Dr. Valery K. Abrahamyan Profile

Dr. Valery K. Abrahamyan

at Yerevan State Univ

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Proceedings Article | 4 March 2022 Poster + Paper

Apparatuses for preparing and investigation of liquid crystal devices

Hakob Margaryan, Nune Hakobyan, Hakob Chilingaryan, Valery Abrahamyan, Nelson Tabirian

Proceedings Volume 12023, 120230C (2022) https://doi.org/10.1117/12.2614608

KEYWORDS: Liquid crystals, Control systems, LCDs, Polymerization

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Today, liquid crystals (LC) and LC polymers (LCP) are the basis of display technologies and widely use in research laboratories for creation of new generation optical elements. In the above-mentioned technologies LC cells are used as a check sample. Having rich experience in the field, we are well acquainted with devices used for LC cells making and investigation. In particular, cell filling is mainly carried out in non-standard conditions using the technical capabilities of laboratories, and to study time and electro-optical characteristics standard generators and oscillographs are used. In this paper our developed devices for LC cells making and investigation are presented. Currently, research laboratories work with high-quality, expensive LC materials, and their use without losses is an urgent task. In addition, when filling LC cells, it is necessary to strictly control technological parameters and visually observe the process. In our developed “LC Vacuum Filler” device all these tasks are solved in a complex manner. Another device, “LC Driver” is designed to generate signals of various shapes, to control the operation of LC devices and to register phase change under influence of control signals. The following technical opportunities are available: selection and configuration of various waveforms, registration of control voltage amplitude and signal from output of photodiode, smooth change of control voltage within the given range by the selected rate, registration of phase shift vs. the applied voltage. To ensure the required temperature conditions, the device is equipped with a temperature stabilization unit based on Peltier elements.

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