- A new type of pixel is capable of both controlling and analyzing light
- It's based on the Fourier mathematical tool
- We'll have to wait some time to get this in our gadget screens
Screens that double up as cameras could be packed into future gadgets, as researchers from ETH Zurich in Switzerland have developed a new type of pixel that can analyze and create images simultaneously.
These bidirectional pixels are able to both control and read the intensity, oscillation, phase, and polarization of light, and they're based on the fundamental physics of interfering light waves. The pixels are carefully sculpted at the nanometer level to direct light as it hits the surface and gets scattered.
At the same time as the light is traveling across the pixel and being scattered back out to the viewer, creating the required images and patterns, an analysis of the incoming light can be carried out as well — all on the same pixel.
The approach "establishes a scalable, universal architecture for vectorially programmable pixels with applications in adaptive optics, holographic displays, optical communication, and quantum information processing," write the researchers in their paper on the new pixel, which is published in Nature.
Scaling up
The pixel is termed a Fourier pixel after the mathematical tool that the component is based on. It's essentially a way of breaking down a complex output signal into a series of waves that can be controlled more easily — like the light fields here.
It's still early days for the research, and there will be challenges scaling this up. Right now the pixels need laser light as a source, and are fixed in what they can display — this isn't like a TV screen that can show anything, although there are several potential routes through which the tech could be developed in that direction.
The reactions on Reddit are perhaps a sign of our current technology times, as people have instantly latched on to the surveillance potential. "Screens that are also cameras, what could go wrong?" reads one poster, while another says that "I ain't ever buying a device with that technology". Fans of dystopian sci-fi have also been inspired to quote sections from 1984 about 'telescreens', which were two-way televisions and security cameras used to monitor citizens.
Interesting related piece of tech history of the day: the term 'pixel', originally 'picture element', was used in print for the first time in 1927, so next year marks a century since the words (now word) were originally introduced.
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