Image Sensor Covering Film Air Gap Crosstalk Reduction
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Solution Overview
Problem
Current image sensors face challenges in achieving improved picture quality due to limitations in light transmission and crosstalk between pixels, which affect the overall performance in various applications.
Innovation Solution
The image sensor design incorporates a substrate with photoelectric elements, color filters, and a covering film with air gaps between the filters, which reduces light reflection and diffusion, enhancing picture quality by minimizing crosstalk between pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If color filters are placed adjacent to each other on the substrate, then the image sensor can capture color information, but light reflection and diffusion occur between adjacent filters causing crosstalk and degraded picture quality
Solution Approach 1:
A covering film is introduced as an intermediary material between adjacent color filters to prevent direct optical interaction. The covering film has a refractive index lower than both the color filters and the substrate, creating optical isolation that reduces reflection and diffusion of light between neighboring filters, thereby eliminating crosstalk while preserving color capture functionality
Solution Approach 2:
The refractive index parameter of the covering film is specifically selected to be lower than both the color filters and substrate. This parameter change creates optimal optical conditions by minimizing reflection at interfaces and reducing light diffusion, directly addressing the crosstalk problem while maintaining effective light transmission for color detection
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 improves picture quality by reducing light reflection and diffusion, thereby enhancing the performance of image sensors in applications such as digital cameras and surveillance systems.
Implementation Method 1
reduces light reflection and diffusion
Implementation Method 2
reduces light reflection and diffusion
Implementation Method 3
The PD converts incident light into an electrical signal
Data Source
AI summary
An image sensor and a method of fabricating the same are provided. The image sensor includes a substrate including photoelectric elements, a first color filter disposed on the substrate, a second color filter disposed on the substrate to be adjacent to the first color filter, a covering film disposed between sidewalls of the first and second color filters, and an air gap formed in the covering film.