Time Division Illumination Control Using Single Sensor
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current diode lighting modules face issues with unsteady brightness due to temperature and aging, leading to complex and costly calibration processes, especially when using multiple photosensors, which complicates the application of color sequence techniques.
Innovation Solution
A brightness and color control system utilizing a single broadband sensor for time division sampling and feedback control of a point light source, comprising a timing sampling controller, light source driver, broadband monitor, computing unit, and current adjuster, to adjust illumination brightness and color, simplifying calibration and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple photosensors are used to read luminous intensity and color components, then the control precision of brightness and color is improved, but the device complexity and calibration difficulty increase
Solution Approach 1:
The patent segments the measurement process by time, using a single broadband photosensor to measure different wavelength components at different time points through time-division multiplexing. This avoids the need for multiple simultaneous photosensors while maintaining measurement capability across all wavelength components.
Solution Approach 2:
A single broadband photosensor is designed to perform multiple measurement functions by sequentially measuring different wavelength components. The same sensor handles red, green, blue, and other wavelength measurements at different time points, eliminating the need for multiple specialized sensors.
2Measurement precision
If multiple photosensors are used for color sequence technique, then the color measurement accuracy is improved, but the ease of manufacture deteriorates due to high cost and complex calibration
Solution Approach 1:
The measurement of different color components is segmented into sequential time slots, allowing a single sensor to capture all color information through time-division multiplexing rather than requiring multiple simultaneous sensors.
Solution Approach 2:
The system employs periodic switching between different wavelength emissions and corresponding measurements, creating a rhythmic measurement cycle that allows a single sensor to gather complete color information over time.
3Device complexity
If a single broadband sensor is used for time division sampling, then the device complexity is reduced, but the measurement precision may be affected
Solution Approach 1:
The measurement process is segmented into distinct time intervals for different wavelength components, allowing the single broadband sensor to focus on one wavelength at a time, thereby maintaining measurement precision while reducing hardware complexity.
Solution Approach 2:
The system incorporates feedback mechanisms where the measured luminous intensity values are used to adjust and optimize the driving currents, ensuring that measurement precision is maintained through iterative correction even with a single sensor.
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 stabilizes brightness and color by using a single broadband sensor for time division sampling, reducing calibration complexity and manufacturing costs while improving lighting quality by uniformly mixing multi-color diodes into white light with desired color temperature and intensity.
Implementation Method 1
a broadband light source monitor, for sensing and sampling the point light source that is emitting lights at a specific time for the luminous intensity signal value
Data Source
AI summary
An illumination brightness and color control system for adjusting the illumination of a plurality of point light sources and method therefor are provided, implemented in a time division manner. A single photosensor senses and samples a point light source for the luminous intensity signal value. Then, the luminous intensity signal value at each wavelength and a target brightness/color value are compute to acquire a corrected current value, and the corrected current value is fed back to a light source driver. Therefore, the brightness/color value of the point light sources is adjusted to be in a steady state.