Micro LED Insulation Layer for Short-Circuit-Free Flip-Chip Alignment
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Solution Overview
Problem
Micro LED display devices face issues with short circuits and skew disposition due to gapless electrode bumps and poor connection strength when micro LED units are disposed on substrates via the flip chip process, leading to degraded display quality and connection precision.
Innovation Solution
A micro LED display device is developed with a substrate, micro LED units, and a transparent insulation layer that covers conductive pads and connecting portions, filling the gap between electrodes and providing a liquid damping effect to prevent short circuits and ensure precise positioning, using a manufacturing method involving a covering, disposing, removing, and curing process to form the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If micro LED units are disposed on substrate via flip chip process, then volume of display device is reduced, but short circuit is easily induced due to gapless electrode bumps
Solution Approach 1:
A transparent insulation layer is introduced as an intermediary substance between the electrode bumps of adjacent micro LED units. This insulation layer fills the gaps between bumps and provides electrical isolation, preventing short circuits while maintaining the compact flip chip structure. The layer is applied before bonding and cured to form a stable insulating barrier.
2Manufacturing precision
If micro LED units are disposed with smaller grain length, then display resolution is improved, but skew disposition is easily induced causing degradation of display quality
Solution Approach 1:
The transparent insulation layer is applied to the substrate before the micro LED units are bonded. This preliminary application creates a uniform reference plane and positioning matrix that guides the placement of small-grain micro LED units, preventing skew disposition and ensuring accurate alignment even at high resolutions.
3Manufacturing precision
If micro LED units are disposed with smaller grain length, then display resolution is improved, but connection strength between units and substrate deteriorates
Solution Approach 1:
The transparent insulation layer is applied before bonding to provide a stable foundation and positioning reference. This preliminary structure supports the small-grain micro LED units during the bonding process, ensuring proper alignment and enabling reliable electrical and mechanical connections despite the reduced size of individual units.
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
The solution effectively prevents short circuits and skew disposition, enhancing connection strength and precision between micro LED units and the substrate, thereby improving display quality and luminous efficiency.
Implementation Method 1
providing a liquid damping effect to prevent short circuits
Implementation Method 2
the transparent insulation layer is cured, and the transparent insulation layer covers the micro LED units
Data Source
AI summary
A micro LED display device includes a substrate, micro LED units and a transparent insulation layer. The substrate includes conductive pads and conductive connecting portions. The conductive pads are disposed on the substrate. Each of the micro LED units includes a semiconductor epitaxial structure and electrodes. The electrodes are disposed on the semiconductor epitaxial structure, and each of the electrodes is connected to one of the conductive connecting portions adjacent to each other. The transparent insulation layer is disposed on the substrate and covers the conductive pads, the conductive connecting portions and the micro LED units, and the transparent insulation layer is filled between the electrodes of each of the micro LED units. The transparent insulation layer relative to a surface on each of the semiconductor epitaxial structures is of a first thickness and a second thickness, and the first thickness is different from the second thickness.