Orientation stabilization of light-controlling layers using liquid crystal polymers

IF 3.7 2区工程技术 Q1 COMPUTER SCIENCE, HARDWARE & ARCHITECTURE Displays Pub Date : 2024-11-21 DOI:10.1016/j.displa.2024.102893

Xinmin Yu , Tangwu Li , Jingxin Sang , Ming Xiao , Jianhua Shang , Jiatong Sun

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Abstract

Photo-alignment technology provides an advanced optical alignment method and high alignment quality compared to conventional rubbing techniques. However, challenges of photo-stability and response speed have hindered their practical application. This work is concerned with the stability of the photo-alignment layer, with azo dyes (SD1) employed as the photo-alignment layer material. Two solutions were investigated: the passivation of SD1 films with reactive mesogen (RM) material RM257 and the utilization of polymer–azo dye composites in lieu of the photo-alignment layer. Experimental methods, including spin-coating and UV polymerization, were employed, while optimal monomer concentrations were determined by photo-stability tests. The results demonstrate that the passivation layer enhances photo-stability. Atomic force microscopy (AFM) is employed to assess film roughness and enhance film quality. Furthermore, electro-optical tests indicate that the approach has no negative impact on the performance of LCD. These findings provide a more optimized approach to stabilizing liquid crystal (LC) alignment for advanced display technologies.

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利用液晶聚合物稳定光控层的方向

与传统的摩擦技术相比，光对准技术提供了一种先进的光学对准方法和较高的对准质量。然而，光稳定性和响应速度方面的挑战阻碍了其实际应用。这项研究关注光对准层的稳定性，采用偶氮染料（SD1）作为光对准层材料。研究了两种解决方案：用反应介质（RM）材料 RM257 对 SD1 薄膜进行钝化，以及用聚合物-偶氮染料复合材料代替光对准层。实验采用了旋涂和紫外聚合等方法，并通过光稳定性测试确定了最佳单体浓度。结果表明，钝化层可增强光稳定性。原子力显微镜（AFM）被用来评估薄膜粗糙度和提高薄膜质量。此外，电光测试表明，这种方法对液晶显示器的性能没有负面影响。这些发现为稳定先进显示技术的液晶（LC）排列提供了一种更优化的方法。

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来源期刊

Displays 工程技术-工程：电子与电气

CiteScore

4.60

自引率

25.60%

发文量

138

审稿时长

92 days

期刊介绍： Displays is the international journal covering the research and development of display technology, its effective presentation and perception of information, and applications and systems including display-human interface. Technical papers on practical developments in Displays technology provide an effective channel to promote greater understanding and cross-fertilization across the diverse disciplines of the Displays community. Original research papers solving ergonomics issues at the display-human interface advance effective presentation of information. Tutorial papers covering fundamentals intended for display technologies and human factor engineers new to the field will also occasionally featured.