Biometric Sensor Substrate With Via Channels For Field Shaping
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Solution Overview
Problem
The thickness and material of substrates in biometric sensing devices can lead to blurry images due to dispersed sensed fields, limiting the resolution of captured biometric data.
Innovation Solution
The substrate includes vias filled with conductive or dielectric materials that direct sensed fields towards the sensing area of the biometric sensing device, improving image clarity and resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a substrate is positioned above the biometric sensing device to protect it and serve as an input surface, then the device is protected and has a functional input surface, but the sensed fields disperse and spread out causing blurry images and limited resolution
Solution Approach 1:
The substrate is segmented by forming vias (channels) through it, dividing the continuous substrate into regions separated by these channels. This segmentation allows the sensed fields to be guided through specific paths defined by the vias, preventing dispersion while maintaining the substrate's protective function.
Solution Approach 2:
The vias filled with conductive or dielectric materials act as intermediaries that mediate between the sensed fields and the sensing area. These material-filled channels guide and direct the sensed fields, ensuring they reach the sensing area without dispersing through the substrate, thus improving image resolution while the substrate remains in place for protection.
2Strength
If the substrate thickness is increased to improve protection, then device protection is enhanced, but the resolution of captured images deteriorates due to field dispersion
Solution Approach 1:
By segmenting the substrate with vias, the patent creates defined pathways that constrain field dispersion. Even with increased substrate thickness for better protection, the segmented structure ensures fields are channeled effectively through the vias to the sensing area, maintaining resolution despite greater thickness.
Solution Approach 2:
The material-filled vias serve as intermediaries that bridge the gap between the thicker substrate and the sensing area. These channels compensate for the increased thickness by providing direct field pathways, allowing the substrate to be thicker for protection without sacrificing image resolution.
3Strength
If the substrate material is changed to improve protective properties, then device protection is enhanced, but field dispersion increases causing blurry images
Solution Approach 1:
The segmentation of the substrate into via-filled channels creates field-guiding structures that override the material's inherent field-dispersing properties. Regardless of the substrate material chosen for protection, the segmented via structure ensures fields are directed properly, allowing use of materials optimized for protection without sacrificing resolution.
Solution Approach 2:
The conductive or dielectric materials filling the vias act as intermediaries that compensate for unfavorable substrate material properties. These intermediary materials within the channels guide the sensed fields effectively, allowing the substrate material to be selected based on protective properties without compromising image quality.
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 field shaping channels formed by the material-filled vias enhance the resolution and clarity of biometric data capture, addressing the issue of blurry images caused by substrate thickness and material limitations.
Implementation Method 1
The vias may be filled with a conductive material, a dielectric material, or some vias can be filled with a conductive material while other vias are filled with a non-conductive or dielectric material
Implementation Method 2
The vias may be filled with a conductive material, a dielectric material, or some vias can be filled with a conductive material while other vias are filled with a non-conductive or dielectric material
Data Source
AI summary
An electronic device may include a biometric sensing device that has a sensing area, and a substrate positioned above the sensing area and/or the biometric sensing device. The substrate can include vias that are formed through at least a portion of the substrate. The vias can be positioned at least above the sensing area of the biometric sensing device. The vias may be filled with a conductive material or a dielectric material. Alternatively, some vias can be filled with a conductive material while other vias are filled with a non-conductive or dielectric material.