OPTICAL BLOCKING STRUCTURES FOR BLACK LEVEL CORRECTION PIXELS IN AN IMAGE SENSOR

An image sensor includes an array of image pixels and black level correction (BLC) pixels. Each BLC pixel includes a BLC pixel photodetector, a BLC pixel sensing circuit, and a BLC pixel optics assembly configured to block light that impinges onto the BLC pixel photodetector. Each BLC pixel optics a...

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Bibliographic Details
Main Authors HSIEH, Feng-Chien, CHEN, Hsin-Chi, CHENG, Yun-Wei, LEE, Kuo-Cheng
Format Patent
LanguageEnglish
Published 08.09.2022
Subjects
BASIC ELECTRIC ELEMENTS
ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
SEMICONDUCTOR DEVICES
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Summary:An image sensor includes an array of image pixels and black level correction (BLC) pixels. Each BLC pixel includes a BLC pixel photodetector, a BLC pixel sensing circuit, and a BLC pixel optics assembly configured to block light that impinges onto the BLC pixel photodetector. Each BLC pixel optics assembly may include a first portion of a layer stack including a vertically alternating sequence of first material layers having a first refractive index and second material layers having a second refractive index. Additionally or alternatively, each BLC pixel optics assembly may include a first portion of a layer stack including at least two metal layers, each having a respective wavelength sub-range having a greater reflectivity than another metal layer. Alternatively or additionally, each BLC pixel optics assembly may include an infrared blocking material layer that provides a higher absorption coefficient than color filter materials within image pixel optics assemblies.
Bibliography:Application Number: US202117191393