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Related Experiment Video

Updated: Jun 6, 2026

Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets

Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets

Published on: May 15, 2017

Improved liquid crystal pretilt angles by patterned dual alignment coating structures.

G M Wu¹, H W Chien, C N Chen

¹Institute of Electro-Optical Engineering, Department of Electronic Engineering, Chang Gung University, Kweisan, Taoyuan 333, Taiwan, Republic of China.

Journal of Nanoscience and Nanotechnology

|December 7, 2010

Summary

This summary is machine-generated.

Novel patterned dual alignment coatings significantly improved liquid crystal pretilt angles in optically compensated bend (OCB) devices. This advancement enhances OCB mode performance by reducing configuration transitions and improving response times.

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Last Updated: Jun 6, 2026

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Published on: May 15, 2017

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Area of Science:

Materials Science
Physics

Background:

Optically compensated bend (OCB) mode liquid crystal displays (LCDs) are known for their fast response times.
Achieving optimal performance in OCB mode requires precise control over liquid crystal pretilt angles.

Purpose of the Study:

To improve pretilt angles in OCB mode liquid crystals.
To reduce the transition from splay to bend configurations.
To enhance the response time of OCB devices.

Main Methods:

Development of novel dual alignment coating structures using horizontal alignment polyimide (PI) and patterned vertical alignment liquid crystal polymer (LCP).
Utilized photolithography with three distinct patterning masks (triangle lattice, square lattice, honeycomb lattice).
Employed a force balance model to predict and illustrate pretilt angle variations based on LCP area ratio.

Main Results:

Achieved increased pretilt angles: 34 degrees for triangle lattice, 31 degrees for square lattice, and 24 degrees for honeycomb lattice array-patterned cells.
Demonstrated effective control over pretilt angles through patterned dual alignment.
Improved response time to 2 ms at 5.5 V ramp-up voltage for OCB mode devices.

Conclusions:

Novel patterned dual alignment coatings offer effective control over liquid crystal pretilt angles in OCB mode.
The LCP area ratio is a key factor in predicting and achieving desired pretilt angles.
Enhanced pretilt angle control leads to significant improvements in OCB device response times.