Image sensor pixel structure

Abstract

An image sensor pixel structure is suitable for obtaining N frames of images of the same scene in the same exposure process so as to fuse the obtained N frames of images into one frame of image, and Nis a positive integer and is larger than or equal to 3. The image sensor pixel structure comprises a photoelectric conversion circuit, a transmission circuit, a first charge storage circuit, at leastone second charge storage circuit and a reset circuit, wherein the at least one second charge storage circuit is sequentially connected in series; the first second charge storage circuit is coupled with the first charge storage circuit; and the at least one second charge storage circuit is suitable for respectively storing charges corresponding to the third frame of image to the Nth frame of image in the exposure process. By applying the scheme, the dynamic range of the image sensor can be improved, the signal-to-noise ratio of a dark place of a fused image can be higher, and the image quality is better.

Description

technical field [0001] The invention relates to the field of semiconductor manufacturing, in particular to an image sensor pixel structure. Background technique [0002] An image sensor is a semiconductor device that converts light signals into electrical signals. [0003] Image sensors are classified into complementary metal oxide (Complementary Metal Oxide Semiconductor, CMOS) image sensors and charge coupled device (Charge Coupled Device, CCD) image sensors. Among them, the CMOS image sensor has the advantages of simple process, easy integration of other devices, small size, light weight, low power consumption and low cost. Therefore, with the development of image sensing technology, CMOS image sensors are increasingly used in various electronic products instead of CCD image sensors. At present, CMOS image sensors have been widely used in still digital cameras, digital video cameras, medical imaging devices, and automotive imaging devices. [0004] However, the perform...

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Problems solved by technology

[0004] However, the performance of existing CMOS image sensors still needs to be improved

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