Micro-LED Assembly Hole Layout for Stable Wiring Connections
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Solution Overview
Problem
The challenge of aligning ultra-small light emitting devices in high-resolution display panels is exacerbated by narrow gaps between assembling wirings, leading to electrical disconnection and lighting defects, which are difficult to resolve without compromising resolution.
Innovation Solution
The implementation of second holes in the insulating layer extending laterally from the first hole, allowing connection electrodes to be disposed along the perimeter of the semiconductor light emitting device, ensuring stable electrical connections and improved adhesion, thereby preventing electrical disconnection and enhancing assembly reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the gap between assembling wirings is reduced to increase resolution, then the display resolution is improved, but the electrode wiring cannot be disposed and electrical disconnection occurs
Solution Approach 1:
The patent transitions from planar electrode wiring to three-dimensional connection electrodes that extend vertically along the side surface of the light emitting device. This dimensional change allows electrical connection without occupying lateral space between assembling wirings, thereby maintaining high resolution while ensuring reliable electrical connection.
Solution Approach 2:
The connection electrode is nested within the assembly hole structure, with part of the electrode extending along the side surface of the light emitting device. This nested configuration allows the electrode to utilize the vertical space within the assembly hole rather than requiring additional lateral space, solving the space constraint problem.
2Reliability
If the assembly hole is enlarged to widen the gap for electrode wiring, then electrical connection is improved, but the display resolution deteriorates
Solution Approach 1:
Instead of enlarging the assembly hole horizontally, the connection electrode utilizes the vertical dimension by extending along the side surface of the light emitting device. This approach maintains the original assembly hole size (preserving resolution) while achieving reliable electrical connection through vertical extension.
Solution Approach 2:
The connection electrode has different functional regions: one part makes contact with the bottom of the assembly hole for electrical connection, while another part extends along the side surface for mechanical support and additional electrical contact. This localized functional differentiation allows the electrode to achieve reliable connection without requiring a larger assembly hole.
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 approach prevents lighting defects, improves assembly reliability, and ensures uniform voltage supply, resulting in enhanced image quality and increased assembly rates.
Implementation Method 1
A display device displays high-definition image using self-emissive device such as a light emitting diode as a light source for a pixel
Data Source
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AI summary
The display device can include a substrate, a first insulating layer on the substrate, first and second assembling wirings on the substrate, a second insulating layer disposed on the first and second assembling wirings and having a first hole and at least one or more second hole extending in a lateral direction of the first hole, a semiconductor light emitting device in the first hole, and a connection electrode in the second hole.