Segmented Light-Blocking Layer for Crosstalk Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In detection devices, crosstalk occurs due to oblique light entering other photosensors, leading to image blurring and reduced detection accuracy, and the light-blocking layer's thermal shrinkage causes shape defects such as asperities or wrinkles.
Innovation Solution
A detection device with a substrate, photodiodes, a protective film, overlapping lenses, a first light-blocking layer with openings, and a second light-blocking layer that is continuous across adjacent photodiodes, with slits between photodiodes to reduce stress and prevent shape defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a light-blocking layer is provided to cover the photosensor array to prevent crosstalk, then detection accuracy is improved, but shape defects such as asperities or wrinkles occur due to thermal shrinkage
Solution Approach 1:
The first light-blocking layer is divided into multiple independent light-blocking regions, each corresponding to a photosensor. This segmentation allows each region to independently accommodate thermal shrinkage without causing wrinkles or asperities across the entire layer, while still effectively blocking oblique light from adjacent photosensors.
Solution Approach 2:
The light-blocking structure transitions from a uniform continuous layer to a non-uniform segmented structure where each light-blocking region has localized properties. The regions are positioned to provide optimal light blocking for each photosensor while accommodating local thermal stress variations, preventing shape defects while maintaining detection accuracy.
2Ease of manufacture
If a continuous light-blocking layer is used to cover all photosensors, then manufacturing is simplified, but thermal shrinkage causes asperities and wrinkles
Solution Approach 1:
The continuous light-blocking layer is segmented into multiple discrete light-blocking regions. While this increases structural complexity, it eliminates the thermal shrinkage-induced defects that would require additional manufacturing steps to correct, thereby improving overall manufacturing quality and reducing rework.
3Object-affected harmful factors
If the light-blocking layer covers the entire array substrate, then crosstalk is prevented, but thermal expansion differences cause shape defects
Solution Approach 1:
The light-blocking layer is segmented into independent regions that can expand and contract independently with thermal changes. This segmentation prevents the propagation of thermal stress across the entire array, eliminating shape defects while maintaining effective crosstalk prevention through proper positioning of each segment.
Solution Approach 2:
The light-blocking regions act as intermediary structures between the photosensors and the incoming light. By positioning these regions specifically to block oblique light paths while leaving gaps or using separate regions, they prevent crosstalk without requiring continuous coverage that would cause thermal expansion issues.
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 blocks oblique light, reducing crosstalk and improving detection accuracy while minimizing shape defects in the light-blocking layer by allowing for thermal expansion without causing wrinkles or asperities.
Implementation Method 1
a first light-blocking layer that is provided between the photodiodes and the lenses and is provided with first openings in regions overlapping the respective photodiodes; and a second light-blocking layer that is provided between the first light-blocking layer and the lenses
Implementation Method 2
a first light-blocking layer that is provided between the photodiodes and the lenses and is provided with first openings in regions overlapping the respective photodiodes; and a second light-blocking layer that is provided between the first light-blocking layer and the lenses and is provided with second openings in regions overlapping the respective photodiodes and the respective first openings. The first light-blocking layer is provided with slits in regions overlapping gaps between the photodiodes adjacent to each other
Data Source
AI summary
According to an aspect, a detection device includes: a substrate; a plurality of photodiodes arranged on the substrate; a protective film that covers the photodiodes; a plurality of lenses provided so as to overlap the respective photodiodes; a first light-blocking layer that is provided between the photodiodes and the lenses and is provided with first openings in regions overlapping the respective photodiodes; and a second light-blocking layer that is provided between the first light-blocking layer and the lenses and is provided with second openings in regions overlapping the respective photodiodes and the respective first openings. The first light-blocking layer is provided with slits in regions overlapping gaps between the photodiodes adjacent to each other, and the second light-blocking layer is provided so as to be continuous across the photodiodes adjacent to each other and is provided so as to overlap the slits.