Variable-Colour Light Source Control Using Calibration Data
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Solution Overview
Problem
Existing variable-colour light sources face challenges in achieving precise colour control at different brightness values due to varying characteristics and potential non-linearity of individual light sources, requiring cumbersome manual adjustments or complex feedback control systems.
Innovation Solution
A control device that generates activation signals for individually controllable colour light sources based on calibration data, including colour vectors and brightness response mappings, allowing for efficient and accurate colour control independently of temperature changes or wear over time, without the need for manual fine-tuning or complex feedback mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual adjustment of individual light sources is used to achieve precise colour control, then colour accuracy is improved, but ease of operation deteriorates due to cumbersome adjustments
Solution Approach 1:
The patent applies preliminary action by performing calibration of individual light sources during manufacturing. Calibration parameters are measured and stored in memory before the product is deployed, eliminating the need for manual adjustment during operation. The control unit automatically retrieves these pre-stored parameters to compensate for manufacturing variations, thereby achieving precise colour control without requiring user intervention.
2Measurement precision
If feedback control mechanisms are implemented to achieve precise colour control, then colour accuracy is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex feedback control mechanisms with a feedforward control approach. Instead of using sensors and control loops to continuously adjust light output, the system uses pre-measured calibration parameters stored in memory. The control unit directly applies these parameters to compensate for manufacturing variations, substituting a simple lookup and calculation process for what would otherwise require complex real-time feedback control hardware and software.
3Stability of the object's composition
If individual light sources are controlled to maintain constant colour across different brightness values, then colour consistency is improved, but ease of operation deteriorates due to difficulty in coordinating multiple potentiometers
Solution Approach 1:
The patent applies self-service by enabling the control unit to automatically maintain constant colour across different brightness values. The system uses stored calibration parameters and brightness response mappings to automatically calculate the appropriate drive signals for each light source, ensuring colour consistency without requiring the user to manually coordinate multiple potentiometers. The device performs the complex coordination task autonomously based on a single user input.
4Manufacturing precision
If calibration data is stored for each individual light source to compensate for manufacturing variations, then manufacturing precision is improved, but device complexity increases due to additional data storage and processing
Solution Approach 1:
The patent applies parameter changes by storing compact calibration parameters for each light source that characterize its specific colour and brightness response. These parameters are used by the control unit to transform desired colour and brightness values into appropriate drive signals. The system manages the complexity of handling multiple parameters through efficient data structures and algorithms, maintaining colour accuracy while keeping the implementation practical.
Data Source
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AI summary
Disclosed is a control device for controlling a variable-colour light source, the variable-colour light source comprising a plurality of individually controllable colour light sources. The control device comprises a control unit for generating, responsive to an input signal indicative of a colour and a brightness, respective activation signals for each of the individually controllable colour light sources. The control unit is configured to generate the activation signals from the input signal and from predetermined calibration data indicative of at least one set of colour values for each of the individually controllable light sources.