Structured Layer Formation for Precise LED Chromaticity Control
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Solution Overview
Problem
Existing methods for forming layers on optoelectronic light-emitting devices are inefficient in achieving precise thickness and structure, leading to inconsistent emission properties and chromaticity distribution.
Innovation Solution
An apparatus comprising a delimiting device and a holding device is used to apply a flowable material, allowing for precise control of layer thickness and structure by maintaining a fixed distance between the delimiting device and the light-emitting device, with the delimiting device being removable after curing and featuring a limiting element to prevent material flow between regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a flowable material is applied to form a layer on the light-emitting device without a delimiting device, then the application process is simple, but the layer thickness and structure cannot be precisely controlled
Solution Approach 1:
A delimiting device is introduced as an intermediary component between the material application source and the light-emitting device. This delimiting device defines the boundaries and thickness of the layer by physically limiting the flowable material during application, thereby achieving precise layer control without requiring complex in-situ monitoring or adjustment systems.
Solution Approach 2:
The delimiting device is designed as a simple, removable component that can be discarded or reused after a single application cycle. This disposable approach avoids the need for expensive, complex precision positioning systems while still achieving the desired layer thickness control for each application process.
2Manufacturing precision
If the delimiting device is held at a fixed distance from the light-emitting device, then the layer thickness is precisely defined, but the apparatus becomes more complex
Solution Approach 1:
The holding device utilizes a flexible membrane or thin film structure that can be stretched or deformed to achieve and maintain the required distance between the delimiting device and the light-emitting device. This flexible approach simplifies the mechanical structure compared to rigid positioning systems while still providing precise thickness control.
3Adaptability or versatility
If the delimiting device is removed after curing, then the layer can be freely formed without restrictions, but the process requires additional steps
Solution Approach 1:
The delimiting device is removed after the material has cured rather than during application. This preliminary curing step allows the material to set into its final shape within the confined space, and the subsequent removal of the delimiting device releases any residual constraints. This sequence improves productivity by allowing the curing process to proceed uninterrupted while still achieving the desired layer flexibility.
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 approach enables the formation of layers with defined heights and structures, improving emission properties by ensuring a narrow chromaticity distribution and allowing for different color outputs from adjacent LEDs, enhancing the performance of optoelectronic semiconductor components.
Implementation Method 1
The layer to be formed can be formed in the space area between a surface of the light-emitting device and the delimiting device arranged above it, from flowable material, such as silicone or epoxy resin, which is brought into the space area from above. The delimiting device can be removed after the material has cured.
Data Source
AI summary
In an embodiment an apparatus includes a delimiting device and a holding device configured to hold the delimiting device at a distance above an optoelectronic light-emitting device and form a layer of a material provided in a flowable state between the delimiting device and the light-emitting device, wherein a bottom side of the delimiting device, which faces the light-emitting device, has a structuring so that a structure complementary to the structuring is producible on an upper side of the layer.