Vehicle Cabin Illumination Control with Chromaticity Correction
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Solution Overview
Problem
Full-color LED devices used for vehicle cabin illumination exhibit significant individual differences in light emission characteristics, leading to variations in perceived hue across different locations, making it difficult to achieve desired chromaticity without using pre-selected special LED devices, which increases costs.
Innovation Solution
An illumination control device with a control portion that adjusts light emission states using correction coefficients to achieve desired chromaticity, allowing for calibration of chromaticity after assembly and use, even with varying LED light sources, by incorporating an input portion for chromaticity adjustment and a chromaticity measuring instrument to calculate and apply correction coefficients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If full-color LED devices are used for cabin illumination, then various chromaticities can be obtained, but large individual differences in light emission characteristics cause hue variation across different locations
Solution Approach 1:
The patent applies parameter changes by adjusting the emission intensity ratios of R, G, and B LED groups through correction coefficients. Instead of selecting LEDs with precise initial characteristics, the system modifies the operating parameters (emission intensities) to compensate for individual differences, achieving consistent chromaticity across multiple light sources
Solution Approach 2:
The patent implements feedback by measuring the actual chromaticity of each LED device and using this information to calculate correction coefficients. The system continuously monitors and adjusts the emission intensities based on measured values, closing the loop to maintain hue consistency despite manufacturing variations
2Manufacturing precision
If pre-selected special LED devices are used to limit individual differences, then hue consistency is improved, but component cost increases greatly
Solution Approach 1:
The patent uses inexpensive ordinary LED devices instead of expensive pre-selected special LED devices. By accepting that individual differences exist and compensating through software-based correction coefficients, the system replaces costly hardware selection with cheaper post-manufacturing calibration
Solution Approach 2:
The patent changes the approach from selecting LEDs with specific parameters during manufacturing to adjusting emission parameters after manufacturing. Correction coefficients modify the effective emission characteristics of ordinary LEDs to match the desired chromaticity, eliminating the need for expensive pre-selected components
3Illumination intensity
If multiple LED light sources are disposed at different places in the cabin, then overall illumination is achieved, but large variation in light-emitting characteristic causes hue difference from one place to another
Solution Approach 1:
The patent applies local quality by calculating and applying individual correction coefficients to each LED device based on its specific light emission characteristics. Each light source is locally optimized with its own correction coefficients, allowing heterogeneous LEDs to produce uniform chromaticity across different locations in the cabin
Solution Approach 2:
The patent modifies the emission parameters of each LED device individually through correction coefficients. By adjusting the R, G, and B emission intensities locally at each light source, the system compensates for individual differences and achieves uniform hue perception throughout the cabin space
Data Source
AI summary
An illumination control device includes a control portion which controls light emission states of luminous bodies and having different light emission colors from one another, so that a cabin is illuminated by emitted light emitted from a light source and having predetermined chromaticity. The light source has the luminous bodies. The control portion controls the light emission states of the luminous bodies in accordance with a correction coefficient inputted from outside to adjust the chromaticity of the emitted light.