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 manufacturing, then the display device can achieve high brightness and fast lighting speed, but gas is generated and cannot be discharged, leading to reliability degradation
Solution Approach 1:
The patent extracts the gas discharge function by creating a dedicated opening in the passivation layer over the dummy electrode. This opening serves as a specific pathway for gas to escape from the encapsulation structure during manufacturing, separating the gas discharge function from the normal operational structure and preventing gas accumulation that would compromise reliability.
Solution Approach 2:
The opening in the passivation layer acts as an intermediary channel between the enclosed organic layers and the external environment. It provides a controlled interface for gas to transition from the trapped state within the stacked layers to the external atmosphere, facilitating safe gas discharge without compromising the protective function of the passivation layer elsewhere.
2Reliability
If an inorganic layer is stacked on the organic layer, then the display device achieves high luminous efficacy, but gas cannot be discharged to the outside
Solution Approach 1:
The patent removes the passivation layer material in a specific region over the dummy electrode to create an opening. This extraction of material provides a dedicated gas discharge pathway that does not interfere with the inorganic layer stacking on the organic layer, allowing both the high luminous efficacy and reliable gas discharge to coexist.
Solution Approach 2:
The passivation layer is designed with non-uniform properties: it is intact over the active display areas to provide protection and maintain structure, but it has a localized opening over the dummy electrode to enable gas discharge. This local differentiation allows the structure to simultaneously provide protection where needed and gas escape where required.
Data Source
AI summary
A display device can include a substrate having 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 can 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 can include a first opening disposed on the first dummy electrode.