On October 25, Southeast University unveiled the world’s first Polarized Volume Holographic (PVG) waveguide AR glasses, dubbed “Lark.” This groundbreaking technology is entirely self-developed by a Chinese research team from the university’s Institute of Information Display and Visualization.
Transition from SRG to PVG Technology
Traditional AR glasses primarily utilize Surface Relief Grating (SRG) technology. However, the “Lark” glasses leverage the advanced PVG technology.
Key Differences Between SRG and PVG
In simple terms, SRG technology involves engraving tiny periodic structures on the material’s surface, while PVG creates a periodic distribution of refractive index changes within the material through holographic interference. Both methods rely on grating diffraction and total internal reflection for imaging, but PVG excels in light utilization efficiency and cost control.
Advantages of PVG Technology
“The magic of PVG lies in its ability to effectively control the diffraction direction of light, reducing unnecessary energy loss and precisely directing light to the eyes,” explained Zhang Yuning, a professor at Southeast University and director of the Display Research Institute. As a result, the glasses boast higher brightness, extended battery life, and eliminate light leakage and rainbow effects, resulting in clearer and more comfortable visuals.
Impressive Imaging Quality
Imaging quality has always been critical for AR glasses. The “Lark” glasses offer significant advantages in imaging performance, including a 300% increase in light efficiency, substantially enhancing product battery life and display brightness. Forward light leakage has been reduced by 80%, rendering it nearly invisible to onlookers. Additionally, PVG’s unique polarization multiplexing technology ensures a broad field of view and pupil size while maintaining continuity and uniformity in the display.
Cost Efficiency
Cost-wise, the PVG technology used in the “Lark” glasses features a straightforward manufacturing process that does not require expensive micro-nano processing equipment, resulting in a 60% reduction in costs compared to SRG.
Lightweight and Functional Design
Weighing just 45 grams, the “Lark” glasses benefit from a 0.13-inch MicroLED screen from JBD, with a light engine as small as 0.35cc and weighing only 0.6g. This makes the glasses barely noticeable when worn, making them suitable for extended use. They also integrate features such as music playback, real-time translation, intelligent teleprompter functionality, and precise navigation, allowing seamless operation through touch and voice control.
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