Surprise your friends, avoid your enemies. Assembly of the invisibility shield takes just ten minutes.
Each shield uses a precision engineered lens array to direct much of the light reflected from the subject away from the observer, sending it sideways across the face of the shield to the left and right.
https://www.kickstarter.com/projects/invisibility-shield/invisibility-shield
Because the lenses in this array are vertically oriented, the vertically oriented strip of light reflected by the standing/crouching subject quickly becomes very diffuse when spread out horizontally on passing through the back of the shield.
In contrast, the light reflected from the background is much brighter and wider, so when it passes through the back of the shield, far more of it is refracted both across the shield and towards the observer.
From the observer’s perspective, this background light is effectively smeared horizontally across the front face of the shield, over the area where the subject would ordinarily be seen.
The top down cross section (below) picturing one of the shield’s lenses shows that much of the light entering the back of the shield is refracted to a focal point and then spread out to the sides from there. However, when the outer surface of the lens reaches a sufficiently shallow angle relative to the angle of the incoming light ray, the light is reflected internally, rather than refracted out. It is then diffused, reflected and refracted around and out of the lens where it can also interact with the lenses on either side.
source Kickstarter
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