Solid-State Image Sensor Pixel Layout for Color Mixture Prevention
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Solution Overview
Problem
In solid-state imaging devices where incident light is obliquely incident on the microlens, there is a risk of light being reflected by the waveguide wall part, leading to color mixture and reduced pixel sensitivity.
Innovation Solution
A solid-state imaging device with microlenses that condense light, color filters that transmit specific wavelengths, and waveguide wall parts arranged for pupil correction between color filters, preventing light scatter and enhancing pixel sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If waveguide wall parts are used to prevent light diffusion in color filters, then pixel sensitivity is improved, but oblique incident light is reflected by the waveguide wall part causing color mixture
Solution Approach 1:
A pupil correction part is introduced as an intermediary component between the microlens and the waveguide wall part. This pupil correction part modifies the light path before light reaches the waveguide wall part, preventing oblique incident light from being reflected by the waveguide wall part while maintaining the light-guiding function for normal incident light.
Solution Approach 2:
The optical path control is segmented into two stages: first, the microlens condenses incident light, and second, the pupil correction part adjusts the light path before light enters the waveguide wall part. This segmentation allows each component to perform its specific function without causing harmful effects.
2Productivity
If waveguide wall parts are positioned to guide light efficiently, then pixel sensitivity is enhanced, but light may hit the waveguide wall part at oblique angles causing scattering
Solution Approach 1:
The pupil correction part serves as a mediator that prepares the light path before light reaches the waveguide wall part. It ensures that light arrives at the waveguide wall part at appropriate angles for efficient guidance while preventing conditions that would lead to scattering.
Solution Approach 2:
The pupil correction part performs preliminary action by correcting the light path before light enters the waveguide wall part. This preliminary correction prevents oblique incident light from reaching the waveguide wall part at angles that would cause scattering, ensuring efficient light guidance from the start.
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 device improves pixel sensitivity and prevents color mixture by guiding light efficiently to the photoelectric conversion parts, maintaining image quality.
Implementation Method 1
a plurality of microlenses that condenses incident light
Implementation Method 2
a plurality of color filters that transmits light of a specific wavelength included in the condensed incident light
Implementation Method 3
a plurality of photoelectric conversion parts on which light having a specific wavelength transmitted through the color filter is incident
Data Source
AI summary
Provided is a solid-state imaging device capable of enhancing pixel sensitivity and preventing color mixture. A solid-state imaging device includes: a plurality of microlenses that condenses incident light; a plurality of color filters that transmits light of a specific wavelength included in the condensed incident light; a plurality of photoelectric conversion parts on which light having a specific wavelength transmitted through the color filter is incident; and a plurality of waveguide wall parts arranged between the color filters and surrounding the color filter. Then, each of the plurality of waveguide wall parts is formed in a position subjected to pupil correction.