Image sensor and pixel reading method thereof

An image sensor and pixel technology, applied in image communication, TV, color TV components, etc., can solve the problems of insufficient image quality and image smear easily, and achieve the effect of eliminating noise

Active Publication Date: 2014-12-03
河北苏格医疗科技有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0011] The inventors of the present invention found that, in the prior art, the image sensor only includes one floating diffusion region, the captured image is prone to smear, and the image quality is not high enough

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  • Image sensor and pixel reading method thereof
  • Image sensor and pixel reading method thereof
  • Image sensor and pixel reading method thereof

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Embodiment Construction

[0036] In the following description, many technical details are proposed in order to enable readers to better understand the application. However, those skilled in the art can understand that without these technical details and various changes and modifications based on the following implementation modes, the technical solution claimed in each claim of the present application can be realized.

[0037] In order to make the purpose, technical solution and advantages of the present invention clearer, the following will further describe the implementation of the present invention in detail in conjunction with the accompanying drawings.

[0038] A first embodiment of the present invention relates to an image sensor. image 3 is a schematic diagram of the image sensor structure.

[0039] Specifically, as image 3 As shown, the image sensor includes: a controller, a light emitting diode LED and a plurality of pixel areas.

[0040] Each pixel area includes a first floating diffusio...

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Abstract

The invention relates to the technical field of semiconductors and discloses an image sensor and a pixel reading method thereof. A transmission tube and an integrated light-emitting diode (LED) structure are added on a traditional complementary metal oxide semiconductor (CMOS) image sensor and doped to form two floating diffusion areas which are used for obtaining images of an LED at luminance and non-luminance stages respectively and synthesizing the images, light details and dark details can be simultaneously obtained, and smearing can be reduced while dynamic ranges of the image sensor are broadened. Under the condition that the LED emits lights, signals are easy to saturate, the ratio of the luminance time of the LED is set to be smaller than 50%, or the trap capacity of a first floating diffusion area is enabled to be larger than that of a second floating diffusion area, so that the first floating diffusion area is not easy to saturate. By means of a correlated double sampling technology, the purpose of noise elimination can be achieved.

Description

technical field [0001] The invention relates to the technical field of semiconductors, in particular to a metal oxide semiconductor image sensor with a double floating diffusion region structure integrating light emitting diodes. Background technique [0002] As we all know, an image sensor is a semiconductor device that converts an optical image into an electrical signal. Image sensors can be roughly classified into charge-coupled device (Charge-Coupled Device, “CCD” for short) and complementary metal oxide semiconductor (Complementary Metal Oxide Semiconductor, “CMOS” for short) image sensors. [0003] Existing CMOS image sensors include CMOS digital-to-analog circuits and pixel unit circuit arrays. [0004] According to its readout method, the existing CMOS image sensors can be roughly divided into passive pixel sensor (Passive Pixel Sensor, referred to as "PPS"), active pixel sensor (Active Pixel Sensor, referred to as "APS") and digital pixel sensor There are three ty...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/355H04N5/357H04N5/374H01L27/146
Inventor 孙涛汪辉田犁方娜陈杰苗田乐
Owner 河北苏格医疗科技有限公司
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