Opaque Dam Structure for Image Sensor Package UV Curing
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Solution Overview
Problem
Existing image sensor packages face issues with light scattering defects and incomplete adhesive curing due to the presence of wirebonds and pads, which can lead to corrosion and reliability problems, particularly with ultraviolet light curing processes.
Innovation Solution
Incorporating a colored additive in the dam between the image sensor die and the electromagnetic radiation transmissive cover, which makes the dam optically opaque to specific wavelengths of light, thereby blocking reflected radiation and allowing for even adhesive curing without the need for a black layer, thus preventing light scattering and corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional transparent dam structure is used between the image sensor die and the electromagnetic radiation transmissive cover, then the structure allows light transmission and maintains simplicity, but it causes light scattering defects and incomplete adhesive curing due to reflected radiation from wirebonds and pads
Solution Approach 1:
The patent applies a colored additive (such as carbon black, titanium dioxide, or other pigments) to the dam material to make it optically opaque to specific wavelengths of light. This color modification allows the dam to block reflected radiation from wirebonds and pads, preventing light scattering defects and enabling complete adhesive curing throughout the dam structure, thereby resolving the contradiction between curing completeness and structural simplicity.
2Reliability
If the dam is made optically opaque using a colored additive, then light scattering is blocked and adhesive curing is improved, but the dam structure becomes more complex
Solution Approach 1:
The patent creates a composite dam material by incorporating colored additives (such as carbon black, titanium dioxide, or other pigments) into the dam substrate material. This composite approach allows the dam to simultaneously maintain its structural function and provide optical opacity to block harmful reflected radiation, preventing corrosion of wirebonds and pads while curing the entire adhesive volume completely. The composite material solution addresses the contradiction by integrating multiple functions into a single material system.
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 blocks unwanted light wavelengths, ensuring complete adhesive curing and reducing light scattering defects, thereby enhancing the reliability and performance of image sensor packages by eliminating corrosion and voids in the bonding process.
Implementation Method 1
The colored additive may make the dam optically opaque to one or more wavelengths of electromagnetic radiation detected by the image sensor die
Data Source
AI summary
An image sensor package may include an image sensor die; an electromagnetic radiation transmissive cover coupled over the image sensor die; and a dam between the image sensor die and the electromagnetic radiation transmissive cover, the dam including a colored additive. The dam may form a space between the image sensor die and the electromagnetic radiation transmissive cover.