A5006710255- Liquid Crystal Research Advancements
- Plant Reproductive Biology
- Optical Polarization and Ellipsometry
- Photonic Crystals and Applications
- Thin-Film Transistor Technologies
- Semiconductor Lasers and Optical Devices
- Climate Change and Health Impacts
- Cardiac Imaging and Diagnostics
- Cancer, Lipids, and Metabolism
- Optical Imaging and Spectroscopy Techniques
- Advanced Optical Imaging Technologies
- Electrowetting and Microfluidic Technologies
- Advanced Materials and Mechanics
- Liver Diseases and Immunity
- Cardiovascular Function and Risk Factors
- Liver Disease Diagnosis and Treatment
- Thermoregulation and physiological responses
National Taiwan University
2023
University of Auckland
2022
National Yang Ming Chiao Tung University
2012-2014
We have developed a general approach to perform direct measurements of the pretilt angles from 0° 75° in hybrid-aligned nematic (HAN) liquid-crystal cells whose cell gaps can also be accurately determined with help known angles. In this paper, we used Zeeman laser system measure angular-dependence phase retardation HAN and MATLAB mathematical software carry out theoretical calculations fit measured data derive general, adjacent opposite substrates are different. Our were good agreement two...
We have developed a simple optical method based on measurements of phase retardation versus out-of-plane cell rotation angle and data analyzed by extended Jones matrix to obtain pretilt angles inverse twisted nematic (ITN) tilted homeotropic liquid crystal (LC) cells. In our Jones-matrix calculations, we assumed constant as the LC-director tilt throughout ITN well cell. compared measured with those an accompanying (ATH) The results showed increasing discrepancies between them rubbing depth...
Modern thin-film-transistor-driven twisted nematic (TN) products on the market require thin cell gaps below value to satisfy condition of Gooch-Tarry first minimum in transmission for fast response times and wide viewing angles. For time our knowledge, we have developed a simple experimental method based new configuration out-of-plane rotation analyzed data by extended Jones matrix obtain accurate pretilt angles such TN cells where well-accepted Birecki Kahn [The Physics Chemistry Liquid...
Laser speckle contrast imaging (LSCI) can generate retinal blood flow maps inexpensively and non-invasively. These be used to identify various eye disorders associated with reduced flow. Despite early success, one of the major obstacles clinical adoption LSCI is poor repeatability modality. Here, we propose an registration pipeline that registers correct for rigid movements. Post-registration, intra(same)-day inter(next)-day are studied using quantitative metrics. We have intra-day by...
Abstract For the first time we report direct measurements on asymmetric pretilt angles of OCB cell (pi‐cell) with results in good agreement measured accompanying tilted homogenous cells fabricated by using same material and processing steps. Our method has potential applications to monitor changing fresh made or aged pi‐cells.
Abstract We have developed a simple optical method and analyzed data by extended Jones matrix to obtain pretilt angles of invesed twist nematic (ITN) tilted homeotropic liquid crystal (LC) cells. compared the measured ITN cell with those an accompanying (ATH) cell. The results showed increasing discrepancies between them rubbing depth for LC alignments. However, these could be explained assuming that surface‐LC tilt angle was equal ATH generate director‐deformation profile within based on...
Abstract In general, the optical properties of any general twisted nematic cells consist two complementary effects: LC‐birefringent and LC‐director‐twist effects. this paper, electro‐optical ITN without chiral dopants with different pretilt angles have been investigated for first time to differentiate effect from LC‐twist effect. We transient responses cell found that optical‐bounce (LC backflow) occurred in transition homeotropic‐to‐planar states under high applied voltages where...
Abstract Curtain Mura is caused by stress‐induced change in optical parameters of the TFT‐TN panel after COG ACF process. We have used simulation to identify most sensitive among cell gap, pretilt and twist angles that could be changed induced residual stress cause Mura. also measured optical‐parameter variations Normal zones on a panel. conclude occurs mainly due angle point out TN‐cell gap designed at Gooch‐Tarry first‐ minimum an effective way reduce occurrence