Multi-Layered High-Dynamic Range Image Sensor
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Solution Overview
Problem
Conventional image sensors struggle with capturing scenes with drastic lighting changes due to limited dynamic range, leading to saturation in bright areas and loss of detail in low-light areas, as they either reduce resolution with filters or suffer from ghosting when compositing multiple exposures.
Innovation Solution
A multi-layered image sensor design where each sensing element has multiple layers with varying sensitivities, allowing each layer to record photons and attenuate the flow into the next, enabling the combination of data to produce a higher dynamic range image without reducing resolution or causing ghosting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional image sensors are used to capture scenes with drastic lighting changes, then the sensor structure remains simple, but the dynamic range is limited causing saturation in bright areas and loss of detail in low-light areas
Solution Approach 1:
The sensor is segmented into multiple layers, with each layer having different sensitivity characteristics. This segmentation allows each layer to capture different ranges of light intensities, thereby extending the overall dynamic range of the sensor without requiring a completely complex sensor structure
Solution Approach 2:
Multiple sensing layers are nested within each other, with each layer containing photodetectors that are sensitive to different intensity ranges. The nested structure allows compact integration of multiple sensitivity levels within a single sensor element, improving dynamic range while controlling structural complexity
2Reliability
If neutral density filters are used to reduce sensitivity in certain areas, then dynamic range is improved, but the number of sensels per unit area is reduced
Solution Approach 1:
Instead of reducing the number of sensels in the planar dimension, the patent adds a vertical dimension by stacking multiple layers. Each layer contributes additional sensels, increasing the total number of sensing elements per unit area while maintaining or improving dynamic range through the layered architecture
3Reliability
If multiple images with different exposures are taken and composited, then dynamic range is improved, but ghosting occurs when there are movements between exposures
Solution Approach 1:
The sensor performs preliminary action by capturing multiple exposure ranges simultaneously in a single snapshot through the multi-layer architecture. This eliminates the need for sequential exposures and compositing, thereby preventing ghosting artifacts caused by movement between exposures while still achieving high dynamic range
Solution Approach 2:
The patent merges the functionality of multiple exposure captures into a single simultaneous capture event. The multiple layers are combined within each sensor element, allowing the sensor to record different exposure ranges at the same moment, thus avoiding ghosting while achieving high dynamic range
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 multi-layered design effectively captures a wider dynamic range, preventing saturation in bright areas and preserving detail in low-light areas, resulting in a higher quality image with improved resolution and reduced ghosting artifacts.
Implementation Method 1
each layer of each sensing element is configured to attenuate flow of the photons into the next layer
Implementation Method 2
each sensing element including a plurality of layers of varying sensitivities, wherein the plurality of layers is configured to record impinging photons
Data Source
AI summary
An image sensor including: a plurality of sensing elements, each sensing element including a plurality of layers of varying sensitivities, wherein the plurality of layers is configured to record impinging photons, and wherein each layer of each sensing element is configured to attenuate flow of the photons into the next layer. Key words include a multi-layered sensor and high-dynamic range.