High-performance switchable visor for augmented reality using low-voltage, fast-response cholesteric liquid crystals

초록

We present a high-performance switchable visor designed for augmented reality (AR) applications, employing a dye-doped cholesteric liquid crystal (CLC) that operates at an ultra-low driving voltage of just 6 V—an 86 % reduction compared to conventional 44 V CLC devices. By utilizing a 270° twist configuration, the device achieves a substantial transmittance modulation of 35 %, while maintaining an initially transparent state. The incorporation of a low-refractive-anisotropy LC suppresses waveguiding effects, further enhancing optical contrast. To overcome the slow relaxation typical of negative dielectric LCs, we integrated dual-frequency LCs, enabling ultrafast switching with turn-on and turn-off times of 6.18 ms and 1.83 ms, respectively. These combined features deliver high contrast, low power consumption, and real-time responsiveness—critical for wearable AR systems. Experimental demonstrations show that the visor selectively darkens AR content regions without compromising background transparency, offering a compelling solution for next-generation AR displays that require both dynamic control and energy efficiency. © 2025 Elsevier Ltd

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