Lighting Control Circuit Ambient Light Feedback Compensation
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Solution Overview
Problem
Modulating output brightness levels of lighting systems based on ambient light input is challenging due to aesthetic uniformity concerns and light feedback from internal structures, which complicates accurate readings from ambient light sensors.
Innovation Solution
A controller circuit with internal light sensors generates calibration values for adjusting ambient brightness readings, accounting for light feedback by determining stable output periods, scaling calibration values with user brightness settings, and subtracting internal light contributions to provide accurate control signals for lighting output adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the light sensor is placed behind optical elements within the panel to maximize aesthetic uniformity, then aesthetic uniformity is improved, but measurement precision deteriorates due to light feedback from internal lighting elements
Solution Approach 1:
The system performs preliminary calibration by measuring light feedback from internal lighting elements at known stable output periods and storing these measurements as calibration values. This preliminary action enables the system to later subtract these calibration values from sensor readings to compensate for light feedback, thereby maintaining measurement precision while keeping the sensor hidden behind optical elements for aesthetic uniformity.
2Shape
If the light sensor is hidden from direct view to maintain aesthetic uniformity, then aesthetic uniformity is improved, but device complexity increases due to the need for calibration mechanisms
Solution Approach 1:
The lighting device performs self-calibration by using its own internal lighting elements as the light source for calibration measurements. The system automatically identifies stable output periods, measures the light feedback from its own LEDs, stores these calibration values, and uses them to compensate for light feedback during normal operation. This self-service approach eliminates the need for external calibration equipment or complex manual calibration procedures, thereby reducing device complexity while maintaining aesthetic uniformity.
3Measurement precision
If calibration values are generated at stable output periods to compensate for light feedback, then measurement precision is improved, but productivity decreases due to additional calibration steps
Solution Approach 1:
The system performs calibration measurements in advance during stable output periods and stores these calibration values for later use. By performing this calibration action preliminarily, the system avoids the need for real-time calibration calculations during ambient light monitoring, thereby maintaining high measurement precision while minimizing the impact on system response speed and productivity.
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 ensures accurate and aesthetically uniform control of lighting output by compensating for light feedback, allowing for precise adjustment of brightness levels and maintaining uniformity across modular lighting systems.
Implementation Method 1
The light sensor is a photoelectric device which is adapted to measure one or more light characteristics, such as luminous intensity (e.g., Candela), an amount of visible light (e.g., Lumen), an amount of visible light that falls on a surface (e.g., Lux)
Data Source
AI summary
Embodiments of the present disclosure generally relate to the field of controlling light output, and more specifically, embodiments relate to devices, systems and methods for modulating output brightness levels of a system based on ambient light input. In particular, systems and methods for compensating for light feedback are described, along with systems and methods for determining output lighting states based on relative light levels, and methods for calibration of self-feedback values.