Insulating Substrate Edge Porosity for Image Sensor Light Noise
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Solution Overview
Problem
Miniaturization and thinning of electronic devices lead to light transmission through the circumferential edge of the board openings, causing noise in image reception by the imaging element.
Innovation Solution
An electronic element mounting board with an insulating substrate having a lower porosity at the circumferential edge of the opening, reducing light transmission and noise by minimizing voids and using a black substrate for additional light absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the board is thinned to achieve miniaturization, then the device size is reduced, but light transmits through the circumferential edge part of the opening causing noise
Solution Approach 1:
The insulating substrate is designed with non-uniform porosity distribution: the circumferential edge part has lower porosity (higher density) to block light, while the inner part maintains higher porosity for other functional requirements. This local differentiation of material properties allows the thin board to simultaneously achieve miniaturization and light blocking performance.
Solution Approach 2:
The porosity parameter of the insulating substrate is changed specifically in the circumferential edge region. By controlling the porosity to be lower at the edges compared to the center, the material's light transmission properties are modified locally, enabling the thin board structure to prevent light leakage while maintaining overall device miniaturization.
2Object-affected harmful factors
If the porosity is reduced at the circumferential edge to block light, then light transmission is suppressed, but the manufacturing complexity increases
Solution Approach 1:
The manufacturing process targets specific local regions (circumferential edges) for porosity control rather than treating the entire substrate uniformly. This localized approach allows standard manufacturing techniques to be applied with region-specific parameter adjustments, making the process manageable despite the complexity of creating non-uniform porosity distribution.
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 reduced porosity at the circumferential edge effectively suppresses light transmission, thereby lowering image noise and enhancing image quality.
Implementation Method 1
at least a part of the circumferential edge part of the opening has a porosity lower than a porosity of a portion outside the circumferential edge part in the insulating substrate... suppress transmission of incident light... by minimizing voids and using a black substrate for additional light absorption
Data Source
AI summary
There are provided an electronic element mounting board and an electronic device capable of suppressing transmission of incident light to an electronic device through a circumferential edge part of an opening of a board and thus of reducing a noise level in receiving an image. An electronic element mounting board includes an insulating substrate. The insulating substrate has an opening and a lower surface, and an electronic element is disposed on the lower surface so as to overlap the opening in a plan view. A circumferential edge part of the opening of the insulating substrate has a porosity lower than a porosity of a portion outside the circumferential edge part. Since it is possible to suppress transmission of incident light to the electronic element through the circumferential edge part, it is possible to reduce a noise level in receiving an image in the electronic element.