Infrared Pixel Filter Using Organic Resin for Angle-Stable Detection
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Solution Overview
Problem
The existing light detection elements using dielectric multilayer filters suffer from reduced detection accuracy of infrared light due to changes in wavelength with varying incident angles, leading to deteriorated performance.
Innovation Solution
A light detection element with a substrate having multiple light reception units and a filter that cuts visible light while transmitting infrared light, formed over adjacent pixels, reducing wavelength changes and incorporating an organic resin composition with color materials to enhance infrared transmission and reduce visible light reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a dielectric multilayer film with different refractive indexes is stacked to cut visible light and transmit infrared light, then the filter can achieve wavelength selection, but the transmitted wavelength changes depending on the incident angle of light
Solution Approach 1:
The patent changes the material parameter from inorganic dielectric layers to an organic resin composition containing color materials. This material substitution fundamentally alters the optical properties, making the filter's transmitted wavelength insensitive to incident angle variations. The organic resin with dispersed color materials provides stable wavelength transmission regardless of light incidence angle, thereby resolving the contradiction between detection accuracy and wavelength stability.
Solution Approach 2:
The patent employs a composite material structure consisting of an organic resin composition with dispersed color materials. This composite approach combines the light-blocking properties of color materials with the transparent matrix of organic resin, creating a filter that effectively cuts visible light while transmitting infrared light with minimal wavelength variation across different incident angles.
2Object-affected harmful factors
If the filter is formed on the entire substrate including dummy pixel region and light-shielded pixel region, then visible light reflection from these regions is reduced, but the manufacturing complexity increases
Solution Approach 1:
The patent applies the filter across the entire substrate surface, making it serve multiple functions simultaneously: it cuts visible light from effective pixels, blocks visible light reaching dummy pixels, prevents visible light reflection from dummy and light-shielded regions, and maintains infrared transmission throughout. This universal application of a single filter layer eliminates the need for separate filters for different pixel regions, simplifying the overall device structure while achieving multiple optical control objectives.
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 improves infrared light detection accuracy by minimizing wavelength changes and reducing visible light interference, thereby enhancing the overall performance of the light detection element.
Implementation Method 1
a filter formed over a plurality of adjacent pixels on the substrate, the filter that cuts visible light and transmits infrared light
Implementation Method 2
an organic resin composition in which a color material that cuts the visible light is dispersed in an organic resin
Implementation Method 3
a microlens formed on the substrate, the microlens that condenses light on the light reception unit
Implementation Method 4
the microlens that condenses light on the light reception unit
Data Source
AI summary
A light detection element includes a substrate on which a plurality of light reception units is arranged in pixel units, and a filter formed over a plurality of adjacent pixels on the substrate, the filter that cuts visible light and transmits infrared light.