Image Sensor Pixel Layout for Wider Wavelength HDR Capture
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Solution Overview
Problem
Existing image sensors fail to capture images with high dynamic range in varying brightness environments, resulting in incomplete image details and an inability to accurately represent real-world visuals.
Innovation Solution
An image sensor design featuring a main photosensitive region surrounded by auxiliary photosensitive regions with different photosensitive component content, expanding the wavelength range and enabling improved dynamic range by alternating first and second auxiliary regions with distinct compositions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single photosensitive region with uniform photosensitive component content is used, then the device structure is simple, but the dynamic range is limited and cannot capture images in varying brightness environments
Solution Approach 1:
The photosensitive region is segmented into a main photosensitive region and multiple auxiliary photosensitive regions arranged in different patterns (first auxiliary regions and second auxiliary regions). Each region has different photosensitive component content, allowing simultaneous capture of different brightness levels and expanding the dynamic range of the image sensor.
Solution Approach 2:
Different regions of the photosensitive structure are assigned different photosensitive component contents. The main photosensitive region has one composition while the auxiliary regions have different compositions, enabling each region to optimize for specific lighting conditions and collectively providing high dynamic range performance.
2Measurement precision
If the photosensitive component content is increased to improve sensitivity, then the sensitivity is improved, but the wavelength range coverage is reduced
Solution Approach 1:
The photosensitive component content is varied across different regions (main and auxiliary regions) to change the photosensitivity parameters. By adjusting the photosensitive component content in auxiliary regions, the sensor achieves different sensitivity levels and wavelength responses in different areas, simultaneously improving sensitivity and wavelength range coverage.
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 design enhances image detail capture and generates images with high dynamic range, providing a visual effect closer to real-world environments by enlarging the wavelength range of sensible light and improving sensitivity across different light conditions.
Implementation Method 1
the photosensitive unit includes a main photosensitive region and an auxiliary photosensitive region arranged at a periphery of the main photosensitive region, a photosensitive component content of the main photosensitive region is different from a photosensitive component content of the auxiliary photosensitive region
Data Source
AI summary
Disclosed is an image sensor, comprising: at least one photosensitive unit, where the photosensitive unit includes a main photosensitive region and an auxiliary photosensitive region arranged at the periphery of the main photosensitive region, and a photosensitive component content of the main photosensitive region is different from a photosensitive component content of the auxiliary photosensitive region. The disclosure enlarges a wavelength range of sensible light of each the photosensitive unit by arranging the auxiliary photosensitive region at the periphery of the main photosensitive region of the photosensitive unit, where the photosensitive component content of the main photosensitive region is different from that of the auxiliary photosensitive region. Thereby more image details may be recorded to generate images with high dynamic range, which enables people to experience a visual effect close to a real environment.