OLED Illumination Device Current Regulation Circuit
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The illumination quality of organic light-emitting diode (OLED) devices decreases over their lifetime due to increasing electric resistance, limiting their suitability for various applications.
Innovation Solution
An illumination device with a control device that regulates current through the OLED as a function of its increasing resistance, using an operational amplifier, resistors, and a potentiometer to maintain constant intensity and brightness, and includes a fuse for protection against excessive current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If OLED is used as light source, then device can be used for lighting purposes, but illumination quality changes over device lifetime due to increasing electric resistance
Solution Approach 1:
The control device continuously monitors the electric resistance of the OLED and adjusts the drive current accordingly. As the OLED ages and resistance increases, the control device detects this change and increases the current to compensate, thereby maintaining constant illumination quality throughout the device lifetime.
Solution Approach 2:
The system dynamically changes the electrical parameters (current) based on the OLED's resistance characteristics. By adjusting the drive current as a function of measured resistance, the system compensates for aging effects and maintains stable light output.
2Illumination intensity
If control device regulates current as function of OLED resistance, then illumination quality remains constant, but device complexity increases
Solution Approach 1:
The control device uses the OLED's own resistance characteristics as feedback to automatically adjust its drive current. The system is self-regulating, using the OLED's inherent aging behavior (increasing resistance) as the basis for automatic compensation without requiring external intervention or complex control algorithms.
3Illumination intensity
If current is increased to compensate for resistance, then brightness is maintained, but energy consumption increases
Solution Approach 1:
The control device applies just enough current increase to compensate for resistance changes and maintain brightness. Rather than excessively over-driving the OLED, the system calculates and applies the minimum necessary current adjustment based on measured resistance, optimizing energy efficiency while maintaining illumination quality.
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 solution ensures consistent electromagnetic radiation intensity and brightness over the OLED's long lifespan, making it suitable for diverse applications including general illumination and industrial uses.
Implementation Method 1
as the electric resistance of the organic light-emitting diode increases, the control device will increase the amount of current that flows through the organic light-emitting diode
Implementation Method 2
The control device is capable of regulating the current through the organic light-emitting diode as a function of the organic light-emitting diode's resistance
Implementation Method 3
the organic light-emitting diode includes, for example, at least one active layer of an organic material suitable to generate radiation
Data Source
AI summary
An illumination device is described that includes a light source that is an organic light-emitting diode and a control device capable of adjusting the current through the organic light-emitting diode, which increases current as the electric resistance of the organic light-emitting diode increases.