Color Conversion Cartridge with Aligned Optical Layer Transfer
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Solution Overview
Problem
Current methods for integrating microdevices with optical structures into system substrates face challenges in effectively forming and transferring optical layers while ensuring proper alignment and protection, which affects the functionality and reliability of the microdevices.
Innovation Solution
The method involves holding microdevices on a substrate with a bonding layer, forming optical layers on top, and creating a passivation layer that covers the sidewalls, along with a protection layer that can extend to house the optical layers, allowing for precise alignment and transfer into a system substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If optical layers are formed on top of microdevices and transferred into a system substrate, then the functionality and reliability of microdevices are enhanced, but the complexity of the integration process increases
Solution Approach 1:
The patent applies preliminary action by forming optical layers on microdevices while they are still mounted on the donor substrate, before transfer to the system substrate. This includes depositing optical layers, forming passivation layers, and creating housing structures in advance, which simplifies the overall integration process by consolidating multiple steps before the critical transfer operation.
Solution Approach 2:
The patent implements nesting by integrating optical layers within housing structures that are formed by extending protection layers. The optical layers are positioned within these nested housing cavities, creating a compact integrated structure where multiple functional elements are contained within each other, reducing overall complexity.
2Reliability
If a passivation layer is formed to cover sidewalls of microdevices, then protection and alignment are improved, but the manufacturing process becomes more complex
Solution Approach 1:
The passivation layer serves multiple functions simultaneously: it protects the sidewalls of microdevices, provides alignment references for optical layer positioning, and forms part of the housing structure. This multi-functionality reduces the need for separate process steps, thereby simplifying manufacturing despite the added protection and alignment capabilities.
Solution Approach 2:
The patent merges the protection function and alignment function into a single passivation layer structure. The same layer that protects sidewalls also provides alignment features, combining multiple requirements into one manufacturing step, which improves ease of manufacture while maintaining reliability.
3Manufacturing precision
If protection layers are extended to create housing for optical layers, then alignment and protection are enhanced, but the device structure becomes more complex
Solution Approach 1:
The extended protection layers form housing structures that nest the optical layers within defined cavities. This nesting approach provides precise alignment by physically constraining the optical layers within the housing, while the modular nested structure actually simplifies the overall device architecture by integrating multiple components into a unified structure.
Data Source
AI summary
The present invention discloses development of microdevices with an optical structure on a substrate. In particular it discloses aspects of microdevices having sidewalls, top and bottom sides, and methods to create a housing or cavity using different processes. The processes use protection layers, patterning, and passivation as well as alignment techniques.