Light Extraction Layer Layout for LED Refraction and Heat Dissipation
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Solution Overview
Problem
Light emitting devices face challenges in maximizing light extraction efficiency and heat dissipation due to refractive index differences causing light diffusion and heat degradation, which affect light straightness and performance.
Innovation Solution
Incorporating a light extraction layer with a refractive index between that of air and the light transmitter, and a heat dissipater structure to minimize total reflection and enhance heat dissipation, while using specific materials for component stability and light path adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If light emitted from the light emitter enters the air through the light transmitter, then light transmission occurs, but the difference in refractive index causes light diffusion and reduces forward light efficiency
Solution Approach 1:
The patent introduces an intermediate layer between the light transmitter and air to bridge the refractive index gap. This intermediate structure gradually transitions the refractive index from the high-value light transmitter material to the low-value air, preventing sudden refraction and light diffusion, thereby improving light extraction efficiency while maintaining forward light directionality
Solution Approach 2:
The patent modifies the refractive index parameter by introducing materials or structures with intermediate refractive index values. By changing the optical parameter (refractive index) gradually rather than abruptly, the system reduces light diffusion loss and improves the amount of light successfully extracted into air
2Power
If heat is generated by the light emitting device, then light emission function is achieved, but heat deteriorates the performance of the light emitting device
Solution Approach 1:
The patent extracts heat from the light emitting device by introducing dedicated heat dissipation structures that separate the thermal management function from the light emission function. This allows the light emission to continue efficiently while the extracted heat is conducted away through separate thermal pathways, preventing performance deterioration
Solution Approach 2:
The patent creates additional thermal conduction pathways that replicate efficient heat transfer routes, allowing heat to be dissipated through multiple parallel paths rather than relying on a single thermal route, thereby improving overall heat dissipation capacity while maintaining device performance
3Productivity
If a light extraction layer is added to improve light extraction rate, then light efficiency increases, but device structure becomes more complex
Solution Approach 1:
The patent designs the light extraction layer to serve multiple functions simultaneously: it extracts light efficiently while also managing heat dissipation and maintaining structural integrity. This multi-functionality reduces the need for separate components, thereby improving light extraction rate without proportionally increasing device complexity
Solution Approach 2:
The patent merges the light extraction function with existing device structures or combines it with heat dissipation structures into an integrated component. By merging functions rather than adding separate elements, the system achieves improved light extraction while minimizing the increase in structural 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
Improves light extraction rate and heat dissipation efficiency, ensuring superior light straightness and stability in lighting applications.
Implementation Method 1
the light extraction layer has a third refractive index in a range between the first refractive index and the second refractive index
Implementation Method 2
configured to minimize the total reflection as the light from the light emitting device ultimately enters the air
Implementation Method 3
a structure for efficiently arranging a heat dissipater in the light emitting device to increase heat dissipation efficiency
Data Source
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AI summary
A light emitting device is provided for increasing light emission efficiency, and a vehicle lamp or lighting apparatus including the same. The light emitting device includes a light emitter, a light transmitter disposed on a first region corresponding to at least a portion of a top surface of the light emitter and configured to change a characteristic of light emitted from the light emitter, and a light extraction layer disposed on a top surface of the light transmitter. A refractive index of air corresponds to a first refractive index, a refractive index of the light transmitter corresponds to a second refractive index, and the light extraction layer has a third refractive index in a range between the first refractive index and the second refractive index.