Pixel Separation Layout for Low-Crosstalk Solid-State Imaging
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Solution Overview
Problem
Conventional solid-state imaging elements with pixel separating sections between all pixels reduce the volume of photoelectric conversion units, leading to decreased quantum efficiency.
Innovation Solution
A solid-state imaging element with pixel separating sections disposed only at pixel boundaries extending in the X direction, minimizing crosstalk between different pixel columns while maintaining quantum efficiency by using compound semiconductors for photoelectric conversion units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If pixel separating sections are formed between all pixels, then crosstalk is reduced, but the volume of photoelectric conversion units decreases and quantum efficiency is reduced
Solution Approach 1:
The patent applies local quality by making the pixel separating section selective rather than uniform across all pixel boundaries. Specifically, pixel separating sections are formed only at boundaries between pixel columns in the X direction, while omitting them at boundaries in the Y direction. This localized approach reduces crosstalk where it most affects wavelength separation (between columns) while preserving photoelectric conversion volume in regions where crosstalk is less problematic (between rows), thus resolving the contradiction between crosstalk reduction and quantum efficiency maintenance.
2Object-affected harmful factors
If pixel separating sections are formed between all pixels, then crosstalk is reduced, but the volume of photoelectric conversion units decreases
Solution Approach 1:
The patent implements local quality by differentiating the treatment of pixel boundaries based on their orientation. Pixel separating sections are strategically placed only at X-direction boundaries between pixel columns, while Y-direction boundaries between pixel rows within the same column lack these sections. This selective placement reduces crosstalk between columns (where it impacts wavelength separation) while maintaining larger photoelectric conversion unit volumes in Y-direction adjacent pixels, thereby resolving the contradiction between crosstalk reduction and volume preservation.
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 solution effectively reduces crosstalk and maintains quantum efficiency, improving wavelength separation and sensitivity by preventing signal charge leakage between pixel columns.
Implementation Method 1
a plurality of pixels arranged in a two-dimensional matrix in an X direction and a Y direction and including a photoelectric conversion unit containing a compound semiconductor
Data Source
AI summary
Provided is a solid-state imaging element with which it is possible to minimize crosstalk between different pixel columns while suppressing a decrease in quantum efficiency of a photoelectric conversion unit due to a pixel separating section. The solid-state imaging element includes a plurality of pixels arranged in a two-dimensional matrix in the X direction and the Y direction and including a photoelectric conversion unit (N-type semiconductor thin film) containing a compound semiconductor. In addition, the solid-state imaging element includes a pixel separating section disposed only at a pixel boundary extending in the X direction.