OLED Through Holes for Outgassing Discharge
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Solution Overview
Problem
Organic light emitting display devices face damage due to outgassing from organic insulation layers, which can lead to degradation, pixel shrinkage, and reduced lifespan, as existing methods for gas discharge are insufficient, especially when using siloxane-based materials that generate a significant amount of gas.
Innovation Solution
Incorporating through holes in the peripheral portions of electrodes and wiring within the organic light emitting display device to effectively discharge outgassing from the planarization and pixel defining layers, thereby preventing damage and maintaining device performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If organic insulation layers (planarization layer and pixel defining layer) are used to protect and planarize the switching element, then device protection and structural integrity are improved, but outgassing from these layers causes device damage, degradation, and reduced lifespan
Solution Approach 1:
The patent extracts the harmful gas generated during organic light emitting element operation by introducing through holes that extend from the first electrode through the pixel defining layer to the planarization layer. This allows the gas to be discharged from the device structure rather than accumulating and causing damage, directly addressing the outgassing problem while maintaining the protective function of the organic insulation layers
Solution Approach 2:
The patent creates a porous structure by forming through holes in the electrode and pixel defining layer, enabling gas permeability and discharge pathways. This porous configuration allows the organic insulation layers to maintain their protective function while accommodating gas release, resolving the contradiction between protection and outgassing damage
2Ease of manufacture
If siloxane-based organic materials are used in the planarization and pixel defining layers, then ease of manufacture and planarization quality are improved, but the amount of outgassing increases significantly
Solution Approach 1:
The patent converts the harmful effect of outgassing from siloxane-based materials into a manageable issue by designing through holes that facilitate gas discharge. The siloxane materials continue to provide excellent planarization and ease of manufacture, while the through holes transform the previously harmful gas accumulation into a controlled discharge process, effectively neutralizing the negative impact
Data Source
AI summary
An organic light emitting display device may include a switching element disposed on a substrate, a planarization layer covering the switching element, a first electrode disposed on the planarization layer and coupled to the switching element, a first through hole being defined in a peripheral portion of the first electrode, a pixel defining layer covering the peripheral portion of the first electrode to expose an emission portion of the first electrode, an organic light emitting layer disposed on the emission portion of the first electrode, and a second electrode disposed on the organic light emitting layer.