"The telescreen received and transmitted simultaneously. Any sound that Winston made, above the level of a very low whisper, would be picked up by it; moreover, so long as he remained within the field of vision which the metal plaque commanded, he could be seen as well as heard. There was of course no way of knowing whether you were being watched at any given moment." — from 1984
ETH Zurich researchers unveil a "Fourier pixel"
Researchers from ETH Zurich in Switzerland have created a new type of pixel that can simultaneously act as a display and a sensor, the team reported. The group calls the innovation a Fourier pixel; the source describes it as a "hypercharged pixel" that can "generate and sense arbitrary light fields."
What the Fourier pixel can do: intensity, phase, polarization
According to the published description, the Fourier pixel taps into "a pixel’s full potential for carrying information" by manipulating several properties of light. Specifically, the pixel can control and detect light's intensity, oscillation phases, and polarization. That combination — arbitrary light-field generation together with sensing — is presented as the core technical advance.
Simultaneous display-and-capture: the technical and perceptual shift
The defining characteristic reported is simultaneity: unlike conventional pixels that are either part of a display or part of an image sensor, a Fourier pixel is described as capable of both functions at once. The source frames this capability as moving toward what it calls "1984 technology," invoking a well-known fictional telescreen that received and transmitted simultaneously. The comparison highlights the perceptual shift implied by a surface that both shows imagery and can observe the environment.
Findings published in Nature
The ETH Zurich team "reported its findings in a paper published yesterday in Nature." The characterization in the source emphasizes the peer-reviewed venue as the forum for the disclosure of the Fourier pixel concept and its demonstrated properties.
What this means for technologists, policymakers, and end users
- Technologists and security teams: The pixel's ability to both generate and sense "arbitrary light fields" and to manipulate intensity, phase, and polarization gives engineers new degrees of freedom for imaging, display design, and optical communications. Those exact capabilities — simultaneous generation and sensing plus multi-parameter light control — are the technical elements that experts will evaluate for practical implementations.
- Policymakers and regulators: The source explicitly draws a parallel to a device that can both display and record, invoking 1984's telescreen. Policymakers will therefore be presented with a clear conceptual framing: a surface sold as a display may, in principle, have sensing capability built into the same pixel architecture.
- End users and the general public: The reported capability — a pixel that can "generate and sense" light fields — reframes ordinary screens as potential dual-use devices. The public conversation will likely center on whether and how such sensing is enabled, disclosed, or constrained.
The record in the source is compact but direct: a Swiss research team has described a pixel that simultaneously emits and detects light and that exploits intensity, phase, and polarization to carry information. That combination is what moves the idea from a laboratory curiosity toward something that maps onto long-standing privacy and security imaginations — hence the deliberate citation of 1984. The next concrete step identified by the source is the paper itself, published yesterday in Nature; beyond that, the advance raises the practical and ethical question the source leaves plainly visible: what will happen when pixels on our walls, phones, or public displays can do both what a camera does and what a screen does at the same time?
https://www.schneier.com/blog/archives/2026/07/a-video-screen-that-is-also-a-camera.html
