A 25. 3 <inline-formula> <tex-math notation="LaTeX">$\mu$ </tex-math> </inline-formula>W at 60 fps <inline-formula> <tex-math notation="LaTeX">$240 \times 160$ </tex-math> </inline-formula> Pixel Vision Sensor for Motion Capturing With In-Pixel Nonvolatile Analog Memory Using CAAC-IGZO FET

Abstract

Utilizing a c-axis-aligned crystalline oxide semiconductor-based FET, we have fabricated a vision sensor with in-pixel nonvolatile analog memory. The sensor realized normal image data capturing, captured differential data of a given reference frame, and retained the captured data for an extended time in each pixel. Moreover, the sensor realized normal global shutter image capturing and motion capturing by extracting differential images. This is performed using the captured data and depends on the presence or absence of differences between normal images and reference images. The sensor has three operating modes: an imaging mode, a motion capturing mode, and a wait mode. Importantly, power consumption is reduced by powering off circuit blocks that are in a standby state.