Liquid crystal alignment at low temperatures in flexible liquid crystal displays

Jeoung Yeon Hwang; Dae Shik Seo

doi:10.1149/1.3473785

Liquid crystal alignment at low temperatures in flexible liquid crystal displays

Jeoung Yeon Hwang, Dae Shik Seo

Department of Electrical and Electronic Engineering

Research output: Contribution to journal › Article › peer-review

10 Citations (Scopus)

Abstract

We report on the pretilt angles of liquid crystals (LCs) at a low baking temperature (120°) and on the retardation values (Δ_nd) with a high birefringence and low cell gap, both of which showed significant improvement in their response time for flexible super twisted nematic cells. Three different types of polyimides (PIs) were used to control the pretilt angle from 9° up to about 40°. A low baking temperature for the PIs with alkyl side chains induced a high pretilt angle. The pretilt angles of the PI-A having alkyl chains and similar LC phases increased rapidly up to 40° after aging (100° C), while the pretilt angles of the PIs with normal alkyl chains decreased. Due to the high birefringence, a low cell gap, and a high pretilt in the flexible display, a fast response time (25% reduction) and low switching voltage (52.8% reduction) are demonstrated.

Original language	English
Pages (from-to)	J351-J357
Journal	Journal of the Electrochemical Society
Volume	157
Issue number	10
DOIs	https://doi.org/10.1149/1.3473785
Publication status	Published - 2010

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Renewable Energy, Sustainability and the Environment
Surfaces, Coatings and Films
Electrochemistry
Materials Chemistry

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This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1149/1.3473785

Cite this

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abstract = "We report on the pretilt angles of liquid crystals (LCs) at a low baking temperature (120°) and on the retardation values (Δnd) with a high birefringence and low cell gap, both of which showed significant improvement in their response time for flexible super twisted nematic cells. Three different types of polyimides (PIs) were used to control the pretilt angle from 9° up to about 40°. A low baking temperature for the PIs with alkyl side chains induced a high pretilt angle. The pretilt angles of the PI-A having alkyl chains and similar LC phases increased rapidly up to 40° after aging (100° C), while the pretilt angles of the PIs with normal alkyl chains decreased. Due to the high birefringence, a low cell gap, and a high pretilt in the flexible display, a fast response time (25% reduction) and low switching voltage (52.8% reduction) are demonstrated.",

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AU - Seo, Dae Shik

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Liquid crystal alignment at low temperatures in flexible liquid crystal displays

Abstract

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