彩色高分子分散液晶薄膜之研究

Study on the Colour Polymer-Dispersed Liquid Crystal Display Films

蘇稚琳(Chih-Lin Su)

指導教授 ： 許千樹

國立交通大學/理學院/理學院碩士在職專班應用科技學程/碩士(2010年)

https://doi.org/10.6842/NCTU.2010.00072

摘要

高分子分散型液晶(Polymer-Dispersed Liquid Crystal , PDLC)為近幾年所發展出的光電顯示元件，相對於傳統液晶顯示器，PDLC有著不需偏光片、不需配向、製作容易及可使用於軟性基板上的優點，可以應用在光開關、投影顯示及電子書…等。 PDLC的光電特性中，反應時間、驅動電壓、對比度等，會直接影響其應用上的表現，本論文採取雜二色性染料來進行對比度的提升。使用的條件：液晶(E7)及高分子(PVA)混合比為35:65，以0.5%~1.5%微量雜二色性染料，使用均質機將上述材料混合均勻，並以自動塗佈機分別製作樣本。完成樣本後，使用光偵測量測系統測量光電特性，並以偏光顯微鏡觀察樣本。 實驗發現，與未雜的樣本相比較下，M-483(藍色)二色性染料雜濃度1%的樣本表現最佳，其對比度提升了11%，有明顯的改善。在觀察樣本後發現，雜奈米微粒(Ludox) 液晶滴形狀及分佈比較均勻，提供PDLC薄膜初期達到良好之霧化效果，以阻絕光線。

關鍵字

高分子分散液晶 ； 二色性染料 ； 液晶滴

並列摘要

In this study , we developed a PDLC cell as a electrical switchable optical device . Comparing with conventional LC displays, PDLCs need no polarizer , alignment , can be applied in flexible display and are easier for production . PDLC cells can be used for include light shutters, projecting displays, and e-books applications .

Of a PDLC display , it’s important to improve it’s electro-optical properties Such as response time , driving voltage , and the contrast ratio . All these parameters play important roles in improving the performance of the PDLCs.

A guest-host (GH) LC was prepared by mixing E7 and selectively dichroic dye together . GHLC was mixed with PVA with certain ratio and followed by homogenizing to from the emulsions . The emulsions were coated , fabricated as switchable devices under different conditions . The electro-optical properties of the obtained PDLC cells were investigated .

In this study , an optimized LC composition was made to enhance the contrast ratio. With the nano-particle assistance, the PDLC film can offer very good light scattering performance by increasing the LC droplet size uniformity.

並列關鍵字

polymer dispersed liquid crystal ； dichroic dye ； liquid crystal droplets

參考文獻

[1] E. Lueder, Liquid Crystal Displays: Addressing Schemes and Electro-Optical Effects, New York: Wiley, 2001.

[2] G. P. Wiederrecht, Annu. Rev. Mater. Res. 31, 139, 2001.

[3] Y. P. Huang, T. Y. Tsai, W. Lee, W. K. Chin, Y. M. Chang and H.

Appl. Phys. Lett., 82, 16, 2610, 2003.

[5] Y. H. Lin, H. Ren, Y. H. Wu, Y. Z., J. Fang, Z. Ge, and S. T. Wu,