Optical Substrate Light-Shielding Film for Flare and Ghosting Reduction
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Solution Overview
Problem
Existing solid-state imaging device packages face challenges in reducing noise such as flare and ghosting due to unintended light reflection, particularly with the use of light-shielding materials that risk adhering to optical paths and deteriorating image quality.
Innovation Solution
An optical substrate with a light-shielding film formed from a photocurable resin composition containing a coloring agent, featuring a negative skewness and controlled roughness, is used to suppress noise by diffusing and scattering unintended light, with a frame having an inner diameter larger than the optical path opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a black resin pattern is formed on the transparent substrate to suppress unintended light reflection, then noise such as flare and ghosting is reduced, but pigment or contaminants may adhere to the optical path region, deteriorating image quality
Solution Approach 1:
The patent extracts the light-shielding function from the black resin pattern and implements it through a light-shielding film with specific optical properties. The light-shielding film is positioned at a distance from the optical path and has controlled optical characteristics that prevent pigment adhesion while maintaining light-shielding effectiveness, thus separating the light-shielding function from the problematic black resin layer.
Solution Approach 2:
The light-shielding film acts as an intermediary between the transparent substrate and the unwanted light. It is positioned at a specific distance from the optical path and has controlled optical properties (transmission ratio of 5-50% in specific wavelength ranges) to intercept and block unintended light without allowing pigment or contaminants to adhere to the optical path region.
2Object-affected harmful factors
If a light-shielding material is provided in the peripheral region to block unintended light, then flare and ghosting are reduced, but the complexity of the package structure increases
Solution Approach 1:
The patent merges the light-shielding function with the existing transparent substrate by forming a light-shielding film directly on its surface. This integration eliminates the need for separate peripheral light-shielding structures and complex assembly processes, reducing overall package structure complexity while maintaining effective light-shielding performance.
Solution Approach 2:
The light-shielding film is implemented as a thin film structure with controlled thickness and optical properties. This thin film approach provides effective light-shielding functionality while minimizing added complexity compared to rigid peripheral structures or thick light-shielding materials.
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 image noise by minimizing regular reflection and ghosting, while maintaining high image quality by preventing pigment adherence to the optical path, thus enhancing the S/N ratio and image clarity.
Implementation Method 1
a light-shielding film formed from a photocurable resin composition containing a coloring agent, laminated on one principal surface of the transparent substrate... effectively reduces image noise by minimizing regular reflection and ghosting
Implementation Method 2
suppress noise by diffusing and scattering unintended light
Implementation Method 3
a light-shielding film formed from a photocurable resin composition
Data Source
AI summary
An optical substrate can reduce noise in a captured image of a solid state imaging device package. The optical substrate includes a transparent substrate and a light-shielding film that is formed from a photo-curable resin composition including a colorant. The light-shielding film is stacked on one principal surface of the transparent substrate, and has a light path opening. The skewness Ssk of a surface of the light-shielding film on the side opposite the transparent substrate is a negative value.