Bosch Gets Smartglasses Right With Tiny Eyeball Lasers

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Headings…
Bosch Gets Smartglasses Right With Tiny Eyeball Lasers
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A few weeks before CES, Bosch teased the new Smartglasses prototype with this concept video:
Photo: Evan Ackerman/IEEE Spectrum Prototype technology demonstrator for Bosch Smartglasses
Photo: Evan Ackerman/IEEE Spectrum Brian Rossini from Bosch adjusts the prototype Smartglasses.
Rather than projecting an image onto the lenses of the glasses themselves, the Bosch “Light Drive” uses a tiny microelectromechanical mirror array to direct a trio of lasers (red, green, and blue) across a transparent holographic element embedded in the right lens, which then reflects the light into your right eye and paints an image directly onto your retina.
Photo: Evan Ackerman/IEEE Spectrum This photo, taken by a smartphone looking through the glasses, shows an AR image.
Since the Smartglasses are only projecting into one eye, your brain can’t use convergence to determine the focal plane of the AR image, but what the Smartglasses can do (in software) is nudge the image to the left, which will cause your right eye to have to converge a little bit to keep it centered in your field of view.
By adjusting the image placement in this way, and consequently adjusting how much convergence our eyes experience when we look at the displayed image, the Smartglasses can make it seem like the image is being projected on a focal plane at a specific distance in front of you.
The pair of glasses I tried on, for example, were calibrated so that the displayed image was directly in my right eye’s line of sight when my eyes were converging on a focal plane about 1.3 meters in front of me, which is approximately the distance at which someone I was talking to might stand.
And of course, it’s easy to recalibrate the image’s placement for other tasks: if you’re riding your bike, you’d likely nudge the image to the right, so your eyes don’t have to converge as much when looking at the image, making it seem like it’s farther out in front of you and preserving your ability to focus on the world

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