Conformable Interface Layer for LED Pick-and-Place Transfer
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Solution Overview
Problem
The miniaturization of light emitting diodes (LEDs) in display fabrication makes the precise picking and placing of LEDs without damage increasingly difficult due to their form factor, as existing technologies lack effective methods for adhesive attachment during transfer operations.
Innovation Solution
A conformable interface layer is formed on the LEDs using a conformable material that is selectively cured with light, allowing for adhesion with a pick-up head and subsequent transfer to a display substrate without damaging the LEDs, utilizing positive or negative photosensitive materials and a mask to control curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the form factor of LEDs is decreased, then the display resolution and density are improved, but the picking and placing of LEDs becomes increasingly difficult and damage risk increases
Solution Approach 1:
A conformable material layer is introduced as an intermediary between the LED die and the pick-up head. This layer provides a compliant interface that facilitates adhesive attachment during transfer operations, enabling reliable handling of miniaturized LEDs without direct mechanical contact that could cause damage
Solution Approach 2:
The physical and chemical properties of the interface between LED and pick-up head are changed by applying a conformable material layer with specific adhesive characteristics. The material's compliance and adhesion properties are optimized to enable reliable picking and placing of miniaturized LEDs
2Ease of operation
If a conformable material is applied over the LED die to facilitate adhesion, then the ease of picking and placing is improved, but the complexity of the manufacturing process increases
Solution Approach 1:
Multiple functions are merged into a single conformable material layer: it provides adhesion for pick-up head attachment, protects the LED die during transfer, and enables precise placement. This consolidation reduces the number of separate process steps and materials needed
Solution Approach 2:
The conformable material serves as a temporary carrier that is applied during the transfer process and then removed or left on the LED depending on the specific application requirements, enabling flexible process design
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 method enables the efficient and precise transfer of LEDs by forming a conformable interface layer that facilitates adhesion with pick-up heads, allowing for accurate placement on display substrates without damaging the LEDs, enhancing the manufacturing process of electronic displays.
Implementation Method 1
Portions of the conformable material are exposed to light to selectively cure the portions of the conformable material over the light emitting surface of the LED die
Data Source
AI summary
Embodiments relate to forming a conformable interface layers (clayers) on small semiconductor devices, such as light emitting diodes (LEDs) to facilitate adhesion with a pick-up head for operations during the manufacturing of an electronic display. A conformable material is formed in regions between LED dies on a carrier substrate and over the LED dies. A mask is applied over the conformable material to selectively cover the conformable material. Portions of the conformable material are exposed to light to selectively cure or not cure the portions of the conformable material. The conformable material between the LED dies is removed to form a conformable interface layer over each of the LED dies.