Effect of different polyimide solution viscosity on pretilt angle of liquid crystal

Jin-gui LIU; Yin XIAO; Ying-chun SUN

doi:10.3788/YJYXS20163111.1038

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Effect of different polyimide solution viscosity on pretilt angle of liquid crystal

Material and Devic | 更新时间：2020-08-12

- Effect of different polyimide solution viscosity on pretilt angle of liquid crystal
- Chinese Journal of Liquid Crystals and Displays Vol. 31, Issue 11, Pages: 1038-1045(2016)
- 作者机构：
  
  重庆京东方光电科技有限公司Cell PI科, 重庆 400700
- 作者简介：
- 基金信息：
- DOI：10.3788/YJYXS20163111.1038
  CLC：
- Received：24 June 2016，
  
  Accepted：11 August 2016，
  
  Published：2016-11
- 稿件说明：
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Jin-gui LIU, Yin XIAO, Ying-chun SUN. Effect of different polyimide solution viscosity on pretilt angle of liquid crystal[J]. Chinese journal of liquid crystals and displays, 2016, 31(11): 1038-1045.
DOI：

Jin-gui LIU, Yin XIAO, Ying-chun SUN. Effect of different polyimide solution viscosity on pretilt angle of liquid crystal[J]. Chinese journal of liquid crystals and displays, 2016, 31(11): 1038-1045. DOI： 10.3788/YJYXS20163111.1038.

摘要

为了制备具有自取向功能的聚酰亚胺（PI）取向膜，避免摩擦工序在取向膜表面造成静电、灰尘、配向不良等不利影响，本实验通过一系列黏度不同且有水平及垂直取向功能的PI溶液，研究了PI液黏度和其取向膜表面粗糙度的关系，进而研究了PI膜表面粗糙度和液晶预倾角（

）的关系。研究发现：取向膜表面粗糙度随着PI液黏度的增大而增大，

随着粗糙度的增大而增大，但当粗糙度大于一定值（3.760 nm）后，

增长缓慢并趋于稳定。这主要是因为PI液黏度增大时，阻碍了相邻PI液滴通过分子链段协同运动向彼此扩散的几率，进而形成取向膜表面的“峰谷”形貌，这种“峰谷”形貌表面对液晶垂直取向起到了支撑作用，正是这种支撑作用使得液晶分子获得较大的

。结合液晶面板响应时间对高预倾角的要求和Inkjet PI液滴喷嘴过小对PI液黏度的限制，得出PI液黏度大约为41CP时，此时取向膜表面粗糙度为4.830 nm，液晶取向角为5.5°，能较好地满足液晶取向的要求。

Abstract

To prepare a kind of polyimide (PI) solution with self-alignment function

and avoid producing disadvantage effect (static electricity

particle

alignment error

etc.) on alignment layer with rubbing process

a series of polyimides with different solution viscosity were used to research the relationship between PI solution viscosity and its surface roughness. Meanwhile

the relationship between the surface roughness of PI alignment layer and pretilt angle(

) of liquid crystal was also studied. The results demonstrated that surface roughness of PI alignment layer increased with PI solution viscosity increasing

and also the

increased with the surface roughness increasing

but when the surface roughness exceeded a certain value of 3.760 nm

began to increase slowly. It was mainly because that the high PI solution viscosity hindered the synergic motion of PI chain segment to diffuse to each other

thus forming the rough surface topography. This kind of "peak-valley" topography played a supporting role to the vertical alignment of liquid crystal and then resulted in the high

. A high

was generated by high PI solution viscosity to reduce response time

but the micron-grade Inkjet head nozzle would be blocked by high PI solution viscosity. We found that when the viscosity of PI solution was 41CP

its surface roughness of alignment layer was 4.830 nm

and the

reached to 5.5°

which can satisfy the two requirements mentioned above well.

关键词

Keywords

references

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