Micro LED Air-Layer Transfer Printing for Stable Sub-100 µm Gaps
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Solution Overview
Problem
The challenge in transferring micro LED chips onto a transparent glass substrate is the risk of defects due to minor errors causing mutual contact between the wafer substrate and the glass substrate, which requires maintaining a precise gap of less than 100 micrometers during the transfer process.
Innovation Solution
A micro LED selective air layer transfer printing device is designed with a laser light source, wafer stage, and glass substrate stage that includes a substrate lift mechanism and precise movement guides to minimize gap changes during the transfer process, using a laser light source with a beam path that adjusts power and shape to ensure uniform energy distribution and a substrate rotation system for precise positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If air gap print technology is used to transfer micro LED chips, then transfer speed and reliability are improved, but the risk of defects increases due to mutual contact between wafer substrate and glass substrate caused by minor errors in maintaining the gap
Solution Approach 1:
A buffer structure is introduced as an intermediary element between the wafer substrate and glass substrate. This buffer maintains the air gap during transfer, preventing direct contact between the substrates while still enabling the air gap print technology to function effectively for high-speed transfer
Solution Approach 2:
The buffer structure provides beforehand cushioning by pre-establishing a protective air gap between the wafer substrate and glass substrate. This cushioning effect prevents harmful contact during the transfer process, allowing the system to operate at high speeds without increasing defect rates
2Manufacturing precision
If the gap between wafer substrate and glass substrate is reduced to less than 100 micrometers, then transfer precision is improved, but the risk of mutual contact due to minor errors increases
Solution Approach 1:
The buffer acts as an intermediary that decouples the precision requirements. It allows the system to maintain a small gap for precision transfer while preventing contact through its buffer mechanism, effectively separating the precision function from the stability function
3Adaptability or versatility
If the wafer substrate and glass substrate are moved during transfer, then positioning flexibility is improved, but gap stability deteriorates due to movement-induced changes
Solution Approach 1:
The buffer structure serves as a movement-absorbing intermediary that allows the wafer substrate and glass substrate to move independently for positioning flexibility while maintaining stable gap conditions through its cushioning effect
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 solution effectively minimizes the change in the gap between the wafer and glass substrates, preventing defects and ensuring accurate transfer of micro LED chips onto the glass substrate, enhancing the reliability and efficiency of the transfer process.
Implementation Method 1
a laser light source part which irradiates laser light
Data Source
AI summary
A micro LED selective air layer transfer print device, includes: a laser light source part which irradiates laser light; a wafer part which is located under the laser light source part to receive the laser light irradiated from the laser light source part; and a glass substrate part, which is located under the wafer part and onto which micro LED chips of the wafer part are transferred, wherein the glass substrate part includes: a substrate stage which is located under the wafer part; and a substrate lift part which lifts the whole substrate stage or only a portion of the substrate stage.