Modulation Layer for Solid-State Image Sensor Petal Flare Reduction
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Solution Overview
Problem
Traditional solid-state image sensors suffer from grating diffraction issues, leading to color dispersion and ghost images due to surface diffraction, which affect image quality.
Innovation Solution
A modulation layer with multiple sub-layers of different refractive indexes is introduced above the photoelectric conversion elements, forming a mosaic pattern that causes phase modulation to prevent surface diffraction, thereby improving image signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a traditional solid-state image sensor structure is used, then the device complexity is low, but surface diffraction causes color dispersion and ghost images degrading image quality
Solution Approach 1:
The modulation layer is divided into multiple sub-layers (first sub-layer, second sub-layer, etc.) with different refractive indexes, where each sub-layer occupies specific modulation segments. This segmentation allows the layer to modulate light phase effectively while preventing surface diffraction, resolving the contradiction between reducing harmful diffraction effects and maintaining manageable device complexity.
Solution Approach 2:
The modulation layer uses composite material structure with multiple sub-layers having different refractive indexes arranged in specific patterns. This composite structure enables effective phase modulation to prevent surface diffraction while maintaining reasonable device complexity through systematic material arrangement.
2Manufacturing precision
If a modulation layer with multiple sub-layers is added to prevent surface diffraction, then image quality improves, but the device complexity increases
Solution Approach 1:
Different sub-layers are positioned in specific modulation segments with particular arrangements (e.g., first sub-layer in first group of segments, second sub-layer in second group of segments). This local quality differentiation enables precise phase modulation in different regions, improving image signal quality while managing device complexity through localized structural optimization.
Solution Approach 2:
The modulation layer introduces a new dimensional aspect to light control by using vertical stacking of multiple sub-layers with different refractive indexes, rather than relying solely on horizontal structures. This dimensional approach enables effective phase modulation to prevent surface diffraction while maintaining reasonable device complexity.
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 modulation layer effectively reduces surface diffraction, enhancing the quality of the image signal by preventing color dispersion and ghost images in solid-state image sensors.
Implementation Method 1
the modulation layer has a plurality of modulation segments. The modulation layer includes a plurality of first sub-layers and a plurality of second sub-layers having different refractive indexes. From the top view of the modulation layer, the modulation segments form a first group and a second group that is adjacent to the first group. The arrangement of the first sub-layers and the second sub-layers in the first group is different from the arrangement of the first sub-layers and the second sub-layers in the second group.
Implementation Method 2
The modulation layer includes a plurality of first sub-layers and a plurality of second sub-layers having different refractive indexes
Data Source
AI summary
A solid-state image sensor is provided. The solid-state image sensor includes a plurality of photoelectric conversion elements. The solid-state image sensor also includes a modulation layer disposed above the photoelectric conversion elements, and the modulation layer has a plurality of modulation segments. The modulation layer includes a plurality of first sub-layers and a plurality of second sub-layers having different refractive indexes. From the top view of the modulation layer, the modulation segments form a first group and a second group, and the second group is adjacent to the first group. The arrangement of the first sub-layers and the second sub-layers in the first group is different from the arrangement of the first sub-layers and the second sub-layers in the second group.