Micro LED Transfer Layer Recess Design for Yield and Cross-Talk
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Solution Overview
Problem
The transfer yield of micro-LED matrices in RGB LED displays is low due to insufficient adhesion forces and cross-talk interference from overlapping light-emitting areas of adjacent micro-LEDs, resulting in color errors and unevenness.
Innovation Solution
A micro light-emitting component and matrix design featuring a transfer layer with recesses that deform to retain micro light-emitting diodes, using materials like benzocyclobutene adhesive or silicone, and optionally a sacrificial layer and support member to enhance adhesion and prevent overlap, along with a light-blocking layer to reduce cross-talk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesion (Van der Walls force, magnetic force) is used to transfer the micro-LED matrix, then the transfer process can be performed, but the adhesion force is insufficient resulting in low transfer yield
Solution Approach 1:
The transfer layer undergoes a state transformation from a first state (deformable) to a second state (retaining), changing its mechanical parameters to achieve sufficient retention force. This phase or state change allows the transfer layer to provide strong adhesion when needed while remaining flexible during the transfer process
Solution Approach 2:
The transfer layer is designed with dynamic properties, being transformable between different states. In the first state it is deformable to accommodate the micro-LEDs, and in the second state it becomes rigid to provide strong retention, allowing the system to adapt to different operational requirements
2Quantity of substance
If the gaps among micro-LEDs are very small to increase density, then more micro-LEDs can be packed, but light-emitting areas overlap due to scattering angles causing cross-talk interference and color errors
Solution Approach 1:
The transfer layer acts as an intermediary structure between adjacent micro-LEDs. By forming recesses that precisely accommodate each micro-LED, it provides mechanical isolation that prevents light from adjacent LEDs from interfering with each other, thereby eliminating cross-talk while maintaining high density
Solution Approach 2:
The transfer layer provides different local properties: it is deformable in the first state to allow precise positioning, and rigid in the second state to provide isolation. The recesses create localized structures that confine light emission paths, ensuring each micro-LED operates independently despite close spacing
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
Improves transfer yield and reduces cross-talk interference by providing a secure retention mechanism for micro-LEDs and minimizing light emission overlap, resulting in improved color accuracy and uniformity in displays.
Implementation Method 1
the transfer layer is deformed by the micro light-emitting diode to form the recess
Implementation Method 2
The adhesion, such as Van der Walls force and magnetic force for transferring the micro-LED matrix
Data Source
AI summary
Disclosed is a micro light-emitting component, a micro light-emitting diode, and a transfer layer. The transfer layer has a recess for receiving the micro light-emitting diode to permit the micro light-emitting diode to be retained by the transfer layer, and is transformable from a first state, in which the transfer layer is deformed by the micro light-emitting diode to form the recess, to a second state, in which the micro light-emitting diode received in the recess is retained by the transfer layer. Also disclosed are micro light-emitting component matrix and a method for manufacturing the micro light-emitting component matrix.