Solid-State Image Sensor Light-Splitting Filter for Crosstalk
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Solution Overview
Problem
Traditional solid-state image sensors face challenges with strong scattering and crosstalk due to long wavelength light focusing on isolation structures, which affect image signal quality.
Innovation Solution
Incorporating a light-splitting structure within the color filter layer, separated from a grid structure, to reduce scattering and crosstalk by effectively managing light distribution between photoelectric conversion elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light enters the solid-state image sensor, then image signal is generated, but long wavelength light focuses on isolation structures causing strong scattering and crosstalk
Solution Approach 1:
The patent divides the color filter layer into multiple segments including a light-splitting structure segment and a grid structure segment. This segmentation allows different portions of the color filter layer to perform different functions: the light-splitting structure segment directs long wavelength light away from isolation structures, while the grid structure segment provides electrical isolation, collectively reducing scattering and crosstalk
Solution Approach 2:
The light-splitting structure acts as an intermediary element between the incident light and the isolation structures. It intercepts long wavelength light and redirects it before the light can reach the isolation structures, thereby preventing the harmful scattering and crosstalk that would otherwise occur
2Reliability
If traditional multi-PD structure is used, then photoelectric conversion is achieved, but scattering and crosstalk occur due to light focusing on isolation structures
Solution Approach 1:
The color filter layer is segmented into distinct functional regions including light-splitting structure, grid structure, and multiple color filter segments. This segmentation enables the light-splitting structure to specifically address long wavelength light management while maintaining the photoelectric conversion function of the multi-PD structure
Solution Approach 2:
The light-splitting structure is positioned at specific locations within the color filter layer where long wavelength light management is most critical. This local placement allows the structure to selectively redirect long wavelength light away from isolation structures without affecting the overall photoelectric conversion efficiency of the multi-PD structure
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The light-splitting structure improves image signal quality by minimizing scattering and crosstalk, enhancing the performance of solid-state image sensors.
Implementation Method 1
a light-splitting structure disposed in the color filter layer... effectively reduce scattering and crosstalk
Data Source
AI summary
A solid-state image sensor is provided. The solid-state image sensor includes photoelectric conversion elements and a color filter layer disposed above the photoelectric conversion elements. The color filter layer has a first color filter segment and a second color filter segment adjacent to the first color filter segment. The first color filter segment and the second color filter segment correspond to different colors. The solid-state image sensor further includes a light-splitting structure disposed in the first color filter segment or the second color filter segment and a grid structure disposed between the first color filter segment and the second color filter segment. The light-splitting structure is separated from the grid structure.