Segmented Adhesive Layers for Miniature LED Transfer Precision
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Solution Overview
Problem
The increasing demand for higher resolution in LED display devices requires precise and efficient transfer of miniature LEDs, which is challenging due to the need for precise handling and adherence of small semiconductor elements with electrodes and conductive bumps during the transfer process.
Innovation Solution
A semiconductor element arrangement structure is developed, featuring a carrier substrate with separated adhesive layers that directly contact the electrodes and conductive bumps of the semiconductor elements, allowing for precise positioning and transfer by controlling the width and shape of the adhesive layers to ensure stable adhesion and efficient detachment from the primary substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the LED size is continuously reduced to fulfill higher resolution requirements, then the display resolution is improved, but the precision and efficiency of transferring miniature LEDs deteriorates
Solution Approach 1:
The adhesive layer is segmented into multiple discrete adhesive regions, each corresponding to a specific LED element. This segmentation allows for independent adhesion control of each LED, improving transfer precision while maintaining high display resolution. The adhesive regions are spatially separated and have different adhesion strengths to facilitate precise picking and placing of miniature LEDs.
Solution Approach 2:
Different regions of the adhesive layer are designed with different adhesion properties. The adhesive regions have stronger adhesion to hold LEDs during transfer, while non-adhesive regions allow for easy release. This local differentiation of adhesion quality enables precise handling of miniature LEDs without compromising transfer efficiency, thereby resolving the contradiction between display resolution and manufacturing precision.
2Measurement precision
If the number of LEDs required in a single display device is increased, then the display resolution is improved, but the complexity of transferring and arranging LEDs increases
Solution Approach 1:
Multiple adhesive regions are integrated into a single adhesive layer structure on one carrier substrate. This merging allows numerous LEDs to be arranged and transferred in an organized manner, reducing the complexity of handling each LED individually. The unified adhesive layer provides a systematic approach to managing large numbers of LEDs, facilitating efficient transfer processes while achieving high display resolution.
Solution Approach 2:
The adhesive regions are pre-formed on the carrier substrate before LED placement. This preliminary preparation of the adhesive structure enables systematic arrangement of LEDs in their final display configuration, reducing the complexity of the transfer process. By pre-establishing the adhesive framework, the transfer of numerous LEDs becomes more organized and efficient, addressing the contradiction between increased LED count and process complexity.
3Reliability
If the adhesive layer width is increased to improve adhesion stability, then the adhesion strength is improved, but the precision of LED positioning deteriorates
Solution Approach 1:
The adhesive layer is divided into multiple narrow adhesive regions rather than one wide continuous layer. Each adhesive region provides sufficient adhesion stability for its corresponding LED while maintaining narrow dimensions that enable precise positioning. This segmentation resolves the contradiction by allowing adhesion strength to be distributed across multiple focused regions rather than diluted in a single wide layer.
Solution Approach 2:
The adhesive layer exhibits local quality variations with adhesive regions having high adhesion strength in specific localized areas, while non-adhesive regions provide spacing and positioning control. This local differentiation allows the adhesive regions to provide strong bonding where needed while the overall structure maintains precise LED positioning, resolving the contradiction between adhesion stability and positioning precision.
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 enhances the accuracy and efficiency of transferring semiconductor elements, such as LEDs, by maintaining structural stability and facilitating their precise placement on target substrates, thereby improving the production yield and operational stability of LED display devices.
Implementation Method 1
a first adhesive layer and a second adhesive layer respectively disposed on the carrier substrate and separated from each other, and a first semiconductor element and a second semiconductor element disposed on the first adhesive layer and the second adhesive layer, respectively. The first adhesive layer is in direct contact with the first and second electrodes, and the second adhesive layer is in direct contact with the third and fourth electrodes
Data Source
AI summary
A semiconductor element arrangement structure is provided. The semiconductor element arrangement structure includes a carrier substrate, first and second adhesive layers respectively disposed on the carrier substrate and separated from each other, and first and second semiconductor elements disposed on the first and second adhesive layers, respectively. The first semiconductor element has first and second electrodes on the same side of the first semiconductor element, and the second semiconductor element has third and fourth electrodes on the same side of the second semiconductor element. The first adhesive layer is in direct contact with the first and second electrodes, and the second adhesive layer is in direct contact with the third and fourth electrodes. The first adhesive layer has a first width between the first and second electrodes and has a second width not between the first and second electrodes that is less than the first width.