A double-element broad-band liquid crystal tunable filter-factors affecting contrast ratio

1992 ◽  
Vol 28 (2) ◽  
pp. 501-506 ◽  
Author(s):  
J. Staromlynska
Keyword(s):  
Liquid Crystal ◽  
Broad Band ◽  
Contrast Ratio ◽  
Tunable Filter ◽  
Factors Affecting ◽  
Filter Factors

scholarly journals Patterned waveguide liquid crystal displays

RSC Advances ◽  
2020 ◽  
Vol 10 (68) ◽  
pp. 41693-41702
Author(s):  
Yunho Shin ◽  
Jinghua Jiang ◽  
Guangkui Qin ◽  
Qian Wang ◽  
Ziyuan Zhou ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Switching Time ◽  
Contrast Ratio ◽  
Liquid Crystal Displays ◽  
High Contrast ◽  
High Brightness ◽  
Photo Polymerization ◽  
Ultrafast Switching ◽  
Light Waveguide ◽  
Polymer Stabilized

A polymer stabilized LC based light waveguide display is reported. Performance is improved by patterned photo-polymerization or electrode. It has high brightness, ultrafast switching time, high contrast ratio, and high transmittance for transparent and augmented displays.

Enhancement of Contrast Ratio by Using Ferroelectric Nanoparticles in the Alignment Layer of Liquid Crystal Display

2008 ◽  
Vol 47 (6) ◽  
pp. 4751-4754 ◽  
Author(s):  
Sudarshan Kundu ◽  
Mitsuhiro Akimoto ◽  
Itaru Hirayama ◽  
Masaru Inoue ◽  
Shunsuke Kobayashi ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystal Display ◽  
Contrast Ratio ◽  
Alignment Layer

scholarly journals Liquid Crystal Based Head-Up Display with Electrically Controlled Contrast Ratio

Crystals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 311
Author(s):  
Yueda Liu ◽  
Yan Li ◽  
Quanming Chen ◽  
Sida Li ◽  
Yikai Su
Keyword(s):  
Liquid Crystal ◽  
Geometric Phase ◽  
Cholesteric Liquid Crystal ◽  
Contrast Ratio ◽  
Driving Safety ◽  
Ambient Light ◽  
Circular Polarizer ◽  
Relative Brightness ◽  
Liquid Crystal Lens ◽  
Good Visibility

With the growing demand for driving safety and convenience, Head-Up Displays (HUDs) have gained more and more interest in recent years. In this paper, we propose a HUD system with the ability to adjust the relative brightness of ambient light and virtual information light. The key components of the system include a cholesteric liquid crystal (CLC) film, a geometric phase (GP) liquid crystal lens, and a circular polarizer. By controlling the voltage applied to the GP lens, the contrast ratio of the virtual information light to ambient light could be continuously tuned, so that good visibility could always be obtained under different driving conditions.

scholarly journals Light Leakage of Multidomain Vertical Alignment LCDs Using a Colorimetric Model in the Dark State

2018 ◽  
Vol 2018 ◽  
pp. 1-6
Author(s):  
Chuen-Lin Tien ◽  
Rong-Ji Lin ◽  
Shang-Min Yeh
Keyword(s):  
Liquid Crystal ◽  
Contrast Ratio ◽  
Liquid Crystal Displays ◽  
Vertical Alignment ◽  
Dark State ◽  
Proposed Model ◽  
Color Shift ◽  
Depolarization Of Light ◽  
The Difference ◽  
Color Filters

Light leakage from liquid crystal displays in the dark state is relatively larger and leads to a degraded contrast ratio and color shift. This work describes a novel colorimetric model based on the Muller matrix that includes depolarization of light propagating through liquid crystal molecules, polarizers, and color filters. In this proposed model, the chromaticity can be estimated in the bump and no-bump regions of an LCD. We indicate that the difference between simulation and measurement of chromaticity is about 0.01. Light leakage in the bump region is three times that in no-bump region in the dark state.

scholarly journals Hyperspectral Fluorescence LIDAR Based on a Liquid Crystal Tunable Filter for Marine Environment Monitoring

Sensors ◽  
2020 ◽  
Vol 20 (2) ◽  
pp. 410
Author(s):  
Eleonora Aruffo ◽  
Andrea Chiuri ◽  
Federico Angelini ◽  
Florinda Artuso ◽  
Dario Cataldi ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Marine Environment ◽  
Detection System ◽  
Tunable Filter ◽  
Spectral Interval ◽  
Environment Monitoring ◽  
Research Activities ◽  
Custom Made ◽  
New Instrument ◽  
Marine Environment Monitoring

An innovative hyperspectral LIDAR instrument has been developed for applications in marine environment monitoring research activities, remotely detecting the fluorescence spectra produced in the spectral interval between 400 nm and 720 nm. The detection system is composed by a custom made photomultiplier charge integrating and measuring (CIM) unit, which makes automatic background signal subtraction, and a liquid crystal tunable filter (LCTF). The new instrument therefore has hyperspectral resolution and allows automatic background subtraction; it is compact and automated by custom software that permit to adapt the instrument properties depending on the environmental conditions. Laboratory tests to characterize the instrument performance have been carried out, concluding that this sensor can be employed in remote sites for Chl-a detection.

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