Dual Optical Sensor Module with Shared Readout Circuitry
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Solution Overview
Problem
Existing camera systems face challenges in producing high-quality images at low light levels, with previous solutions either leading to noise issues in RGB pixels due to uneven light distribution or being inefficient in power usage and unsuitable for video applications.
Innovation Solution
A dual or multiple sensor camera system is developed, featuring first and second sensor arrays on a shared substrate with common readout circuitry, along with a dual lens assembly, allowing for improved low-light performance by combining outputs from sensors responsive to different optical conditions, including infrared radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single sensor with RGGB filter is used, then high luminance resolution is achieved, but RGB pixels become underexposed and suffer from noise issues
Solution Approach 1:
The patent divides the imaging function into two separate sensors: one optimized for luminance (brightness) detection and another for color (RGB) detection. This segmentation allows each sensor to be specialized for its specific function, with the luminance sensor capturing more light for better brightness resolution while the color sensor handles color information without being underexposed.
Solution Approach 2:
The patent adds a temporal dimension by using different integration times for the two sensors. The luminance sensor uses a longer integration time to capture more light photons, while the color sensor uses a shorter integration time. This dimensional change in time allows the system to optimize light capture for each sensor type without compromising the other.
2Reliability
If separate sensors at different wavelengths and integration times are used, then low light performance is improved, but there is no teaching of sensor alignment or how multiple sensors can be used together
Solution Approach 1:
The patent merges multiple sensors onto a single substrate, integrating the luminance sensor and color sensor in close proximity. This physical merging simplifies the alignment process by providing a common reference plane and reduces the complexity of integrating multiple separate camera modules. The shared substrate provides a stable mechanical foundation that facilitates precise alignment between the different sensor types.
3Measurement precision
If white light illumination (flash or LED) is used, then color image quality is improved, but power consumption increases and it is not suitable for video applications
Solution Approach 1:
The patent enables the imaging system to serve itself by using the luminance sensor's ability to detect infrared and low-level light to compensate for insufficient lighting conditions. Instead of requiring external white light illumination (flash or LED), the system uses the specialized luminance sensor to capture available light more efficiently, thereby reducing or eliminating the need for power-consuming illumination sources.
4Adaptability or versatility
If a thicker epitaxial Silicon layer is used to alter absorption depth, then different wavelengths can be detected, but manufacturing complexity and cost increase
Solution Approach 1:
Rather than using a single thick epitaxial layer to detect all wavelengths, the patent segments the detection function across two separate sensors with different layer structures. One sensor is optimized for visible light with standard thickness, while the other is optimized for infrared and low-level light with different material properties. This segmentation allows each sensor to be manufactured with optimal parameters for its specific wavelength range, simplifying the overall manufacturing process.
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 system effectively produces high-quality images in low-light conditions by leveraging shared readout circuitry and dual lens assemblies, enhancing sensitivity and reducing noise, making it suitable for both still images and video applications while being power-efficient.
Implementation Method 1
first and second sensor arrays formed on a substrate... with the first and second and second sensor arrays being adapted to share common read out circuitry... one sensor responsive to IR radiation
Data Source
AI summary
A sensor module has first and second sensor arrays formed on a substrate, with the first and second sensor arrays adapted to share common readout circuitry and shared read out for a pair of sensors on a single array.