Have you ever wondered how smart glasses work? The brief answer is that they work by combining a range of hardware components, micro-projectors, sensors, a CPU, and an operating system that can connect to the internet!
The micro-projector integrated into the glasses points the light toward the lenses, which then reflect that light into your eyes. Additionally, the display can be on one lens or both lenses.
Still confused? Well, don’t worry. Let’s dive deeper into the details and understand how smart glasses actually work, which tech giants like Meta, Google, and Apple are competing to develop.
Table of Contents
How Smart Glasses Work
To really understand how smart glasses work, we need to take them apart so we can figure out the function of each component, whether in the lenses or the arms, and how these tech parts work together.
In this article, we will discuss smart glasses that display augmented reality (AR) on the lenses, such as the Meta Ray-Ban Display and VITURE Pro XR. In most cases, they also come equipped with a camera, battery, speakers, and sensors, sometimes more.
Smart Glass Components
| Hardware Component | Primary Function |
|---|---|
| Lenses (Waveguides) | Directing light through micro-grids to display transparent AR images. |
| Micro-Projector | Generating color images via LED emitters for lens projection. |
| Processor (CPU) | The brain managing AI tasks and wireless computational operations. |
| Battery Unit | Powers the device, balanced within the frame arms. |
| Storage (ROM) | Internal memory for saving media and apps (up to 32GB). |
| Memory (RAM) | Ensures system responsiveness and smooth data processing. |
| Camera | Captures high-resolution first-person photos and videos. |
| Audio System | Speakers and mics for clear voice assistance and calls. |
| Smart Sensors | Gyroscopes and sensors for head tracking and display stability. |
Can you imagine, some smart glasses have all these parts and more? What’s amazing is that they’re so light, weighing just 70 grams or even less, which is about the same weight as an egg!
It’s important to note that the more features the glasses have, the higher the price. Check out the prices of smart glasses for more details.
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1. Lenses
First, let’s talk about the lenses. The lenses in smart glasses are unlike any other eyeglass lenses. They are carefully designed with great engineering precision and specifically tailored to direct light from the micro-projector built into the glasses to your eyes, thanks to waveguide technology.
The lens is designed with microscopic structures etched into the lenses called “grids” or “patterns.” This light cannot be projected directly onto a regular lens, simply because the eye is so close to the lens. The light would scatter and cause many complications. These precisely carved layers on the glasses are usually types:
- Input Grating: Its function is to receive light from the built-in projector.
- Fold Grating: It directs and guides the light inside the lens through reflection.
- Output Grating: It directs the light back toward the user’s eyes.
This lens design makes it possible for smart glasses to apply the following features:
- Makes the content displayed by the glasses appear distant, making them easier to use.
- Allows the display to be transparent, so it doesn’t block your view of the physical reality behind the displayed content.
- This lens design ensures that no one else can see the display screen.
- Prevents glare and eye strain.
2. Micro Projectors
The projector is typically located at the lens angle and uses a system called LCOS, which is similar to how LCD screens work: there are three LED light emissions (red, blue, and green).
This light is transferred from the projector to the grids etched with extreme precision onto the lens, and then to the user’s eyes.
3. Processor
The smart glasses’ processor is tiny and is usually placed in one of the two arms of the glasses, while the battery is in the other arm to ensure proper weight balance. Every small detail matters in the realm of smart glasses; we’re talking about extremely small, complex technical components that measure no more than a few centimeters.
The Meta Ray-Ban Display glasses, for example, use a Snapdragon AR1 processor that enables the glasses to function as a standalone, wireless device and perform complex calculations. This is coupled with a cooling system that draws heat away from your head.
4. Battery
One of the major challenges facing the smart glasses industry is integrating a battery that has a large capacity, long battery life, low weight, and is small enough to fit on the arm of the glasses!
That is why most smart glasses currently have a low battery capacity and last only a few hours compared to smartphone batteries. However, as technology advances, more efficient batteries will undoubtedly be developed.
To overcome this challenge, some smart glasses manufacturers are now offering a charging case that works like a power bank. You can charge it, take it with you, and place your glasses inside so you can recharge them a few times a day! I think this is a smart and innovative solution.
5. Storage
Smart glasses contain a micro memory chip, typically located next to the processor and extremely small in size, providing up to 32 GB of ROM and up to 2 GB of RAM.
6. The camera
The camera is usually located in the front frame of the smart glasses, above the lenses or in the upper corner, for the obvious reason of capturing the user’s first person prospective (POV) from their angle of eyesight, meaning they can capture exactly what they see.
Smart glasses cameras is tiny and similar to the quality of smartphone cameras from 4–5 years ago, it offers 3K video quality and 12-megapixel photos. The cameras will undoubtedly be improved in the coming years, and the con of lacking a flash for low-light and night vision capturing will be resolved.
7. Headphones and Microphones
Smart glasses include speakers that allow users to listen to audio and music, as well as a microphone for voice communication. Some smart glasses come with noise-canceling technology and specialized features.
8. Touchpad
Some smart glasses have a touchpad on the arm of the glasses, allowing users to easily control the glasses.
9. Sensors
Smart glasses are equipped with sensors such as a gyroscope, which measures the rotation and movement of your head, and an accelerometer, which detects whether the glasses are facing up or down to orient the display accurately.
Not All Smart Glasses are the same
It is important to note that hardware components vary significantly depending on the device’s purpose. High-end AR glasses carry built-in processors, many popular models do not feature a heavy standalone CPU.
Most smart glasses rely on smartphones or cloud computing for processing, rather than handling everything internally.
Smart Glasses Software OS
The operating system is responsible for utilizing hardware components and making them controllable by the user. Take Android, for example, which will be integrated into Google’s upcoming smart glasses Android XR this year while Meta uses Meta Horizon OS in their smart glasses.
Every pair of smart glasses uses an operating system to display images, control audio, browse the web, and perform all the functions typically found in a smartphone’s operating system.
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Smart glasses work much like smartphones and smartwatches—they consist of a set of hardware components that operate in harmony with a software operating system—and they contain a great deal of sophisticated and complex software and carefully engineered technology packed into an extremely small size.
Personally, I consider them a breakthrough and a marvel of our time, and one of the most astonishing and exciting modern innovations.
Mohammed Al-Bardawili
Founder of Smart Glasses VR, based in Gaza, Palestine. With 5 years of experience in product reviews, Mohammed researches, analyzes, and compares devices to provide users with the ultimate guide. He is deeply passionate about smart hardware, especially smart glasses, and stays up-to-date with every new launch—you could call him a true nerd in this field.
