Image sensor and method for eliminating power supply noises of image sensor

Abstract

The invention provides an image sensor and a method for eliminating power supply noises of the image sensor. The image sensor comprises a pixel array, a noise acquisition circuit, a pixel unit signal output circuit and a noise removing circuit, wherein each row of the pixel array comprises standard pixel units and non-daylighting dark pixel units; the noise acquisition circuit is used for obtaining power supply noise differences by utilizing power supply signals which are acquired by the dark pixel units for the first time and the second time and superposed with the power supply noises; the pixel unit signal output circuit is used for obtaining photo-converted electric signals superposed with the power supply noise differences by utilizing the power supply signals which are acquired for the first time by the standard pixel units and superposed with the power supply noises and photo-converted electric signals which are acquired for the second time by the standard pixel units and superposed with the power supply noises and the power supply signals; and the noise removing circuit is used for removing the power supply noise differences from the photo-converted electric signals superposed with the power supply noise differences, thereby improving the image displaying quality of the image sensor.

Description

technical field [0001] The invention relates to the field of image processing, in particular to an image sensor and a method for eliminating power supply noise of the image sensor. Background technique [0002] CMOS image sensing technology is a technology based on CMOS technology, which has developed rapidly in the past ten years. CMOS image sensors collect, transmit, process and output images through integrated analog and digital circuits. Compared with other types of image sensing technologies, this technology has the advantages of high integration, low power consumption, low cost, and powerful functions. It is a technology with broad prospects. [0003] figure 1 It is a structural schematic diagram of an existing image sensor. Existing image sensors such as figure 1 As shown, it includes a pixel array 10 , a re-sampling circuit 20 and an analog-to-digital conversion circuit 30 . Wherein, the pixel array 10 has standard pixel units 11 arranged in an array, and the st...

AI Technical Summary

Problems solved by technology

However, the above methods can only eliminate some common noises in the first sampling and the second sampling, but cannot completely solve the noise problem.

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