LED with Integrated Photodetector for Stable Light Output
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Solution Overview
Problem
Light emitting devices, such as LEDs, experience degradation in light output characteristics due to increased ambient temperature and extended use, leading to unstable performance.
Innovation Solution
A light emitting device configuration featuring a light emitting element and a light converting element, where the light emitting element is connected between two nodes and the light converting element is connected between other nodes, allowing for independent operation and bias adjustments based on detected light levels to maintain stable output. The device includes a substrate and impurity regions of different conductivity types, with conductive patterns and electrodes configured to optimize light transmission and conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light emitting devices operate for extended periods or in high ambient temperatures, then continuous light output is maintained, but light output characteristics degrade and become unstable
Solution Approach 1:
The patent implements a feedback mechanism where a light converting element (photodetector) detects the light output from the light emitting element, and this detected signal is used to adjust the bias applied to the light emitting element. This closed-loop feedback system continuously monitors and corrects light output variations, maintaining stable characteristics over extended operational periods and across different ambient temperature conditions.
2Reliability
If light output characteristics are stabilized through feedback control, then reliable performance is achieved, but device complexity increases due to additional components and control circuits
Solution Approach 1:
The patent merges the light emitting element and light converting element into a single integrated device structure. The light converting element is positioned to directly receive light from the light emitting element within the same device housing, eliminating the need for external sensors and complex control systems. This integration achieves stable light output control while minimizing additional device complexity.
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 configuration ensures stable light output characteristics by adjusting biases based on detected light levels, enhancing the device's performance and longevity.
Implementation Method 1
A light emitting device, such as a light emitting diode ("LED"), emits light as a result of electron-hole combination
Implementation Method 2
a light converting element electrically connected between a third node and a fourth node and bonded to the light emitting element to sense the light generated by the light emitting element
Data Source
AI summary
In a light emitting device and a fabricating method thereof are provide, wherein the light emitting device includes a light converting element, and a light emitting element positioned on the light converting element and including a first electrode, a light emitting structure and a second electrode, the first electrode formed on the light emitting element and having a first opening, the light emitting structure having a first conductive pattern of a first conductivity type, a light emitting pattern, and a second conductive pattern of a second conductivity type, which are sequentially stacked, and the second electrode formed on the second conductive pattern, wherein the light generated from the light emitting structure reaches the light converting element through the first opening.