigates the relationship between the transmittance of the HB structure and both the dye concentration and LC cell thickness. Various concentrations of black dichroic dye S428 (1 wt%, 1.5 wt%, 2 wt%, and 2.5 wt%) were mixed with E7 and injected into LC cells having two different thicknesses (30 μm and 40 μm). Voltage–transmittance curves were measured at fixed viewing angles (0°, 30°, 45°, and 60°) to evaluate the influence of dye concentration and LC layer thickness on transmittance behavior, and to preliminarily observe the electrically controllable viewing angle range. The third part involves actual photographic evaluation of the privacy performance of HB structures doped with S428(2.5wt%). Samples with thicknesses of 30 μm and 40 μm were photographed under fixed viewing angles (0°, 30°, 45°, and 60°). The photographic results were compared with simulation and experimental data from the second part to assess the controllable viewing range. Finally, the electrically tunable viewing angle range for both 30 μm and 40 μm LC cells under applied voltages from 0 to 30 Vpp was determined and verified through both voltage–transmittance curves and photographic evidence.
