Common Voltage Line Openings for OLED Gas Venting Reliability
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Solution Overview
Problem
Gas generated during the baking process of organic materials in the insulating layer of OLED displays can cause defects in electrodes and wiring due to accumulation and inability to escape, affecting the performance and reliability of the display device.
Innovation Solution
Incorporating a common voltage supply line with specific openings and a passivation layer made of organic material, along with dams and protection patterns, to facilitate gas release and protect the electrodes and wiring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the insulating layer is made of organic material, then the device achieves low power consumption and high luminance, but gas is generated during baking that causes defects in electrodes and wiring
Solution Approach 1:
The patent extracts the harmful gas from the system by creating openings in the common voltage supply line, allowing gas to escape from the insulating layer during the baking process. This prevents gas accumulation that would otherwise cause defects in electrodes and wiring, while maintaining the benefits of organic insulating materials.
Solution Approach 2:
The common voltage supply line serves as an intermediary structure that performs dual functions: electrical conduction and gas venting. By incorporating openings in the supply line, it provides a designated pathway for gas escape, mediating between the gas-generating insulating layer and the external environment to prevent harm to other components.
2Reliability
If the common voltage supply line is made continuous without openings, then electrical conductivity is maintained, but gas accumulates and causes defects
Solution Approach 1:
The patent applies local quality by creating openings only in specific regions of the common voltage supply line where gas accumulation is most problematic, rather than making the entire supply line discontinuous. This maintains electrical conductivity in most areas while providing localized gas venting pathways to prevent defects.
3Reliability
If openings are added to the common voltage supply line, then gas can escape and defects are prevented, but the structural integrity and conductivity may be compromised
Solution Approach 1:
The patent transforms the common voltage supply line from a solid continuous structure to a porous structure with controlled openings. These openings allow gas to pass through while the remaining material maintains sufficient structural integrity and electrical conductivity. The supply line becomes a porous conductor that balances gas permeability with mechanical and electrical strength.
Data Source
AI summary
A display device according to an embodiment includes a substrate including a display area, a first peripheral area disposed outside the display area, and a second peripheral area disposed between the display area and the first peripheral area; a common voltage supply line disposed on the first peripheral area and the second peripheral area of the substrate; and a common electrode electrically connected to the common voltage supply line, wherein the common voltage supply line includes a first opening disposed in the first peripheral area; and a second opening disposed in the second peripheral area, and the first opening and the second opening are different in size or arrangement.