Augmented reality (AR) glasses are transitioning from research prototypes to early commercial products. Advances in artificial intelligence (AI), mobile processors, and display technologies are driving industry interest and positioning AR glasses as a potential next-gen computing platform.
In previous Laser Focus World articles, I discussed the broader path from AR glasses prototypes to viable wearable products and the role of waveguide architecture in determining device viability. These discussions examined how optical efficiency, manufacturability, durability, and system integration influence the transition from laboratory prototypes to commercial devices.1,2 Let’s now look more closely at waveguide architectures and the engineering tradeoffs required to achieve high brightness, low power consumption, and lightweight optical systems suitable for everyday use.
AR glasses as the next computing platform
The evolution of computing—from mainframes to PCs to smartphones—is bringing devices closer to the user. AR glasses represent the next step in this progression: Wearable systems that integrate digital information directly into the user’s field of view.
But significant engineering challenges remain before AR glasses can support practical, everyday use. Among these, the most critical is the tradeoff between functionality and form factor across integrated display and waveguide architectures.
Capability vs. everyday usability
Today’s AR devices fall mainly into two categories. The first consists of high-functionality spatial-computing headsets, while the second aims for lightweight glasses-like form factors suitable for everyday wear. Headset devices offer powerful capabilities, but are not well suited for daily use. In contrast, lightweight AR glasses must operate within severe constraints on battery capacity, processing power, and device size. In many cases, the battery capacity available in AR glasses is only a small fraction of that of a smartphone.
To ensure AR glasses are practical for everyday use, product owners and designers must simultaneously achieve sufficient display brightness, acceptable battery life, and a comfortable wearable form factor.
Recent progress in the AR ecosystem demonstrates how these design principles translate into practical systems. Recent activity across the AR ecosystem—including efforts by software platform providers such as jig.jp—illustrates how closer integration between optical systems and application layers can support the development of lightweight, power-efficient AR glasses.
Power consumption in AR displays
When designing AR glasses within battery constraints, product owners and engineers must recognize the majority of system power consumption is concentrated in two components: Display module, and system on chip (SoC).
As a result, simply increasing display brightness is not always the best design strategy. Increasing brightness directly increases power consumption, which reduces battery life. Larger batteries can compensate for this, but they also increase device weight and size. For wearable devices such as AR glasses, this tradeoff is particularly important because device weight and comfort directly affect user experience.
Brightness depends on real-world environments
AR systems must operate across widely varying lighting conditions: Indoor environments tend to have ~100 to 200 nit background luminance, while outdoor environments have significantly higher ambient brightness.
A single “maximum brightness” design target does not reflect real-world usage. Instead, systems must align optical performance with intended operating environments.
Many early AR applications—such as translation, notifications, and navigation—operate effectively at moderate brightness levels, whereas watching video, a display with higher brightness efficiency is required and the battery also needs to be larger. In these cases, optimizing power efficiency and reducing weight can deliver more value than maximizing peak luminance. This reinforces the need for a use-case-driven design approach, where system architecture aligns with real-world application requirements.
Use cases drive system architectures
Different AR use cases impose distinct system requirements: Enterprise workflows (e.g., maintenance, retail support) require a long operating time, demand stable brightness and contrast, and operate under varied lighting conditions. But consumer and mobility applications (think navigation) prioritize a lightweight form factor, benefit from a wider field of view (FoV), and must be comfortable for all-day wear.
These requirements directly influence: Use case → brightness → power → battery → form factor. Because waveguides sit at the center of this chain, their design impacts overall system performance.
Cellid conducted a proof of concept with various organizations to examine brightness and ideal form factor for AR glasses. Pilot programs with organizations such as Sumitomo Mitsui Banking Corporation (SMBC) are exploring AR-assisted workflows for retail environments, including applications such as product recognition and customer support in convenience store settings.
Within the mobility sector, collaborations with Subaru are examining how AR interfaces can support vehicle-related information and operational workflows.
Research partnerships with institutions, such as the Institute of Science Tokyo, along with materials collaborations involving Mitsui Chemicals, are also advancing the underlying optical and materials technologies required for next-gen AR systems.
Beyond this, public-sector initiatives such as projects with the Tokyo Metropolitan Government are evaluating AR glasses for infrastructure inspection and field operations.
