OLED Luminaire Thermal Control for Uniform Aging
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Solution Overview
Problem
Organic light-emitting diodes (OLEDs) in automobile luminaires experience non-uniform aging due to varying temperatures, leading to a shorter lifetime for the entire luminaire, as higher temperatures accelerate aging nonlinearly, and existing designs often operate below rated power to compensate, reducing efficiency.
Innovation Solution
An organic light-emitting component device with a temperature detecting system and control unit that adjusts operating parameters such as current density, voltage, and modulation to maintain a uniform temperature across OLEDs, ensuring all components age at the same rate by actively regulating their operating conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If OLEDs are operated at higher temperatures to increase brightness and efficiency, then light output improves, but aging accelerates nonlinearly reducing lifetime
Solution Approach 1:
The patent implements dynamic adjustment of operating parameters (current density, voltage, pulse width modulation) based on real-time temperature feedback from individual OLED sensors. This allows the system to optimize light output while preventing excessive temperature-induced aging, resolving the contradiction between brightness and lifetime by making the operating conditions adaptive rather than static
Solution Approach 2:
The system changes multiple operating parameters simultaneously (current density, voltage, pulse duration) based on temperature conditions. By adjusting these parameters dynamically, the system can maintain high light output when temperatures are acceptable while reducing stress on OLEDs when temperatures rise, thus managing the trade-off between illumination intensity and lifetime
2Ease of manufacture
If different OLEDs are operated at the same current density, then manufacturing and control is simplified, but temperature variations cause non-uniform aging
Solution Approach 1:
The patent assigns individual temperature sensors and dedicated control algorithms to each OLED or OLED group, allowing localized adjustment of operating parameters based on local temperature conditions. This enables uniform aging across different OLEDs while maintaining relatively simple manufacturing by using standard sensor and controller components configured for individualized control
3Duration of action of stationary object
If OLEDs are de-rated to operate below maximum power, then lifetime is extended, but overall luminous output and efficiency decrease
Solution Approach 1:
Instead of static de-rating, the system dynamically adjusts operating power based on real-time temperature conditions. When temperatures are low, OLEDs can operate at or near maximum power for high luminous output. When temperatures rise, power is reduced to prevent excessive aging. This dynamic approach maintains high productivity while extending lifetime compared to continuous de-rating
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 extends the lifetime of OLED luminaires by preventing non-uniform aging, maintaining consistent brightness, and adhering to standards, even in worst-case installation scenarios.
Implementation Method 1
a temperature detecting device (260) configured for detecting at least one temperature (TOLED1-3, TA)
Data Source
AI summary
An organic light-emitting component device comprising a first and second organic light-emitting component, a temperature detecting device configured for detecting at least one temperature, and a control unit coupled to the temperature detecting device and configured to operate the first and second component. The control unit is such that a first or second operating parameter of the first or second component, respectively, is changed, wherein the temperature detecting device comprises a first and second temperature detecting device. The first and second temperature detecting devices are designed for detecting a first and second temperature of the first and second component, respectively. The control unit is configured to change the first or second operating parameter depending on the difference between the first and second temperature, wherein the first or second operating parameter is changed such that the same temperature is established at the first and second component.