Developing a novel 2D electro-optic scanner for potential micro display and head mounted display application

Wei-Chih Wang; Vinayak Ghorapade; Sudarshan Kalel; Karthickraj Muthuramalingam

doi:10.1117/12.3014671

9 May 2024 Developing a novel 2D electro-optic scanner for potential micro display and head mounted display application

Wei-Chih Wang, Vinayak Ghorapade, Sudarshan Kalel, Karthickraj Muthuramalingam

Proceedings Volume 12948, Soft Mechatronics and Wearable Systems; 129480O (2024) https://doi.org/10.1117/12.3014671
Event: SPIE Smart Structures + Nondestructive Evaluation, 2024, Long Beach, California, United States

Abstract

The goal of the present work is to create a miniature 2D light scanning device without any moving parts using integrated electro-optic (EO) liquid crystal (LC) material. The design is based on changing the propagation direction of a light beam when it is incident to an electro-optic medium with a voltage-controlled index of refraction. To achieve 2D beam steering and scanning, the device is designed in two stages. For horizontal beam steering, a LC prism (thickness = 10 μm) created between two glasses is used to deflect beam by refraction due to change in refractive index of LC. For vertical beam steering, a virtual prism is created between two glasses by offsetting top and bottom electrodes. When an electric field is applied to the electrodes, LC directors create a virtual prism due to physical offset between top and bottom electrodes help to achieve beam deflection in vertical direction. In this work, a simulation study is conducted on the proposed design to achieve 2D deflection of laser beam (λ=632 nm). According to Snell’s law, theoretically, a maximum horizontal deflection of 10.52° is achieved at a prism angle, and incident angle of 66.1° and 21.99° respectively. Whereas through a simulation study, maximum horizontal deflection of 34° and maximum vertical deflection of 13° is achieved at given incident angle. This low-cost and lightweight optical scanner can fit inside a tube with a diameter of less than 5 mm and can be implemented for augmented reality (AR), virtual reality (VR), or standalone microdisplay applications.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Wei-Chih Wang, Vinayak Ghorapade, Sudarshan Kalel, and Karthickraj Muthuramalingam "Developing a novel 2D electro-optic scanner for potential micro display and head mounted display application", Proc. SPIE 12948, Soft Mechatronics and Wearable Systems, 129480O (9 May 2024); https://doi.org/10.1117/12.3014671

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KEYWORDS

Prisms

Liquid crystals

Electrodes

Scanners

Waveguides

Beam steering

Design

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