Mobile Device Flash Spectral Control for Sensitivity and Color
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Solution Overview
Problem
Mobile devices with flashlights face a trade-off between sensitivity improvement and color reproducibility, particularly in low illuminance environments, where enhancing sensitivity compromises image color accuracy.
Innovation Solution
Incorporating a light-emitting device with a semiconductor element that adjusts its spectral power distribution to maintain suitable color reproducibility by optimizing the spectral overlap in specific wavelength regions, such as the green and red spectral sensitivity spectra, and using a wavelength control element to refine the outgoing light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the spectral sensitivity spectra of color regions are overlapped to improve sensitivity, then sensitivity is improved, but color reproducibility deteriorates
Solution Approach 1:
The patent applies parameter changes by carefully controlling the degree of spectral sensitivity overlap between color regions. Instead of complete overlap or complete separation, the invention optimizes the overlap parameter to a specific range that balances sensitivity enhancement with color reproducibility maintenance, resolving the technical contradiction between these two opposing requirements.
2Reliability
If sensitivity improvement operations are carried out to enable imaging in low illuminance environments, then sensitivity is improved, but color reproducibility becomes insufficient
Solution Approach 1:
The patent resolves this contradiction by optimizing the spectral sensitivity parameters of the imaging element. Specifically, it controls the overlap degree between spectral sensitivity spectra of different color regions to fall within a predetermined range, enabling both improved sensitivity for low-light imaging and maintained color reproducibility.
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 approach enables mobile devices to achieve improved sensitivity and color reproducibility, ensuring vivid and natural image capture even in challenging lighting conditions.
Implementation Method 1
the light-emitting device includes a semiconductor light-emitting element
Data Source
AI summary
A mobile device including: at least an imaging element; and a light-emitting device that irradiates a subject in accordance with imaging of the imaging element, in which the light-emitting device includes a semiconductor light-emitting element, and the difference of the normalized spectral power distribution at a wavelength of 580 nm and a value B representing a difference between normalized spectral power distributions in a wavelength range from 540 nm to 610 nm and a wavelength range from 610 nm to 680 nm are appropriate values. By providing a wavelength control element, it is possible to improve the color reproducibility and the like of a captured image. The mobile device achieves both sensitivity improvement and color reproducibility in a trade-off relationship.