Micro LED Electrode Passivation and Metal Stack for Wire Protection
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Solution Overview
Problem
Micro LED display devices face issues such as chemical damage to wires, short circuits due to foreign matter, and decreased reflectivity during manufacturing processes, which affect light emission efficiency and device yield.
Innovation Solution
A display device with a passivation layer made of inorganic material is used to protect wires on the substrate, and various metal stack structures are employed for the first electrodes and signal wires to improve light reflectivity and adjust resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If wires are exposed during manufacturing processes, then manufacturing flexibility is improved, but chemical damage to wires and short circuits occur
Solution Approach 1:
A passivation layer is formed to cover the wires before manufacturing processes begin. This preliminary protective action prevents chemical damage and short circuits during subsequent manufacturing steps while still allowing the wires to be accessed when needed through openings in the passivation layer.
Solution Approach 2:
The passivation layer acts as an intermediary protective barrier between the wires and the harmful manufacturing environment. It mediates by providing chemical protection while allowing controlled access through openings, thus resolving the contradiction between protection and manufacturing access.
2Use of energy by moving object
If reflectivity of wires is increased, then light emission efficiency is improved, but manufacturing complexity increases
Solution Approach 1:
The wire structure uses a composite material approach with multiple metal layers (first metal layer, second metal layer with higher reflectivity, and third metal layer). This composite structure achieves high light emission efficiency through the reflective second metal layer while managing complexity through a systematic multi-layer design.
Solution Approach 2:
The second metal layer with higher reflectivity is strategically positioned between the first and third metal layers to specifically address the light emission efficiency requirement. This local quality enhancement applies reflectivity improvement only where needed for light emission without unnecessarily complicating the entire wire structure.
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 protects wires from damage, prevents short circuits, enhances light emission efficiency by improving reflectivity, and adjusts the resistance of the wires, thereby improving the overall yield and efficiency of the display device production.
Implementation Method 1
a passivation layer covering the first electrode... protect wires disposed on the substrate using a passivation layer made of an inorganic material
Implementation Method 2
a light reflectivity of the second metal layer is greater than a light reflectivity of the first and third metal layers
Implementation Method 3
improve the light emission efficiency of a light-emitting element and control the resistance of wires by presenting various stack structures for wires disposed under the light-emitting element using various types of metals
Data Source
AI summary
The present disclosure provides a display device that includes an insulating layer disposed on a substrate. The display device further includes a plurality of first electrodes and contact electrodes disposed on the insulating layer. The display device further includes a plurality of light-emitting elements disposed on the plurality of first electrodes. The display device further includes a second electrode disposed on the plurality of light-emitting elements. The display device further includes a passivation layer covering the first electrode. The display device further includes a first opening hole at the passivation layer. The first opening hole extends through the passivation layer. The passivation layer has a first opening hole exposing a portion of an upper surface of the first electrode.