Pixel Array Layout With Light Shielding for Compact Image Sensors
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Solution Overview
Problem
There is a demand for reducing the size of imaging devices in the in-plane directions without compromising their operational capabilities, particularly in solid-state imaging devices where light leakage between pixels of different colors leads to inefficiencies and color mixing.
Innovation Solution
The implementation of a solid-state imaging device configuration that includes a pixel array unit with first and second color pixels, a first inter-identical color pixel wall member with a refractive index lower than the first color filter, and an inter-pixel light shielding film to suppress light leakage between pixels, enhancing light entry and sensitivity while preventing color mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the size of the imaging device is reduced in in-plane directions, then the device becomes more compact and suitable for modern applications, but light leakage between adjacent pixels increases causing color mixing and reduced image quality
Solution Approach 1:
The patent introduces an inter-pixel light shielding film as an intermediary structure positioned between adjacent pixels of different colors. This film acts as a mediator that blocks light leakage from one pixel to another without occupying significant space. The light shielding film is integrated into the pixel wall structure, creating a compact solution that prevents color mixing while maintaining small device dimensions.
Solution Approach 2:
The patent applies different refractive index characteristics to different regions: the inter-identical color pixel wall member has a refractive index lower than the color filter to guide light efficiently, while the inter-pixel light shielding film has light-blocking properties. This localized differentiation of optical properties allows the structure to simultaneously achieve compact size, efficient light guidance, and effective light leakage prevention.
2Use of energy by moving object
If the refractive index of the pixel wall member is lowered to improve light entry efficiency, then more light enters the photoelectric conversion unit, but light may leak to adjacent pixels of different colors
Solution Approach 1:
The patent divides the pixel wall structure into two distinct segments: the inter-identical color pixel wall member with low refractive index for light guidance, and the inter-pixel light shielding film with light-blocking properties. This segmentation allows each component to perform its specific function - one optimizes light entry while the other prevents color mixing - without compromising the overall system performance.
3Manufacturing precision
If light shielding structures are added between pixels to prevent color mixing, then image quality improves, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent merges the light shielding function with the existing pixel wall structure. The inter-pixel light shielding film is integrated into the pixel separation architecture, combining structural support and light blocking functions in a unified design. This integration reduces the number of separate components and simplifies the manufacturing process while maintaining effective prevention of color mixing.
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
This configuration allows for efficient light capture and improved sensitivity of the imaging device, enabling a reduction in size without sacrificing operational capability by minimizing light leakage and color mixing.
Implementation Method 1
The first inter-identical color pixel wall member is positioned in a gap among a plurality of the first color filters, and has a refractive index lower than a refractive index of the first color filter
Implementation Method 2
The inter-pixel light shielding film is positioned in a gap between the plurality of first color pixels and the plurality of second color pixels, and suppresses light entering and passing through the pixel array unit
Implementation Method 3
a first photoelectric conversion unit that receives first color light passed through the first color filter and performs photoelectric conversion on the first color light
Data Source
AI summary
An imaging device that makes it possible to achieve a reduction in size in in-plane directions without sacrificing its operation capability is provided. The imaging device includes: a base body; a pixel array unit; a first inter-identical color pixel wall member; and an inter-pixel light shielding film. The pixel array unit is one where a plurality of first color pixels and a plurality of second color pixels are disposed on the base body. The plurality of first color pixels lie adjacent to each other and each include a first color filter and a first photoelectric conversion unit that receives first color light passed through the first color filter and performs photoelectric conversion on the first color light. The plurality of second color pixels lie adjacent to each other and each include a second color filter and a second photoelectric conversion unit that receives second color light passed through the second color filter and performs photoelectric conversion on the second color light. The first inter-identical color pixel wall member is positioned in a gap among the plurality of first color filters, and has a refractive index lower than a refractive index of the first color filter. The inter-pixel light shielding film is positioned in a gap between the plurality of first color pixels and the plurality of second color pixels, and suppresses transmission of light entering the pixel array unit.