Tech Briefs Magazine - June 2022 - Sensor-2

Breakthrough Lightweight
AR Eyeglasses
W
ith AR eyeglasses, the screen
of a mobile device can be
transitioned to the lens of a
pair of eyeglasses. The problem
with that is that even though the technology
has been around for a while, the
glasses have been bulky and cumbersome.
I interviewed Dr. Peter Weigand, CEO
of TriLite Technologies (Vienna, Austria)
about a new approach that can lead to
glasses that look and feel normal.
He explained that there have basically
been three waves of light engine
technologies.
LCoS is a panel-based technology that
requires illumination optics. The problem
with it is that you have to make sure
that the illumination is nice and homogeneous
and smooth. Then you project
the input image into the waveguide. It's
not very efficient and since it has more
optical elements, it is very bulky.
MicroLED displays are a semicontechnology,
which
ductor-based
much better than a reflective display
because it's self-emitting. But
is
still, achieving the brightness levels required
for outdoor applications is a
challenge. And since it's a two-dimensional
display, when you go to higher
resolutions and higher fields of view, it
hardly scales.
The technology with the highest level
of miniaturization is laser beam scanning.
A laser beam scanner has three
key elements: an RGB laser module,
which is the light source, consisting of
three separately mounted lasers - a
red, a green, and a blue. They are followed
by optics that collimate the three
laser beams into one. Finally, there are
MEMS mirrors, which generate the
image scans that arrive at the eyeglass
display. This can be done with two mirrors,
one for the x-axis and one for the
y. However, according to Weigand, the
latest generation of TriLite scanners,
Trixel®
3, uses a single two-dimensional
MEMS mirror that moves in both the x
and y directions in order to achieve a
smaller and lighter package.
A Tiny Light Engine
The image to be displayed is created
with electronics that modulate the lasers.
That image has to then be coupled
to an optical waveguide to be sent to the
display. Usually, for that, a laser scanner
uses so-called relay optics, which is basically
a rather large optical element.
However, TriLite couples the laser beam
scanner directly into the input coupler
of the waveguide. That's what enables
the small size (<1 cm3
, 1.5 grams) of the
display engine, which includes the
three lasers, the MEMS
mirror, and the collimating
optics.
One of the main
reasons they are
2
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Sensor Technology, June 2022
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Tech Briefs Magazine - June 2022

Table of Contents for the Digital Edition of Tech Briefs Magazine - June 2022

Tech Briefs Magazine - June 2022 - Intro
Tech Briefs Magazine - June 2022 - Sponsor
Tech Briefs Magazine - June 2022 - Band1
Tech Briefs Magazine - June 2022 - Band2
Tech Briefs Magazine - June 2022 - Cov1
Tech Briefs Magazine - June 2022 - Cov2
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Tech Briefs Magazine - June 2022 - Cov3
Tech Briefs Magazine - June 2022 - Cov4
Tech Briefs Magazine - June 2022 - MD-Cov1
Tech Briefs Magazine - June 2022 - MD-Cov2
Tech Briefs Magazine - June 2022 - MD-1
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Tech Briefs Magazine - June 2022 - MD-23
Tech Briefs Magazine - June 2022 - MD-24
Tech Briefs Magazine - June 2022 - MD-Cov3
Tech Briefs Magazine - June 2022 - MD-Cov4
Tech Briefs Magazine - June 2022 - Sensor-Cov1
Tech Briefs Magazine - June 2022 - Sensor-Cov2
Tech Briefs Magazine - June 2022 - Sensor-1
Tech Briefs Magazine - June 2022 - Sensor-2
Tech Briefs Magazine - June 2022 - Sensor-3
Tech Briefs Magazine - June 2022 - Sensor-4
Tech Briefs Magazine - June 2022 - Sensor-5
Tech Briefs Magazine - June 2022 - Sensor-6
Tech Briefs Magazine - June 2022 - Sensor-7
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Tech Briefs Magazine - June 2022 - Sensor-9
Tech Briefs Magazine - June 2022 - Sensor-10
Tech Briefs Magazine - June 2022 - Sensor-11
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Tech Briefs Magazine - June 2022 - Sensor-14
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Tech Briefs Magazine - June 2022 - Sensor-Cov3
Tech Briefs Magazine - June 2022 - Sensor-Cov4
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