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An image sensor and a method for reducing fixed image noise in image sensors

An image sensor and imaging technology, applied in the field of image sensors, can solve problems such as changes

Active Publication Date: 2019-05-28
思特威(上海)电子科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although fixed image noise does not change significantly during photon capture, it does vary with integration time, image sensor temperature, image sensor gain, and incident illumination

Method used

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  • An image sensor and a method for reducing fixed image noise in image sensors
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  • An image sensor and a method for reducing fixed image noise in image sensors

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Embodiment Construction

[0063] The above-mentioned figures illustrate the present invention, which is an image sensor including a pixel unit having a signal noise reduction element and a global shutter readout mode. The present invention discloses multiple embodiments of the image sensor. In the following description, numerous specific details are stated to facilitate a thorough understanding of the present invention. However, those skilled in the relevant fields should know that the technical content recorded in the present invention can be implemented without specific details or other methods, components, materials, etc. In other examples, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring specific content.

[0064] A substrate can have a front surface and a back surface. The execution of any machining process from the front can be regarded as a front operation, and the execution from the back can be regarded as a back operation. Structures or de...

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Abstract

An image sensor which has global shutter imaging pixel cells, each including an anti-blooming transistor gate for modifying electric charge within a photodiode and for setting the photodiode to a selected potential. The sensor also has a row decoder circuit providing readout signals to each row of the imaging cells during both a readout interval and during a calibration interval for each row and providing to the anti-blooming transistor drain a selectable potential supply voltage. A mode select switch within the row decoder circuit applies either a standard drain supply voltage or an adjustable low voltage to the anti-blooming transistor drain. A programmable function logic circuit determines the timing of operation of the mode select switch to provide knee-point calibration to minimize photo conversion variations that lead to fixed pattern noise.

Description

Technical field [0001] The invention relates to the technical field of image sensors, and in particular to a CMOS image sensor including a global shutter image pixel unit and an anti-halation gate circuit. The present invention provides an embodiment for reducing fixed image noise caused by differences between pixel units of an image sensor. The image sensor can be used in digital cameras. Background technique [0002] The image acquisition device generally includes an image sensor and a lens. The lens focuses light on the image sensor to form an image, and the image sensor converts the light signal into an electrical signal. The electrical signal is output from the image acquisition device to other components of the electronic system. The image acquisition device and other components of the electronic system constitute the imaging system. Image sensors have been widely used and can be seen in various electronic systems, such as mobile phones, digital cameras, medical equipme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/365H04N5/374H04N5/355
CPCH04N25/57H04N25/622H04N25/671H04N25/77H01L27/14656H04N25/59H04N25/75
Inventor 徐辰莫要武马伟剑邵泽旭
Owner 思特威(上海)电子科技股份有限公司
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