Thermal Adhesion Transfer Substrate for Selective Micro-Object Release
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Solution Overview
Problem
Existing methods for transferring micro-objects, such as microLED chiplets, struggle with selective and arbitrary pattern transfer, leading to inefficiencies in manufacturing processes like microLED displays, as they often require permanent bonding and cannot handle defective chiplets effectively.
Innovation Solution
A transfer substrate with temperature-responsive adhesion elements that can selectively pick up and release micro-objects by modulating surface adhesion through thermal control, allowing for the transfer of specific subsets of micro-objects to a target substrate while maintaining high position registration and allowing for repeatable, reversible operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If permanent bonding methods are used to transfer micro-objects, then transfer reliability is improved, but adaptability and ability to handle defective chiplets deteriorate
Solution Approach 1:
The patent applies dynamics by making the adhesion property of transfer elements dynamically controllable through temperature changes. The adhesion elements transition between high adhesion state (for picking up micro-objects) and low adhesion state (for releasing micro-objects), enabling selective and reversible transfer operations that adapt to different process requirements including defective chiplet replacement
Solution Approach 2:
The patent changes the physical parameter of surface adhesion by controlling temperature. By heating or cooling the transfer substrate, the adhesion strength of transfer elements is modulated between different states, allowing selective pickup and release of micro-objects based on programmed temperature patterns without permanent bonding
2Productivity
If selective transfer of micro-objects is achieved, then manufacturing efficiency is improved, but device complexity increases
Solution Approach 1:
The patent segments the transfer substrate into multiple independently controllable transfer elements, each capable of being heated or cooled separately. This segmentation allows selective activation of only the transfer elements needed for a given operation, improving manufacturing efficiency while managing complexity through modular control
Solution Approach 2:
The transfer substrate is designed with multi-functionality by integrating both pickup and release capabilities in the same system through temperature control. The same transfer substrate can perform multiple operations (selective pickup, selective release, repositioning) without requiring separate dedicated tools, improving productivity while consolidating system 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
Enables efficient and precise transfer of micro-objects in arbitrary patterns, facilitating high-yield manufacturing by allowing selective replacement of defective chiplets without permanent bonding, thereby improving the process yield in microLED display production.
Implementation Method 1
Each of the transfer elements includes an adhesion element having a first surface adhesion at a first temperature and a second surface adhesion at a second temperature
Implementation Method 2
The transfer elements also each include a thermal element operable to change a temperature of the adhesion element
Data Source
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Figure 3
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AI summary
An apparatus includes a transfer substrate with two or more transfer elements. Each of the transfer elements includes an adhesion element having a first surface adhesion at a first temperature and a second surface adhesion at a second temperature. The second surface adhesion less than the first surface adhesion. Each transfer element has a thermal element operable to change a temperature of the adhesion element in response to an input. A controller is coupled to provide the inputs to the thermal elements of the two or more transfer elements to cause a subset of the transfer elements to selectably hold objects to and release the objects from the transfer substrate in response to changes between the first and second surface adhesion of the subset of the transfer elements