Research and Developments of Multi-Color Fluorescent Display Devices by Using Light Emitting Diode and Liquid Crystals

1.通过将某些荧光染料溶解到胆甾型和向列型液晶的混合物中，制备了不同液晶层厚度和不同染料浓度的液晶盒。然后，测量了紫外光(UV)激发的荧光强度，并研究了这些细胞的复合特性。制备了在衬底内表面形成荧光层的LC荧光器件，测量了其荧光特性和荧光光谱随外加电压的变化关系。在蓝光或紫外光LED和1W荧光灯的刺激下，测量了掺入荧光染料的液晶盒和液晶盒中的荧光强度和荧光光谱的外加电压关系。然后，研究了光幕效应和电控荧光强度的一些特性。通过在掺有荧光染料的液晶盒中复合UV-LED和UV-荧光灯，测量了液晶盒的荧光强度与荧光光谱和施加电压的关系。然后，制备了可将荧光颜色从蓝色变为红色或绿色的荧光器件，并将其作为多色荧光LC显示器件进行了研究。此外，它们的荧光产率也得到了提高。具有彩色特性的荧光显示器件是由多个掺杂不同荧光染料的液晶盒堆叠而成的。然后，测量了它们的荧光性质，并讨论了在GTE色坐标上施加电压与荧光性质的关系。获得了最佳变色条件，可以合成性能优良的荧光液晶盒。对研究结果进行了检验，并对研究工作进行了总结。

1. Liquid crystal (LC) cells with various thicknesses of LC layers and dye concentrations are prepared by dissolving some fluorescent dyes into mixtures of cholesteric and nematic LCs. Then, fluorescent intensities stimulated by ultraviolet (UV) light are measured and characteristics in complex properties of these cells are studied.2. LC fluorescent devices of which fluorescent layers are formed on the inside surface of the substrates are prepared, and their dependences of fluorescent properties and fluorescent spectra on the applied voltage are measured.3. External voltage dependences of fluorescent intensities and fluorescent spectra in both of the LC cells doped with fluorescent dyes and LC fluorescent devices are measured under the stimulation by the blue or UV-LED and the 1W-fluorescent lamp. Then, light shuttering effects and some properties of electrically controlled fluorescent intensities are studied.4. Relations between fluorescent intensities and fluorescent spectra and applying voltages to the LC cells are measured by composing the UV-LED and UV-fluorescent lamp to the LC cells doped with the fluorescent dyes. Then, fluorescent devices of which fluorescent color can be changed from blue to red or to green are prepared and studied as multi-color fluorescent LC display devices. In addition, their fluorescent yields are improved.5. Fluorescent display devices having colorful properties are composed by stacking several LC cells doped with different fluorescent dyes. Then, their fluorescent properties are measured and relations between applied voltages and fluorescent properties on GTE color coordinates are discussed. Optimum conditions for color changes are obtained, and fluorescent LC cells with excellent properties can be composed.6. The results are examined and the research work is summarized.