Micro LED Passivation Opening for Gas Discharge Reliability
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Solution Overview
Problem
Display devices using micro LEDs face reliability issues due to gas generation during manufacturing, which cannot be effectively discharged, leading to degradation.
Innovation Solution
A display device design incorporating a substrate with a display area and non-display area, featuring first electrodes, light-emitting elements, and a passivation layer with openings over dummy electrodes, enhancing gas discharge and improving reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple layers containing organic materials are stacked during micro LED manufacturing, then the device structure is completed, but gas is generated and trapped causing reliability degradation
Solution Approach 1:
The patent extracts the harmful gas from the stacked layers by providing a dedicated discharge path. The opening in the passivation layer allows gas to be vented from the micro LED structure to the external environment, preventing gas accumulation that would otherwise degrade device reliability.
Solution Approach 2:
The passivation layer with an opening serves as an intermediary structure that manages the gas discharge process. It provides a controlled pathway for gas to escape while maintaining the integrity of the stacked layers and protecting other components from direct exposure to the discharged gas.
2Ease of manufacture
If an inorganic layer is stacked on the organic layer, then the device structure is formed, but gas discharge is blocked
Solution Approach 1:
The passivation layer is segmented by creating an opening that divides it into regions, allowing gas to pass through the opening while maintaining the protective coverage over the electrodes and other components. This segmentation resolves the conflict between maintaining layer structure and enabling gas discharge.
Solution Approach 2:
The passivation layer has different properties in different locations: it remains intact over most areas to provide protection, but has an opening in specific locations to allow gas discharge. This local differentiation enables simultaneous achievement of protection and gas venting.
Data Source
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AI summary
A display device according to an embodiment of the present specification may include a substrate including a display area and a non-display area, first electrodes disposed on the substrate, a light-emitting element disposed on each of the first electrodes, and a first passivation layer disposed on the first electrode. The first electrodes may include a first driving electrode disposed in the display area and a first dummy electrode disposed in the non-display area. The first passivation layer may include a first opening disposed on the first dummy electrode.