Quality improvement of inkjet coating alignment film

Ping WANG; Hui NIE; Huan LI; Hai-bin HAN; Jin HU; Tao MA; Qiang-qiang WANG; Tao XU; Xiang XU; Peng WANG

doi:10.3788/YJYXS20203504.0341

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Quality improvement of inkjet coating alignment film

Materials and Devices | 更新时间：2020-07-05

- Quality improvement of inkjet coating alignment film
- Chinese Journal of Liquid Crystals and Displays Vol. 35, Issue 4, Pages: 341-349(2020)
- 作者机构：
  
  合肥京东方显示技术有限公司, 安徽合肥 230011
- 作者简介：
- 基金信息：
- DOI：10.3788/YJYXS20203504.0341
  CLC： TN141.9
- Received：10 October 2019，
  
  Revised：09 November 2019，
  
  Accepted：09 November 2019，
  
  Published：05 April 2020
- 稿件说明：
移动端阅览
Ping WANG, Hui NIE, Huan LI, et al. Quality improvement of inkjet coating alignment film[J]. Chinese journal of liquid crystals and displays, 2020, 35(4): 341-349.
DOI：

Ping WANG, Hui NIE, Huan LI, et al. Quality improvement of inkjet coating alignment film[J]. Chinese journal of liquid crystals and displays, 2020, 35(4): 341-349. DOI： 10.3788/YJYXS20203504.0341.

摘要

薄膜晶体管液晶显示器（TFT-LCD）成盒配向膜涂覆工艺中，配向膜的厚度、均一性和涂覆膜面质量直接影响液晶显示器的显示效果，为此本文研究了喷墨涂覆工艺对配向膜质量的影响。首先优化喷墨涂覆工艺，分析了喷吐频率对喷吐量及其均一性有显著影响。其次分析了负压、涂覆速度、配向膜溶液固含量、涂覆密度等条件对配向膜膜面质量的影响。实验表明当喷吐频率为1 000~8 000 Hz时，喷吐量均一性满足要求；当吐出频率达到10 000 Hz时，喷吐量严重不均一，不满足生产需求。得出喷涂频率、吐出量、负压、涂覆速度、配向膜溶液固含量、涂覆密度的优化条件分别为：3 000~5 000 Hz、50~70 pL、中心值±100 Pa、500~600 mm/s、（3.9±0.4）%、50%~50.3%。降低配向膜溶液固含量可改善涂覆性不均缺陷，改变吐出密度可改善涂覆性不均缺陷，画质质量得到提升。本文对成盒工段配向膜涂覆质量优化取得了良好效果，能满足工程实践量产的需要。

Abstract

In the TFT-LCD cell PI coating process

the film thickness and uniformity of polyimide alignment film and the quality of coating film surface are the most important. The effects of ink-jet coating on the quality of alignment film are studied. Firstly

the ink-jet coating process is optimized

the influence of the spray frequency on the amount of vomiting is analyzed. The frequency of vomiting has a significant impact on the amount of vomiting and its uniformity. Secondly

the effects of negative pressure

coating speed

solid content of the solution and coating density on the surface quality of the film are analyzed. When the frequency of vomiting is 1 000~8 000 Hz

the uniformity of the amount of vomiting can meets the requirements. When the frequency of vomiting reaches 10 000 Hz

the amount of vomiting is seriously uneven

which can not meet the production demand. The optimum conditions of spraying frequency

vomiting volume

negative pressure

coating speed

solid content of the solution and coating density are obtained as follows:3 000~5 000 Hz

50~70 pL

center value±100 Pa

500~600 mm/s

(3.9±0.4)%

50%~50.3%. Reducing the solid content of the solution of the alignment membrane can improve the non-uniform coating defects

changing the vomiting density can improve the non-uniform coating defects

and improve the quality of the painting. In this paper

the quality optimization of directional film coating in box-making section has achieved good results

which can meet the needs of mass production in engineering practice.

关键词

Keywords

references

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