LED Row Bank Structure With Insulating Layer for Electrode Protection
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Solution Overview
Problem
Existing display devices face challenges in preventing electrode damage during the formation of bank layers, which can lead to performance issues and reduced lifespan.
Innovation Solution
A display device with a novel stacked structure, featuring an insulating layer between the bank layer containing organic material and electrodes, thereby protecting the electrodes from damage during the bank layer formation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the bank layer is formed directly on the electrodes, then the manufacturing process is simpler, but the electrodes are damaged by the developer during bank layer formation
Solution Approach 1:
An insulating layer is introduced as an intermediary between the electrodes and the bank layer. This insulating layer prevents direct contact between the developer (used in bank layer formation) and the electrodes, thereby protecting the electrodes from damage while still allowing the bank layer to be formed. The insulating layer acts as a protective barrier that mediates the interaction between these two components.
Solution Approach 2:
The insulating layer is formed on the electrodes before the bank layer is deposited. This preliminary action of creating the protective insulating layer ensures that the electrodes are protected from subsequent processing steps, particularly the developer exposure during bank layer formation. The protection is established in advance before any potential damage can occur.
2Reliability
If the insulating layer is added between bank layer and electrodes, then electrode damage is prevented, but the device structure becomes more complex
Solution Approach 1:
The insulating layer serves multiple functions simultaneously: it provides electrical insulation between the electrodes and bank layer, protects electrodes from chemical damage during manufacturing, and can serve as an adhesive layer for subsequent material deposition. By combining multiple functions into a single layer, the design minimizes the increase in structural complexity while maximizing protective benefits.
Solution Approach 2:
The insulating layer is formed as a continuous, uniform layer across the electrode surface, providing consistent protection throughout. This homogeneous structure simplifies the overall design compared to more complex protective structures, as it requires only a single layer rather than multiple discrete protective components.
Data Source
AI summary
A display device includes a first electrode and a second electrode extending in a first direction and spaced apart from each other in a second direction, a first insulating layer disposed on the first electrode and the second electrode, a bank layer disposed on the first insulating layer and comprising an outer bank part extending in the first direction and the second direction and inner bank parts extending in the first direction in an area surrounded by the outer bank part, a second insulating layer disposed on the inner bank parts and the first insulating layer, and light emitting elements disposed on the second insulating layer between the inner bank parts, wherein each of the inner bank parts is connected to a part of the outer bank part extending in the second direction.