Optical Filter Layer Projections for Photodiode Alignment and Crosstalk
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Solution Overview
Problem
Positional misalignment between the optical filter layer and photodetection elements in detection devices leads to variations in light incidence, reducing detection accuracy.
Innovation Solution
A detection device with a first substrate featuring photodiodes and an optical filter layer having light-transmitting regions, a light-blocking region, and projections from the light-blocking region's surface, which are aligned to overlap photodiodes and reduce crosstalk, ensuring consistent light incidence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an optical filter layer is used to remove oblique light components, then detection accuracy is improved, but positional misalignment between the optical filter layer and photodetection elements causes variations in light incidence
Solution Approach 1:
A projection structure is introduced as an intermediary element that extends from the optical filter layer toward the photodetection elements. This projection serves as a physical mediator that guides and stabilizes the light path, ensuring consistent light incidence on the photodetection elements even when positional misalignment occurs during manufacturing. The projection effectively bridges the gap between the optical filter layer and photodetection elements, maintaining optical performance without requiring extremely tight manufacturing tolerances.
2Measurement precision
If photodetection elements are arranged closely to increase detection resolution, then detection precision is improved, but crosstalk between adjacent photodiodes increases
Solution Approach 1:
The projection structure extracts and isolates the light path for each photodetection element by creating physical separation between adjacent light paths. The projection extends into the space between adjacent photodiodes, effectively removing stray light and oblique components that would otherwise cause crosstalk. This allows photodetection elements to be arranged closely together while maintaining low crosstalk levels, as the projection acts as a light-blocking barrier between adjacent elements.
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 positional misalignment and variations in light incidence on photodiodes, enhancing detection accuracy and preventing crosstalk between adjacent photodiodes.
Implementation Method 1
a plurality of photodiodes provided on the first substrate
Implementation Method 2
an optical filter layer including a plurality of light-transmitting regions provided so as to overlap the respective photodiodes, a light-blocking region provided between the light-transmitting regions
Data Source
AI summary
According to an aspect, a detection device includes: a first substrate; a plurality of photodiodes provided on the first substrate; and an optical filter layer including a plurality of light-transmitting regions provided so as to overlap the respective photodiodes, a light-blocking region provided between the light-transmitting regions, and a projection projecting from a surface of the light-blocking region facing the first substrate.