Rambus prototypes 2x2mm lens-less eye-tracker for headmount displays

At last week's VLSI Symposia, Rambus presented a poster titled

Jun. 23, 2016, Jun. 21, 2016 – 

The Lensless Smart Sensors (LSS) rely on a phase anti-symmetric diffraction grating (either tuned for optical or IR thermal sensing) mounted directly on top of a conventional imaging array and co-designed with computational algorithms that extract the relevant information from the scene to be imaged. The grating is very thin and boasts a wide field of view, up to 120 degree, and the resulting imaging sensor is almost flat (only a few hundred micrometres separate the grating from the image sensor).

The raw sensed image is encoded by the grating structure, calling for dedicated reconstruction algorithms and image processing, but in some applications such as range-finding or eye-tracking, it may not even be necessary to reconstruct a full image. Instead, extracting distance measurements may suffice and the particular phase anti-symmetric diffraction structure makes it very simple, explains the poster.

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