Pixel acquisition circuit and image sensor

Abstract

The invention discloses a pixel acquisition circuit and an image sensor. The image sensor comprises: a pixel acquisition circuit array comprising a plurality of pixel acquisition circuits; a global control unit which is coupled with the pixel acquisition circuit array through a global reset signal line and is suitable for resetting the pixel acquisition circuit array when the image sensor is powered on; a global time signal generation unit which is coupled with the pixel acquisition circuit array through a global time signal line and is suitable for generating a global time signal representing time information; and a reading unit which is coupled with the pixel acquisition circuit array through a row selection line, a row event reset signal line, a column flag bit signal line and a column time signal line, and is suitable for reading event information of the event sequence generated by the pixel acquisition circuit array.

Description

technical field [0001] The present invention relates to the technical field of image sensors, in particular to a novel image sensor. Background technique [0002] Among the many application fields of image sensors, the detection of moving objects is one of the important aspects. In this application field, compared with traditional image sensors (such as active pixel sensors), dynamic vision image sensors (hereinafter referred to as dynamic vision sensors) have gradually attracted people's attention due to their unique advantages. [0003] Based on the pixel unit (or pixel acquisition circuit) designed based on the bionic principle, the dynamic vision sensor can continuously respond to the light intensity changes in the field of view in real time without any exposure time, which makes it easier to detect high-speed motion object. In addition, because the dynamic vision sensor only responds to and outputs the position information of the pixel unit corresponding to the area w...

AI Technical Summary

Problems solved by technology

For some high-speed motion detection, the movement speed of the object is very fast, which is reflected in the rapid change of light intensity in the field of view, and the existence of readout delay causes the pixel unit to fail to respond to this rapid change, thus missing the output of some events

On the other hand, due to the gradual increase in the resolution of the dynamic vision sensor, the transmission delay of the internal wiring of the chip is also increasing, which fundamentally limits the speed at which the dynamic vision sensor processes and reads out events, thereby increasing the number of events. readout delay

Therefore, the event information output by the dynamic vision sensor cannot accurately restore the real motion information, especially for high-speed motion

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