Far-field and Fresnel Liquid Crystal Geometric Phase Holograms via Direct-Write Photo-Alignment

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.

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High Speed In-Plane Switching Liquid Crystal Cell by Using Photo Alignment Method

Molecular Crystals and Liquid Crystals ◽

10.1080/15421406.2015.1032728 ◽

2015 ◽

Vol 613 (1) ◽

pp. 167-173

Author(s):

Byung-June Mun ◽

Jeong-Ho Cho ◽

Joun Ho Lee ◽

Byeong Koo Kim ◽

Hyun Chul Choi ◽

...

Keyword(s):

Liquid Crystal ◽

High Speed ◽

Liquid Crystal Cell ◽

Alignment Method ◽

Crystal Cell ◽

Photo Alignment

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Continuously Geometric Phase Modulation by using a reflective liquid crystal structure

Optics Communications ◽

10.1016/j.optcom.2021.127847 ◽

2021 ◽

pp. 127847

Author(s):

Yongmo Lv ◽

Shaoyun Yin ◽

Yi Liu ◽

Zhe Li ◽

Peng Li ◽

...

Keyword(s):

Crystal Structure ◽

Liquid Crystal ◽

Geometric Phase ◽

Phase Modulation ◽

Liquid Crystal Structure

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Capillary Flows of Nematic Liquid Crystal

Crystals ◽

10.3390/cryst10111029 ◽

2020 ◽

Vol 10 (11) ◽

pp. 1029

Author(s):

Dina V. Shmeliova ◽

Sergey V. Pasechnik ◽

Semen S. Kharlamov ◽

Alexandre V. Zakharov ◽

Eugeny P. Pozhidaev ◽

...

Keyword(s):

Contact Angle ◽

Liquid Crystal ◽

Nematic Liquid Crystal ◽

Electric Fields ◽

Capillary Flow ◽

Capillary Rise ◽

Vertical Plane ◽

Treatment Technique ◽

Photo Alignment ◽

Wetting Process

In this paper we report the new experimental results on the rise of a liquid crystal in flat capillaries with inner photosensitive surfaces. The capillaries with different surface orientations were prepared by the use of the photo-alignment technique. Such a surface treatment makes it possible to eliminate the noncontrollable influence of a nanorelief on the wetting process, which takes place in the rubbing treatment technique previously used in similar experiments. The dynamics of the capillary rise of a nematic liquid crystal 5CB (4-cyano-4′-pentylbiphenyl) in vertical plane capillaries with photo-aligned substrates were studied for the first time. It was found that the stationary value of a contact angle weakly depends on the direction of a planar surface orientation relative to the direction of a capillary rise. It has been shown that the application of strong electric fields resulted in a decreasing of the contact angle. The results, obtained for the nematic liquid crystal, are compared with the results of an investigation of the capillary flow in a shock-free ferroelectric smectic phase.

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