Interleaved time-sharing readout method of pixel signals of high frame rate area array image sensor

Abstract

The invention relates to a method for interleaved time-sharing readout of pixel signals of a high-frame-frequency area array image sensor. The method is as follows: two address pointers are used in a row selection channel; Control branch; the first readout control branch is composed of the first storage capacitor C1 and the first branch switch S1 in series; the second readout control branch is composed of the second storage capacitor C2 and the second branch switch S2 in series; through the address The pointer <1> controls the timing of the reset switch and the transfer control switch of each row of pixels, and the address pointer <2> controls the timing of the row selection switch of each row of pixels, and transfers the charge of the photodiode PD of the pixel, clears the storage node FD, and clears the photodiode PD. to different travel times. The present invention shortens the overall line time. The readout of the pixel signal of the area array image sensor with a high frame rate can be realized without paying the price of increased power consumption and decreased precision.

Description

technical field [0001] The invention belongs to the technical field of area array image sensors, and relates to a method for reading out pixel signals of an area array image sensor, in particular to a method for interleaved time-sharing readout of pixel signals of an area array image sensor with a high frame frequency. Background technique [0002] With the rapid development of machine vision, mobile communication, artificial intelligence and other fields, image sensors, as an integral part of them, play a very important role. [0003] There is only one address pointer in the row selection circuit of the conventional area array image sensor, and only one readout control branch composed of the first storage capacitor C1 is included in the amplifying circuit; the reset switch, the transfer control switch, the source stage of the pixel are controlled by the address pointer The gate voltage of the amplifier and the row select switch, so as to realize the exposure of the pixel an...

AI Technical Summary

Problems solved by technology

[0005] The above pixel signal readout method, analog amplification and sampling is no problem when the line time is sufficient, but with the increase of the frame rate, the line time is shortened, and the charge transfer and clearing time in the photodiode PD cannot be compressed, so the It can only be considered to reduce the establishment time of reset analog signal and optical analog signal (such as figure 2 shown in ① and ② area)

However, reducing the settling time of analog signals is limited, and it requires paying the price of increased power consumption and decreased accuracy.

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