Multiple-Color Reflectors Using Bichiral Liquid Crystal Polymer Films and Their Applications in Liquid Crystal Displays

Polymers

卷:12

Ming-Hsien Li¹  Ko-Ting Cheng²  Cheng-Kai Liu²  Chi-Lun Ting³  AndyYing-Guey Fuh³ 

[1] Department of Applied Materials and Optoelectronic Engineering, National Chi Nan University, Nantou County 545, Taiwan;

[2] Department of Optics and Photonics, National Central University, Taoyuan 320, Taiwan;

[3] Department of Photonics, National Cheng Kung University, Tainan 701, Taiwan;

关键词: cholesteric liquid crystals;    multiple-color reflectors;    chiral polymers;    liquid crystal polymers;    color gamut;    light-utilization efficiency;   

DOI  :  10.3390/polym12123031

来源: DOAJ

【 摘 要 】

Multiple-color reflectors using bichiral liquid crystal polymer films (BLCPFs) are investigated. The BLCPFs consist of alternate layers of two different single-pitch cholesteric liquid crystal (CLC) layers, named CLC#A and CLC#B. The thickness of each CLC layer equals its single pitch length. The optical properties in terms of reflections, reflection-wavelength ranges, and distributions of reflection spectra of the BLCPFs that result from the fixed pitch length of CLC#A along with the decrease of the pitch length of CLC#B are qualitatively simulated and investigated. The results indicate that the above optical properties of the BLCPFs depend on the LC birefringence and pitch lengths of CLC#A and CLC#B layers. The concept of fabrication method of the BLCPFs by using polymerizable CLCs and thin films of poly(vinylalcohol) or photoalignment materials is discussed. They have potential practical applications in functional color filters, asymmetrical transmission systems, etc., owing to the multiple reflection bands of BLCPFs. Moreover, the BLCPFs, which can enhance the color gamut and light-utilization efficiency of light sources/LC displays, are reported herein.

【 授权许可】

Unknown