Why FOV is Crucial for AR Glasses

When we put on augmented reality (AR) glasses, it feels like we've opened a magical door, leading us into a new world where virtual and real blend together. One key parameter is deciding how much of this new world we can see - that's the field of view. The field of view is like the width of our vision, determining the range we can see AR content. However, realizing an ideal field of view is no easy feat. Let's delve deeper into this.

First, imagine you're standing in an open field. You can see the scenery before you because you have a wide field of view. If we liken AR glasses in hand to a window, the field of view is the size of the window. A large window (wide field of view) allows you to see more scenery, while a smaller window (narrow field of view) only offers a limited view.

FOV and AR glasses

Ideally, we hope that AR glasses can provide the widest field of view possible, allowing us to freely observe this augmented world as if it were the real world. This way, we can immerse ourselves better in the virtual environment, whether we're playing games or doing design and simulation work.

However, achieving wide field-of-view AR glasses has its challenges. Firstly, the optical design presents huge challenges. To ensure image quality at all viewing angles with a wide field of view, we need complex optical designs and high-precision component manufacturing. This is akin to manufacturing a huge window; it requires not only plenty of material but also precise craftsmanship; otherwise, the window may deform, causing the view to become distorted or blurred.

Secondly, space constraints are a crucial issue. Imagine if we want to install a window on a door, but the door's space is limited. We then have to consider how to install a sufficiently large window in a limited space. Similarly, implementing a wide field of view in compact AR glasses requires us to design a complex optical system in a limited space, which is undoubtedly a daunting task.

In addition, as the field of view increases, the energy required from the light source also increases because light needs to disperse over a larger range. This is like needing stronger light to illuminate a large room. This could potentially reduce the battery life of the AR glasses.

When discussing the field of view, we cannot neglect the impact on the user experience. A wide field of view brings a more immersive visual experience, but it also requires higher image processing capabilities and more accurate head and eye tracking technologies. For example, if you're watching a virtual football game, when you turn your head or eyes, the virtual field needs to correctly follow your line of sight, requiring complex algorithms and high-speed image processing. At the same time, due to the broad field of view, the sharpness of the image also needs to be ensured, posing another technological challenge.

However, technology is always progressing. With the advancement of optical technology, material science, and computational technology, we're gradually overcoming these challenges, making wide-field-of-view AR glasses possible. Future AR glasses might resemble our regular glasses, providing a natural and comfortable visual experience, while also revealing a world full of possibilities. While we still have many challenges to overcome, this goal is not out of reach. Let's look forward to this miraculous future together!

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