LED Aging Compensation via Electrical Parameter Monitoring
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Solution Overview
Problem
The optical characterization of light emitting diode (LED) arrangements, especially those with multiple LEDs, is often time-consuming and difficult, making it challenging to monitor LED aging and its impact on light output, leading to issues with color control and brightness control.
Innovation Solution
A method that determines instantaneous current-voltage pairs for LEDs, allowing for an updated current feed to compensate for aging effects without requiring optical measurements, using an equivalent circuit with a parasitic non-radiating diode and series resistor to adjust the current feed for each dimming level, ensuring reliable light output matching the original level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical characterization methods are used to monitor LED aging, then measurement precision is improved, but device complexity and time consumption increase significantly
Solution Approach 1:
The patent replaces complex optical measurement systems with simple electrical measurements. Instead of using optical sensors and characterization equipment to monitor LED aging, the invention measures only the forward voltage of LEDs at different current levels and uses electrical calculations to determine aging effects. This substitution dramatically reduces device complexity while maintaining measurement capability.
Solution Approach 2:
The patent extracts only the essential electrical parameter (forward voltage) needed for aging characterization, eliminating the need for comprehensive optical measurements. By taking out just the critical electrical measurement component and using it in combination with temperature data, the system achieves effective LED aging monitoring without the complexity of full optical characterization systems.
2Measurement precision
If optical measurements are performed to characterize LED light output, then measurement precision is improved, but time consumption increases
Solution Approach 1:
The patent replaces time-consuming optical measurement processes with rapid electrical measurements. By measuring forward voltage electrically and calculating light output characteristics through electrical parameters and temperature compensation, the system achieves accurate LED characterization in a fraction of the time required for optical methods.
Solution Approach 2:
The patent performs preliminary electrical characterization measurements during LED operation rather than requiring separate optical measurement sessions. By continuously or periodically measuring forward voltage and temperature during normal operation, the system accumulates characterization data without interrupting or adding significant time to the operational workflow.
3Measurement precision
If comprehensive optical characterization is performed on multiple LEDs, then measurement precision is improved, but productivity decreases
Solution Approach 1:
The patent replaces slow optical characterization processes with rapid electrical measurements for multiple LEDs. By measuring forward voltage and temperature electrically for each LED in the arrangement and calculating characteristics through electrical formulas, the system achieves comprehensive characterization of multiple LEDs simultaneously with much higher throughput than optical methods.
Solution Approach 2:
The patent segments the characterization process into individual electrical measurements for each LED within the arrangement. By measuring forward voltage and temperature for each LED separately through simple electrical connections and processing the data independently, the system efficiently characterizes multiple LEDs without the bottlenecks of centralized optical measurement systems.
4Illumination intensity
If current feed is increased to compensate for LED aging, then light output is maintained, but energy consumption increases
Solution Approach 1:
The patent uses parameter changes in forward voltage and temperature to detect LED aging effects and compensates by adjusting current feed only when necessary. By continuously monitoring electrical parameters and comparing against reference values, the system increases current feed selectively to maintain light output, rather than continuously operating at maximum current, thereby reducing overall energy consumption while maintaining illumination consistency.
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 method enables simple and reliable characterization and compensation of LED aging, maintaining consistent light output across different dimming levels and varying aging behaviors, thereby preventing faulty color control and brightness issues.
Implementation Method 1
The light emitting diode arrangement (1) with at least one light emitting diode (2) which is driven with an instantaneous current feed
Implementation Method 2
an equivalent circuit with a parasitic non-radiating diode and series resistor
Data Source
AI summary
A method for operating a light emitting diode arrangement with at least one light emitting diode includes the steps of: a) determining at least one instantaneous current-voltage value pair; b) matching the instantaneous current-voltage value pair with an original current-voltage value pair; and c) determining an updated current feed based on the matching and driving the light emitting diode with the updated current feed.