Micro-LED Display Electrode Layout for Short-Circuit-Free Self-Assembly
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Solution Overview
Problem
Micro-LED displays face challenges in quickly and accurately transferring micro-LEDs to display panels due to corrosion of assembly wiring during the self-assembly process, leading to electrical short circuits and assembly defects, while also requiring high-resolution and efficient light extraction.
Innovation Solution
A display device design featuring alternately arranged assembly wiring with planarization layers and contact portions to minimize the process margin for forming contact parts, reduce the metal area of the second electrode, and prevent short circuits between pixel electrodes and light-emitting devices, while enhancing self-assembly and light extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If self-assembly method is used to transfer micro-LEDs, then transfer efficiency is improved, but assembly wiring corrosion occurs leading to electrical short circuits
Solution Approach 1:
The patent introduces a transfer electrode as an intermediary component between the assembly wiring and the micro-LED. The transfer electrode receives the micro-LED from the fluid environment through self-assembly, then transfers it to the final display position. This mediator prevents direct contact between corrosive fluid and the assembly wiring, eliminating corrosion while maintaining self-assembly efficiency.
2Reliability
If contact part area is increased to ensure reliable contact, then contact reliability is improved, but process margin is increased
Solution Approach 1:
The contact portion is pre-formed with optimized dimensions and positioning before final assembly. By establishing the contact geometry in advance during the planarization layer formation process, the patent ensures reliable electrical contact while minimizing the required process margin for alignment and assembly variations.
3Manufacturing precision
If metal area of second electrode is reduced for high resolution, then resolution is improved, but light extraction efficiency may be affected
Solution Approach 1:
The patent applies local quality by creating a contact portion with specific geometric features (inclined sides and concave regions) that concentrate light extraction functionality in localized areas. This allows the second electrode to have minimal overall metal area for high resolution while maintaining efficient light extraction through optimized local contact geometry where light interaction occurs.
4Reliability
If planarization layer is added to prevent short circuit, then short circuit prevention is improved, but device complexity is increased
Solution Approach 1:
The planarization layer serves multiple functions simultaneously: it provides electrical insulation to prevent short circuits between adjacent electrodes, creates a flat surface for precise micro-LED positioning, and forms the contact portion structure for electrical connection. By combining multiple functions in a single layer, the patent prevents short circuits without proportionally increasing device 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
The solution effectively minimizes defects, improves resolution, and reduces panel thickness by ensuring reliable contact formation and efficient light extraction, enhancing the reliability and performance of micro-LED displays.
Implementation Method 1
a light emitting device disposed inside the plurality of openings, the first electrode overlapping the first assembly wiring and the second assembly wiring
Data Source
AI summary
A display device according to the embodiment includes a substrate, a first assembly wiring and a second assembly wiring alternately arranged on the substrate and spaced apart from each other, a planarization layer disposed on the first assembly wiring and the second assembly wiring and having an opening and a contact portion, a light emitting device disposed inside the opening and having a first electrode overlapping the first assembly wiring and the second assembly wiring, and a pixel electrode disposed on the planarization layer and in contact with the second electrode of the light emitting device through a contact portion, and the plurality of contact units may overlap a portion of at least one side of the area where the light emitting device is disposed.