Quantum Film Imagers for Array Camera Light Sensitivity
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Solution Overview
Problem
Conventional cameras, especially mobile cameras, face performance constraints such as low light sensitivity, reduced signal-to-noise ratio, and limited dynamic range due to the use of Bayer filter sensors, which restrict their ability to capture high-quality images, especially in low-light conditions.
Innovation Solution
The integration of quantum film imagers with quantum dots onto the surface of the focal plane in array cameras, replacing traditional silicon photodiodes, enhances light sensitivity and reduces optical crosstalk, allowing for improved light gathering and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If Bayer filter sensors are used in conventional cameras, then color image capture is enabled, but light sensitivity is reduced
Solution Approach 1:
The patent removes the Bayer filter mosaic from the optical path, extracting the color filtering function from the pixel level. This allows all pixels to capture full-color information without wavelength-selective filters, thereby improving light sensitivity while maintaining color capture capability through computational processing.
Solution Approach 2:
The patent replaces the mechanical/optical Bayer filter system with a computational color reconstruction system. Instead of using physical color filters at each pixel, the system uses algorithms to reconstruct full-color images from grayscale or reduced-color sensor data, eliminating the light-blocking filters while preserving color information.
2Measurement precision
If Bayer filter mosaic is applied to pixels, then color information can be captured, but signal-to-noise ratio is reduced
Solution Approach 1:
The patent extracts and removes the Bayer filter mosaic from the imaging system, eliminating the source of signal loss and noise introduction. By capturing light directly at the sensor without intermediate filtering, the system preserves maximum signal strength and minimizes noise, while color information is recovered through computational methods.
3Ease of manufacture
If conventional silicon photodiodes are used, then standard image capture is achieved, but light gathering capability is limited
Solution Approach 1:
The patent changes the physical parameters of the sensor by replacing conventional silicon photodiodes with quantum dot-based sensors. Quantum dots have tunable bandgap energies that can be optimized for specific wavelength ranges, enabling enhanced light absorption efficiency and improved light gathering capability while maintaining compatibility with standard imaging architectures.
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 solution significantly increases the light sensitivity and reduces optical crosstalk, leading to improved image quality and relaxed lens chief ray angle requirements, enabling array cameras to capture higher-quality images with enhanced dynamic range and signal-to-noise ratio, particularly in low-light conditions.
Implementation Method 1
when the size of the quantum dot is smaller than the exciton Bohr radius, the electrons crowd together leading to the splitting of the original energy levels into smaller ones with smaller gaps between each successive level. Thus, if the size of the quantum dot is small enough that the quantum confinement effects dominate (typically less than 10 nm), the electronic and optical properties change, and the fluorescent wavelength is determined by the particle size.
Implementation Method 2
the fluorescent wavelength is determined by the particle size. In general, the smaller the size of the quantum dot particle, the larger the band gap, the greater becomes the difference in energy between the highest valence band and the lowest conduction band, therefore more energy is needed to excite the dot, and concurrently, more energy is released when the crystal returns to its resting state.
Data Source
AI summary
Array cameras incorporating quantum film imagers are disclosed. One embodiment includes: a plurality of focal planes, where each focal plane comprises a plurality of rows of pixels that also form a plurality of columns of pixels and each focal plane is contained within a region of the imager array that does not contain pixels from another focal plane; at least one quantum film located on the surface of the imager array, where each quantum film comprises a plurality of quantum dots; control circuitry configured to control the capture of image information by the pixels within the focal planes, where the control circuitry is configured so that the capture of image information by the pixels in at least two of the focal planes is separately controllable; and sampling circuitry configured to convert pixel outputs into digital pixel data.