High-contrast and scattering-type transflective liquid crystal displays based on polymer-network liquid crystals

Cheng Kai Liu, Wei Hsuan Chen, Chung Yu Li, Ko Ting Cheng

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

The methods to enhance contrast ratios (CRs) in scattering-type transflective liquid crystal displays (ST-TRLCDs) based on polymer-network liquid crystal (PNLC) cells are investigated. Two configurations of ST-TRLCDs are studied and are compared with the common ST-TRLCDs. According to the comparisons, CRs are effectively enhanced by assembling a linear polarizer at the suitable position to achieve better dark states in the transmissive and reflective modes of the reported ST-TRLCDs with the optimized configuration, and its main trade-off is the loss of brightness in the reflective modes. The PNLC cell, which works as an electrically switchable polarizer herein, can be a PN-90° twisted nematic LC (PN-90° TNLC) cell or a homogeneous PNLC (H-PNLC) cell. The optoelectric properties of PN-90° TNLC and those of H-PNLC cells are compared in detail, and the results determine that the ST-TRLCD with the optimized configuration using an H-PNLC cell can achieve the highest CR. Moreover, no quarter-wave plate is used in the ST-TRLCD with the optimized configuration, so a parallax problem caused by QWPs can be solved. Other methods for enhancing the CRs of the ST-TRLCDs are also discussed.

Original languageEnglish
Article number739
JournalPolymers
Volume12
Issue number4
DOIs
StatePublished - 1 Apr 2020

Keywords

  • Light scattering
  • Linearly polarized light
  • Liquid crystals
  • Polymer networks
  • Transflective liquid crystal displays

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