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掺杂γ-Fe₂O₃纳米颗粒的液晶显示器中图像残留问题的改善

Improvement of Image Sticking in Liquid Crystal Display Doped with γ-Fe₂O₃ Nanoparticles.

作者信息

Ye Wenjiang, Yuan Rui, Dai Yayu, Gao Lin, Pang Ze, Zhu Jiliang, Meng Xiangshen, He Zhenghong, Li Jian, Cai Minglei, Wang Xiaoyan, Xing Hongyu

机构信息

School of Sciences, Hebei University of Technology, Tianjin 300401, China.

School of Physical Science and Technology, Southwest University, Chongqing 400715, China.

出版信息

Nanomaterials (Basel). 2017 Dec 24;8(1):5. doi: 10.3390/nano8010005.

DOI:10.3390/nano8010005
PMID:29295553
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5791092/
Abstract

Image sticking in thin film transistor-liquid crystal displays (TFT-LCD) is related to the dielectric property of liquid crystal (LC) material. Low threshold value TFT LC materials have a weak stability and the free ions in them will be increased because of their own decomposition. In this study, the property of TFT LC material MAT-09-1284 doped with γ-Fe₂O₃ nanoparticles was investigated. The capacitances of parallel-aligned nematic LC cells and vertically aligned nematic LC cells with different doping concentrations were measured at different temperatures and frequencies. The dielectric constants perpendicular and parallel to long axis of the LC molecules ε and ε, as well as the dielectric anisotropy Δε, were obtained. The dynamic responses and the direct current threshold voltages in parallel-aligned nematic LC cells for different doping concentrations were also measured. Although the dielectric anisotropy Δε decreased gradually with increasing temperature and frequency at the certain frequency and temperature in LC state for each concentration, the doping concentration of γ-Fe₂O₃ nanoparticles less than or equal to 0.145 wt % should be selected for maintaining dynamic response and decreasing free ions. This study has some guiding significance for improving the image sticking in TFT-LCD.

摘要

薄膜晶体管液晶显示器（TFT-LCD）中的图像残留与液晶（LC）材料的介电性能有关。低阈值TFT LC材料稳定性较弱，其内部的自由离子会因自身分解而增加。在本研究中，对掺杂了γ-Fe₂O₃纳米颗粒的TFT LC材料MAT-09-1284的性能进行了研究。在不同温度和频率下测量了具有不同掺杂浓度的平行取向向列型液晶盒和垂直取向向列型液晶盒的电容。得到了垂直于和平行于液晶分子长轴的介电常数ε⊥和ε∥，以及介电各向异性Δε。还测量了不同掺杂浓度的平行取向向列型液晶盒中的动态响应和直流阈值电压。尽管在液晶态下，在特定频率和温度下，介电各向异性Δε随温度和频率的升高而逐渐降低，但为了保持动态响应并减少自由离子，应选择γ-Fe₂O₃纳米颗粒的掺杂浓度小于或等于0.145 wt%。本研究对改善TFT-LCD中的图像残留具有一定的指导意义。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7ce9/5791092/9eb191630636/nanomaterials-08-00005-g011.jpg
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