Grace Lee | Mojo: Can integrated micro-optics really cut your AR display's power consumption by 80%?
13:40 - 15:00
Other snippets from this talk
Summary of the clip:
Can integrated micro-optics really cut your AR display's power consumption by 80%?
Waveguide-based AR architectures suffer from severe optical coupling losses because their internal total internal reflection (TIR) mechanics can only accept light within a narrow angular cone—typically around 30 degrees. Standard Lambertian microLED emitters waste up to 90% of their light, radiating it at angles that the waveguide cannot trap, leading to excessive power dissipation and thermal management crises.
To solve this etendue-matching challenge, Mojo Vision integrates specialized micro-optics directly on top of their micron-scale microLED emitters. By matching the micro-lens design directly to the sub-2-micron pixel aperture, they can collimate and reshape the emission pattern directly at the source, steering the light specifically into the acceptance cone of the waveguide.
This precise micro-optical integration yields a boosting factor of up to five times in coupling efficiency. This enhancement directly translates into a 5x reduction in display operating power, addressing one of the most critical bottlenecks in designing slim, all-day wearable AR smart glasses.
In this short video, you can learn:
* Why the narrow acceptance angle of AR waveguides results in massive optical power waste from Lambertian emitters.
* The design principles of matching micro-lens arrays directly to sub-2-micron microLED apertures.
* How direct source-level collimation achieves a 5x boost in system-level efficiency and dramatic power savings.
📋 **Clip Abstract** This clip covers the critical optical coupling challenge between microdisplays and AR waveguide systems. Mojo Vision demonstrates how integrating customized micro-optics on top of microLEDs increases usable light throughput by up to five times.
🔗 Link in comments 👇
#MicroOpticsIntegration, #WaveguideCouplingEfficiency, #SourceLevelCollimation, #EtendueMatching, #ARSmartGlasses, #MicroLEDDisplays
This is a highlight of the presentation:
More Highlights from the same talk.
09:04 - 10:46
Why does driving red InGaN microLEDs harder turn your deep red display into orange?
Why does driving red InGaN microLEDs harder turn your deep red display into orange?
High-brightness AR systems require scaling emission intensity over multiple orders of magnitude. However, conventional direct-emission InGaN-based red microLEDs suffer from severe quantum-confined Stark effect (QCSE) and screen charge effects. This leads to a drastic blue shift, altering the red primary color toward orange at elevated current densities and ruining color gamut calibration.
Mojo Vision bypasses these material limitations of red InGaN by utilizing high-efficiency blue microLEDs combined with ultra-stable, custom-engineered red quantum dots (QDs). Operating across an extreme optical flux range from less than 1 W/cm² to 15 W/cm², Mojo's color-converted subpixels maintain remarkable spectral stability with a narrow full-width at half-maximum (FWHM) of approximately 33 nm.
This stability is critical for microdisplay systems that must dynamically adjust from low-power indoor use to high-brightness outdoor AR navigation. By securing stable chromaticity coordinates regardless of driving current, display designers can simplify subpixel rendering algorithms and reduce the overhead of real-time look-up table (LUT) color corrections.
In this short video, you can learn:
* The physics behind InGaN red microLED blue-shifting into orange under high current injection.
* How Mojo Vision achieves a stable 620nm emission with an FWHM of 33nm up to 15 W/cm² of optical excitation.
* The advantages of using customized quantum dot formulations to maintain chromaticity across high dynamic range AR profiles.
📋 **Clip Abstract** This clip explains why conventional InGaN red microLEDs experience undesirable color shifting under high drive currents. Mojo Vision showcases how their proprietary quantum dot color conversion maintains highly stable red emission across extreme brightness levels.
🔗 Link in comments 👇
#QuantumConfinedStarkEffect, #QuantumDotColorConversion, #RedInGaN, #ChromaticityStability, #MicroLEDDisplays, #ARMicrodisplays
10:50 - 12:24
How do you prevent quantum dots from photobleaching under the intense megawatt-scale flux of AR engines?
How do you prevent quantum dots from photobleaching under the intense megawatt-scale flux of AR engines?
While quantum dot color conversion (QDCC) is highly successful in consumer televisions, microdisplays for AR require brightness levels approaching 1 million nits to combat outdoor ambient light. This operational demand subjects the sub-micron QD layers to extreme optical flux densities of several watts per square centimeter, causing standard commercial QDs to rapidly degrade and photobleach within hours.
Mojo Vision addresses this reliability barrier through in-house synthesis of customized quantum dots featuring a proprietary protective inorganic shell coating. This surface passivation layer stabilizes the QD cores against photo-thermal degradation, maintaining stable emission intensity and preventing decay under sustained high-flux conditions.
In comparative testing at an optical flux of 4 W/cm², standard market quantum dots suffered a catastrophic 40% degradation in emission intensity within just 80 hours. In contrast, Mojo’s custom-passivated QDs exhibited flatline reliability past 500 hours of continuous operation, proving the viability of QD-based color conversion for commercial microLED displays.
In this short video, you can learn:
* Why commercial quantum dots degrade rapidly when subjected to the intense optical flux required for million-nit AR displays.
* Mojo Vision’s proprietary protective coating chemistry that chemically stabilizes the quantum dot structure.
* Comparative lifetime data demonstrating stable QD performance past 500 hours under a high 4 W/cm² optical flux.
📋 **Clip Abstract** This clip discusses the critical reliability hurdles of using quantum dot color conversion in high-luminance AR microdisplays. Mojo Vision details their custom inorganic passivation coating that prevents quantum dot degradation under extreme optical flux.
🔗 Link in comments 👇
#QuantumDotColorConversion, #InorganicShellPassivation, #HighFluxReliability, #MicroLEDColorConversion, #ARMicrodisplays, #MicroLEDDisplays