首页   按字顺浏览 期刊浏览 卷期浏览 Ferroelectric liquid crystal gels Network stabilized ferroelectric display
Ferroelectric liquid crystal gels Network stabilized ferroelectric display

 

作者: R.A. M. Hikmet,   H.M. J. Boots,   M. Michielsen,  

 

期刊: Liquid Crystals  (Taylor Available online 1995)
卷期: Volume 19, issue 1  

页码: 65-76

 

ISSN:0267-8292

 

年代: 1995

 

DOI:10.1080/02678299508036721

 

出版商: Taylor & Francis Group

 

数据来源: Taylor

 

摘要:

Liquid crystal (LC) mixtures of a reactive diacrylate and a commercial ferroelectric liquid crystal (FLC) mixture were produced. The mixtures were brought into cells provided with orientation layers in which various orientations such as uniaxial and twisted orientations, could be induced. When the desired orientation had been obtained, the polymerization of the reactive molecules was induced creating a three-dimensional anisotropic network containing the FLC molecules which were not chemically attached to the network (ferroelectric gels). The presence of the anisotropic network was found to have a large effect on various properties of the FLC molecules. For example, complex orientations (for example, 180° twisted) obtained by polymerization (formation of the gel) in the nematic phase remained unchanged when the gel was cooled to the FLC phase. Likewise uniaxial orientation, which cannot be realised in thick cells containing the pure FLC, could be realised when ferroelectric gels were used. For this reason the ferroelectric gels will be referred to as ananisotropic network-stabilized FLC.Optical properties such as effective birefringence and tilt angle were also influenced by the network. When use was made of a network with a lower birefringence than the FLC, a reduced effective birefringence in gels was observed. This is important for technologies involving thicker cells. The switching covered a range of voltages in the case of the gels, instead of showing a well-defined threshold voltage as in the bulk. The possibility of using this effect to obtain grey scales in cells during passive addressing has also been demonstrated.

 

点击下载:  PDF (1433KB)



返 回