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Open AccessArticle

High-Contrast and Scattering-Type Transflective Liquid Crystal Displays Based on Polymer-Network Liquid Crystals

Department of Optics and Photonics, National Central University, Taoyuan 32001, Taiwan
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Polymers 2020, 12(4), 739; https://doi.org/10.3390/polym12040739
Received: 13 February 2020 / Revised: 12 March 2020 / Accepted: 23 March 2020 / Published: 26 March 2020
(This article belongs to the Special Issue Polymer-Based Materials in Liquid Crystals)
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. View Full-Text
Keywords: transflective liquid crystal displays; liquid crystals; polymer networks; linearly polarized light; light scattering transflective liquid crystal displays; liquid crystals; polymer networks; linearly polarized light; light scattering
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MDPI and ACS Style

Liu, C.-K.; Chen, W.-H.; Li, C.-Y.; Cheng, K.-T. High-Contrast and Scattering-Type Transflective Liquid Crystal Displays Based on Polymer-Network Liquid Crystals. Polymers 2020, 12, 739.

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