Display Electrode Pattern Layout for Low Resistance and High Transmittance
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Solution Overview
Problem
Display devices face challenges in enhancing light transmittance and reducing line resistance, while also preventing damage to contact electrodes during the etching process.
Innovation Solution
A display device design featuring a substrate with specific electrode and light-emitting element configurations, including multiple contact electrodes and insulating layers, which allows for improved light transmittance and reduced line resistance by optimizing the thickness and material properties of conductive layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple conductive layers are provided in the line area to reduce resistance, then line resistance is reduced, but device complexity increases
Solution Approach 1:
The patent applies composite materials by stacking multiple conductive layers (first conductive layer, second conductive layer, and third conductive layer) in the line area. Each layer has different material properties and thicknesses, creating a composite structure that reduces overall resistance while maintaining electrical signal transmission functionality.
Solution Approach 2:
The patent transitions from a single-plane conductive structure to a multi-layer vertical structure. By adding the third conductive layer that extends from the second conductive layer into the line area, the solution uses dimensional expansion (from 2D to 3D stacking) to reduce resistance without proportionally increasing lateral device complexity.
2Ease of manufacture
If the contact electrode is made of the same material as the first pattern, then manufacturing is simplified, but the contact electrode is damaged by etchant during etching process
Solution Approach 1:
The patent introduces an insulating layer as an intermediary protective barrier between the etchant and the contact electrode during the etching process. This insulating layer allows the etching to proceed safely without damaging the contact electrode, while still enabling subsequent removal to expose the contact electrode for electrical connection.
Solution Approach 2:
The insulating layer is formed on the contact electrode before the etching process begins. This preliminary protective action prevents etchant damage in advance, allowing the same material to be used for both the contact electrode and first pattern without compromising the contact electrode's integrity during manufacturing.
3Reliability
If the thickness of conductive layers is increased to reduce resistance, then line resistance is reduced, but light transmittance decreases
Solution Approach 1:
The patent applies different thickness specifications to different conductive layers based on their local functional requirements. The first conductive layer has a first thickness optimized for resistance reduction, while the second conductive layer has a second thickness optimized for light transmittance. This local differentiation allows each layer to perform its specific function optimally without compromising the other.
Solution Approach 2:
By creating a multi-layer composite structure with varying thicknesses and materials, the patent achieves a balance between electrical conductivity and optical transparency. The composite structure allows thicker layers where resistance reduction is critical while maintaining thinner layers where light transmittance is paramount.
Data Source
AI summary
A display device and a method of fabricating a display device are provided. The display device includes a substrate comprising a contact area and a line area, a first electrode that extends in a first direction on the substrate, a first electrode pattern that extends in the first direction and is spaced apart from the first electrode on the substrate, a second electrode that extends in the first direction and is between the first electrode and the first electrode pattern on the substrate, a second electrode pattern that extends in the first direction and is between the first electrode and the second electrode on the substrate, and a first light-emitting element between the first electrode and the second electrode pattern in the contact area.