Tech Briefs Magazine - June 2022 - Sensor-6

AR Eyeglasses
beams are moving super-fast, so the
pulses sent out from the laser driver
have to be very short.
The System
The system is comprised of three separate
elements. The electronics, consisting
of the MEMS controller and separate
drivers for the mirrors and lasers,
are mounted on a printed circuit board
(See Figure 5). The power source and
electronics are designed to be packaged
into one of the temple pieces of the eyeglass
frames. The scanner module itself,
at less than 1 cm3
, is small enough to
mounted in the eyeglass hinge. Finally,
the optical wave guide with its input and
output couplers are part of the lens.
Calibration
Because of the many parameters,
TriLite calibrates each single device using
machine learning (ML). They use experts
who know exactly which knobs to turn to
get the perfect image quality to produce
the training data. They then import that
data for use by the ML to subsequently do
the calibration automatically. Basically,
there is a target pattern and a real pattern,
and they vary the patterns to make sure
there is an optimal overlap.
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Applications
In actual applications - use cases -
there has to be some sort of input connection,
for example, Bluetooth connected
to a smart phone. You would
then receive notifications as on a smart
watch. But with smart glasses you don't
have to avert your gaze to receive it.
A few examples:
* A bicycle rider could be instructed
where to make the next turn on their
route.
* A skier could see their speed as they're
going down a slope.
* A musician would not have to look
away to see their sheet music.
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* In a hospital, where nurses have to shuffle
through papers while working with a
patient, smart glasses would allow them
to work hands-free, thus making their
job a little easier and reducing one possible
source of contamination.
The TriLite engine would be ideal for
the skier, who is faced with sunlight and
bright snow because the brightness of
the display can be tuned up to 15 lumens,
and it also has high contrast ratio
and a wide and accurate color gamut.
The next level of use case would be
augmented reality. For example, you
could see the map of your route as
you're riding your bike, or at a train station,
you could see an arrow that shows
you which train to get on.
AIRMAR.COM
What's Next?
Dr. Weigand believes that the small
size, light weight, low power consumption,
quality of performance, and design
for manufacturability of the TriLite laser
beam scanner will enable smart glasses
to finally become a practical reality for
the mass consumer market.
This article was written by Ed Brown, Editor
of Sensor Technology. For more information,
visit http://info.hotims.com/82322-160.
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Tech Briefs Magazine - June 2022

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