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Brightness Enhancement of Fluorescent Liquid Crystal Display

荧光液晶显示器的亮度增强

基本信息

批准号：
12650335
负责人：
YAMAGUSHI Rumiko
金额：
$ 1.66万
依托单位：
AKITA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650335/
关键词：
Nematic Liquid Crystal Guest-Host Effect fluorescent dve dichroic ratio Liquid Crystal Display

项目摘要

Emissive LCDs in which a dichroic phosphor is dissolved as a guest material have been reported and a multicolor display has been demonstrated by combining functions of the UV shutter and of the emitter in the fluorescent LC cell. Moreover, a brightness was enhanced by the use of the polarization property of the fluorescence emitting from the LC cell.(1) 14 fluorescent dyes and 9 nematic liquid crystals were prepared, and absorption and emission spectra were measured in their combinations (14×9), In this study, a dichroic phosphor was firstly dissolved in a liquid crystal with negative dielectric anisotropy (n-type) and the dichroic ratio was investigated.(2) The fluorescent homogeneous LC cell, fluorescent 90℃ twisted nematic (TN) LC cell and the polarizer were stacked. When the voltage was applied to the TN cell, the fluorescent color can be switched from homogeneous cell to TN cell. The brightness increases more than two times due to using the conventional polarizer for the visible light, compared to the former fluorescent LCD mode. Moreover, a novel fluorescent LCD mode in which n-type homeotropic GH LC layer and p-type (positive dielectric anisotropy) homogeneous GH LC layer are stacked was proposed. The fluorescent color switching is successfully demonstrated and the brightness was about 1.5 times higher than that of the former display mode using only p-type fluorescent LCs.(3) Light-emitting type LCDs in which LED and EL devices were used as a back light and a excitation lightsource. Dichroic phosphors were dissolved in a nematic LC and the guest-host type LC cells are made. The emission color change from fluorescence to the back light was successfully demonstrated.(4) A novel LCD consisting of the emissive reflector and the TN LC layer containing a dichroic fluorescent dye was proposed. In the emission mode, the fluorescent color was changed from the LC one to the reflector's. In the reflection mode, the "black on colored light" type display can demonstrated.

已经报道了将二向色性荧光粉作为客体材料溶解的发光LCD，并通过结合UV快门和荧光液晶盒中发射体的功能展示了多色显示。(1)制备了14种荧光染料和9种向列型液晶，测量了它们的吸收光谱和发射光谱(14×9)，首次将二色性荧光粉溶解在具有负介电各向异性(n型)的液晶中，并研究了它们的二色性比。(2)将均匀荧光液晶盒、90℃扭曲向列相(TN)液晶盒和偏振器叠加在一起。当向TN电池施加电压时，荧光颜色可以从均匀的电池切换到TN电池。与以前的荧光LCD模式相比，由于对可见光使用传统的偏振器，亮度增加了两倍以上。此外，还提出了n型同向异性GaH液晶层和p型(正介电各向异性)均匀GaH液晶层叠加的新型荧光液晶显示模式。成功地实现了荧光颜色切换，亮度比仅使用p型荧光LCD的显示模式提高了约1.5倍。(3)以LED和EL器件为背光源和激发光源的发光型LCD。将二向色性荧光粉溶解在向列型液晶盒中，制成客主型液晶盒。成功地演示了从荧光到背光的发光颜色变化。(4)提出了一种新型LCD，它由发射反射镜和含有二色性荧光染料的TN液晶层组成。在发射模式下，荧光颜色由液晶转换为反射镜的颜色。在反射模式下，可以显示“黑灯上的彩色”类型的显示器。