A 0.35-μm subthreshold CMOS ASIC for a Smart Contact Lens Eye-Tracker
Résumé
This paper describes a camera-less eye-tracker using an instrumented contact lens fitted with photodetectors and illuminated by eyewear. The gaze direction is computed on the lens using the photo-currents by means of a mixed signal 0.35−μm CMOS ASIC. NFC is used to power the ASIC and to transmit the gaze direction to the eyewear. Experimental measurements are performed using a prototype scleral contact lens mounted on a mock-up eye. The measurements show that an accuracy of 0.2∘ is achievable, i.e. 2.5 times better than current mobile video-based eye-trackers, for a power consumption of 170 μW. Several tests were carried out on several ASICs, demonstrating system reliability despite process variations, operating time, and supply voltage variations.
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Massin et al. - 2022 - A 0.35-µm subthreshold CMOS ASIC for a Smart Conta.pdf (1.96 Mo)
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