Generation of Pretilt Angle of Liquid Crystals Aligned on Organic-Solvent-Soluble Polyimide Alignment Films for Active-Matrix TN-LCDs and its Mechanism Caused by the Micro-Surface Structure of Surfaces
作者:
M. Nishikawa,
T. Miyamoto,
S. Kawamura,
N. Bessho,
Y. Iimura,
S. Kobayashi,
期刊:
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals
(Taylor Available online 1995)
卷期:
Volume 259,
issue 1
页码: 93-100
ISSN:1058-725X
年代: 1995
DOI:10.1080/10587259508038675
出版商: Taylor & Francis Group
关键词: organic-solvent-soluble polyimide;alignment film;nematic liquid crystal;pretilt angle;surface energy;micro-surface structure
数据来源: Taylor
摘要:
The increasing of pretilt angles of liquid crystals (LCs) in active-matrix twisted nematic liquid crystal displays (AM-TN-LCDs) is one of the most important subjects to achieve high contrast and defect-free AM-TN-LCDs. We have developed the new generation method of the pretilt angle by using newly synthesized organic-solvent-soluble polyimides (PIs) containing two types of diamine. These PIs are useful in the production process of AM-TN-LCDs due to their low temperature process, say 180°C. The maximum pretilt angle of 2.8° for an NLC, ZLI-1565, is obtained using the PI containing two types of diamine with a mole fraction of 50/50. This phenomenon can be explained on the basis of the micro-topography of the PI surfaces and, in particular, the obtained pretilt angles may be attributed to the relative bulkiness of diamines used in the PIs.
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