LED Light Detector Cavity for Ambient Light Isolation
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Solution Overview
Problem
Existing LED control systems inaccurately measure and control light intensity due to ambient light absorption and reflection, leading to varying light output over time.
Innovation Solution
A system with a light detector and control circuit located in a cavity adjacent to the LED, featuring an aperture to emit light while minimizing exposure to ambient light, and finishes on the emitting surface to retard reflection and absorption, ensuring accurate measurement and control of light intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the light detector is exposed to ambient light for passive detection, then the control system can detect light intensity, but the measurement accuracy deteriorates due to absorption and reflection of ambient light by the LED and semiconducting material
Solution Approach 1:
The system divides the detection function into two separate detectors: an active detector that measures only LED-emitted light through a directed optical path, and a passive detector that measures ambient light. This segmentation allows the active detector to provide accurate measurements不受ambient light interference, while the passive detector maintains ambient light detection capability.
Solution Approach 2:
The patent introduces an intermediary active detection system with a directed optical path between the LED and measurement point. This intermediary mechanism selectively transmits only LED-emitted light to the active detector, filtering out ambient light interference and enabling accurate intensity measurements.
2Adaptability or versatility
If the LED is exposed to ambient light in open systems, then the LED can function in various environments, but the light intensity varies substantially over time due to absorption and reflection of ambient light
Solution Approach 1:
The control system continuously monitors the LED's light intensity using the active detector and adjusts the drive current in real-time to compensate for variations caused by ambient light conditions. This feedback loop maintains stable light output despite changes in environmental lighting conditions.
Solution Approach 2:
The system dynamically adjusts the LED's operating parameters (current, pulse width) based on real-time feedback from the active detector. This dynamic control allows the LED to maintain consistent light intensity output despite varying ambient light conditions, transforming a static system into an adaptive one.
3Extent of automation
If a control system is designed to measure and control LED intensity, then the intensity can be regulated, but the system inadvertently measures ambient light along with emitted light, causing substantial variation in output intensity
Solution Approach 1:
The detection system is segmented into active and passive detectors with distinct functions. The active detector with directed optical path measures only LED-emitted light for precise control feedback, while the passive detector handles ambient light measurement separately, eliminating cross-contamination of measurement signals.
Solution Approach 2:
The active detector is equipped with a directed optical path that creates a localized measurement zone specifically for LED-emitted light. This local quality enhancement ensures that only light from the intended source is measured, excluding ambient light from the measurement region and improving measurement precision.
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 provides stable and uniform light output by isolating the detector from ambient light, allowing precise control of the LED's intensity and maintaining consistent illumination.
Implementation Method 1
a light detector located in a position adjacent to the LED for reading and/or measuring the intensity of light emitted from the LED
Implementation Method 2
The LED and the light detector may be located in a cavity which may limit exposure of the LED and the light detector to ambient light
Implementation Method 3
incorporating finishes or coatings on the LED's emitting surface to retard reflection and absorption
Implementation Method 4
Absorption of the ambient light by the semiconducting material alters the properties of the semiconducting material
Data Source
AI summary
A system and/or a method read, measure and/or control intensity of light emitted from a light-emitting diode (LED). A light detector may be located in a position adjacent to the LED for reading and/or measuring the intensity of light emitted from the LED. The LED and the light detector may be located in a cavity which may limit exposure of the LED and the light detector to ambient light. The cavity may have an aperture for allowing light emitted from the LED to exit the chamber to illuminate an environment in which the chamber is located. The aperture may be located between the cavity and a compartment, and the LED may emit light through the aperture into the compartment. An additional detector may be located in the compartment and/or may extend from the cavity through an additional aperture into the compartment.