Waveguide design tradeoffs
These system-level constraints are not determined by a single component, but by the interaction between the display engine, waveguide, battery, and system electronics. Among these components, the waveguide plays a particularly important role because it directly influences optical efficiency, FoV, device weight, and mechanical structure.
Waveguides play a central role in determining AR device viability. Waveguide design impacts optical efficiency, FoV, device weight, mechanical robustness, and manufacturing scalability.
Expanding FoV introduces several challenges, such as larger angular bandwidth requirements, increased sensitivity to fabrication tolerances, and more complex pupil expansion and brightness uniformity.
Product owners and engineers must carefully manage diffraction efficiency along the propagation path to maintain uniform brightness while avoiding artifacts such as ghosting or color shift. Eyebox size must also support natural eye movement and user variability, which further increases design complexity.
Materials selection: Plastic vs. glass waveguides
Material selection significantly impacts both optical performance and system ergonomics. For many AR designs, the waveguide assembly can account for approximately 40% of total device weight, which makes it a critical factor in comfort and battery efficiency.
Plastic (polymer) waveguides—advanced optical polymers—now offer high optical clarity, low birefringence, and precise microstructure replication. Its key advantages are reduced weight for improved comfort, high impact resistance, compatibility with scalable manufacturing (injection molding, nanoimprinting), and greater flexibility in thickness and curvature.
These characteristics make polymer waveguides well suited for consumer and enterprise AR applications where lightweight design is essential. But engineers must carefully manage thermal expansion, environmental stability, and microstructure precision.
Glass waveguides (glass substrates) provide high thermal stability, environmental durability, and long-term dimensional precision. These properties make glass suitable for specialized applications that require stability under extreme conditions.
Material selection should follow application requirements: Polymer waveguides for lightweight wearable systems, and glass for high-stability environments.
Mechanical integration and thermal considerations
System architecture must integrate optical, mechanical, and thermal design from the outset. Key considerations include display engine placement (affects coupling geometry and thickness), battery placement (affects balance and comfort), and heat generation (affects optical alignment and performance).
Engineers must combine optical simulation, thermal modeling, and mechanical design to ensure stable image quality for real-world conditions.
Manufacturing scalability
Even the most advanced optical designs must scale economically. Waveguide manufacturing requires high microstructure fidelity, consistent diffraction efficiency, stable refractive index properties, and low defect rates.
Technologies such as injection molding and nanoimprint lithography enable high-volume production of polymer waveguides, but maintaining consistency across large-scale manufacturing remains a key challenge.
Recent developments show how these principles translate into practical systems. Reference designs that integrate waveguides, display modules, and system electronics allow developers to evaluate real-world tradeoffs between brightness, power consumption, battery life, and device weight.
AR reference platforms demonstrate how integrated system design can accelerate development while validating performance in real-world environments. These platforms help bridge the gap between laboratory innovation and commercially viable AR products.
Practical everyday AR
AR glasses will not succeed through a single breakthrough. Instead, they will emerge through careful coordination across waveguide design, display engines, materials engineering, mechanical integration, and manufacturing processes.
Designers must continuously balance optical performance, power efficiency, battery life, and wearable comfort. Waveguides sit at the center of this convergence. By optimizing them within a system-level framework, engineers can enable AR glasses that move beyond short demonstrations to support everyday use.
REFERENCES
1. See www.laserfocusworld.com/55287451.
2. See www.laserfocusworld.com/55307350.
About the Author
Satoshi Shiraga
Satoshi Shiraga is the cofounder and CEO of Cellid Inc. (Japan), a developer of augmented reality (AR) waveguide technology. With over 20 years of experience in the field of optical design, Satoshi has been instrumental in advancing AR glasses, focusing on high-performance waveguides that enable the sleek, lightweight, and high-resolution devices needed for widespread AR adoption.
Before founding Cellid, Satoshi conducted particle physics research at prestigious institutions including CERN (European Organization for Nuclear Research), Fermilab (Fermi National Accelerator Laboratory, U.S.), and INFN (National Institute for Nuclear Physics, Italy). He holds a master’s degree in physics from Waseda University Graduate School, where he specialized in particle physics, and was later invited to serve as a researcher at Waseda University.