Laser control for smart glasses
31 October 2024
Opto-Electronics
TDK Corporation has successfully developed a full-colour laser control device for 4K smart glasses using lithium niobate (LiNbO3) thin film. The device was demonstrated at CEATEC 2024, which took place from 15-18 October 2024 in Chiba, Japan.
The most significant feature of the smart glasses is the use of lithium niobate thin film, enabling visible light control at speeds more than 10 times faster than conventional laser colour control. Whereas conventional visible light lasers change colour by controlling electrical current, the lithium niobate thin film does this by controlling voltage. As a result, it supports video resolutions of 4K or higher, which require high-speed control, while power consumption is expected to decrease.
A video demonstration was conducted in collaboration with QD Laser to validate functions for AR/VR smart glasses. The device was successfully combined with the direct retinal projection technology from QD Laser, confirming that a device using lithium niobate thin film can function as an imaging device.
At present, lithium niobate is garnering considerable attention in the field of long-distance high-speed optical communication such as Beyond 5G/6G, with many highlighting its applications with near-infrared light. But very few have considered its applications with visible light. In the development of full-colour laser modules for AR/VR smart glasses, TDK focused on lithium niobate to break through future speed limitations of visible light lasers. Research and development have confirmed that it can control all three primary colours of light – red, green, and blue.
The thin film for this device is formed by a sputtering method, which has been cultivated over the years and is better for mass production, rather than the conventional method of bonding lithium niobate to a substrate using bulk material. By applying this proprietary technology, TDK manufactured and tested lithium niobate devices for the first time.
The results of this device development can be applied not only to video devices for AR/VR smart glasses but also in fields with significant future growth. More specifically, TDK is considering use in high-speed optical communication in data centres, which are experiencing a rapid expansion in data volumes due to DX and other factors, and high-speed optical wiring in generative AI, which requires technological development to improve performance in the future.
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