Optical Filter Layer Structure for Uniform Pinhole and Lens Shapes
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Solution Overview
Problem
In detection devices with stacked pinhole and lens arrays, shape variations in the pinholes and lenses due to a light-blocking layer on a light-transmitting resin layer lead to inconsistencies in light transmission, affecting detection accuracy.
Innovation Solution
A detection device configuration featuring a substrate with photodiodes, a first light-transmitting resin layer, a light-blocking layer with openings, a second light-transmitting resin layer, and lenses on top, where the second resin layer covers the peripheral end of the light-blocking layer, reducing shape variations and improving light transmission consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a light-blocking layer and lens are formed on a light-transmitting resin layer, then the optical filter structure is completed, but a step is formed at the peripheral end causing shape variations in pinholes and lenses
Solution Approach 1:
The light-transmitting resin layer is divided into multiple segments (first light-transmitting resin layer and second light-transmitting resin layer) with different coverage ranges. The first layer covers the detection region completely, while the second layer covers only the peripheral region where the step is formed, allowing each segment to serve its specific function without compromising the other.
Solution Approach 2:
Different regions of the light-transmitting resin layer are given different properties: the first light-transmitting resin layer provides complete coverage for the detection region, while the second light-transmitting resin layer provides additional coverage specifically at the peripheral region where steps are formed, addressing local shape variations without affecting the entire structure.
2Manufacturing precision
If the light-transmitting resin layer is extended to cover the peripheral side, then shape variations are reduced, but the device complexity increases
Solution Approach 1:
Instead of using a single extended light-transmitting resin layer, the structure is segmented into two distinct layers: the first light-transmitting resin layer that covers the detection region and the second light-transmitting resin layer that covers the peripheral region. This segmentation allows each layer to be optimized for its specific function while reducing overall structural complexity.
Solution Approach 2:
The second light-transmitting resin layer is specifically positioned to cover only the peripheral region where shape variations occur, providing localized correction without the need to extend the entire resin layer structure. This local approach reduces material usage and manufacturing complexity while achieving the desired shape consistency.
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
This configuration enhances detection accuracy by minimizing shape variations in the optical filter components, leading to improved light focusing and transmission stability.
Implementation Method 1
a plurality of lenses provided on the upper side of the second light-transmitting resin layer so as to overlap the respective photodiodes
Implementation Method 2
a light-blocking layer provided on the upper side of the first light-transmitting resin layer and provided with openings in regions overlapping the respective photodiodes
Implementation Method 3
a plurality of photodiodes provided in the detection region
Data Source
AI summary
According to an aspect, a detection device includes: a substrate having a detection region; a plurality of photodiodes provided in the detection region; a first light-transmitting resin layer provided so as to cover the photodiodes; a light-blocking layer provided on the upper side of the first light-transmitting resin layer and provided with openings in regions overlapping the respective photodiodes; a second light-transmitting resin layer provided so as to cover the light-blocking layer; and a plurality of lenses provided on the upper side of the second light-transmitting resin layer so as to overlap the respective photodiodes. The second light-transmitting resin layer is provided so as to cover an end on a peripheral side of the light-blocking layer on a peripheral side of the substrate.