Common Voltage Line Openings for OLED Gas Discharge
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Solution Overview
Problem
Gas generated during the baking process of organic materials in the insulating layer of OLED displays can affect electrodes and wiring, leading to defects.
Innovation Solution
A display device design featuring a common voltage supply line with specific openings and a passivation layer, including dams and protection patterns, to facilitate gas discharge and protect electrodes and wiring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a continuous common voltage supply line is used without openings, then the wiring integrity and electrical connectivity are maintained, but gas generated during baking accumulates and causes defects in electrodes and wiring
Solution Approach 1:
The common voltage supply line is divided into multiple segments by forming openings at different positions along its length. This segmentation allows gas to escape from multiple locations during the baking process, preventing gas accumulation that would otherwise cause defects in electrodes and wiring while maintaining electrical connectivity through the remaining conductive portions.
Solution Approach 2:
The common voltage supply line is designed with a porous structure containing multiple openings of varying sizes and shapes. This porous configuration enables effective gas discharge during baking while preserving the structural integrity and electrical functionality of the supply line, resolving the contradiction between maintaining wiring integrity and allowing gas escape.
2Object-affected harmful factors
If openings are formed in the common voltage supply line to discharge gas, then gas discharge capability is improved, but the electrical connectivity and wiring integrity may be compromised
Solution Approach 1:
Different regions of the common voltage supply line are assigned different qualities through strategically positioned openings of varying sizes and shapes. Areas with higher gas generation potential have larger or more numerous openings, while areas requiring stricter electrical integrity have smaller or fewer openings. This local differentiation optimizes both gas discharge efficiency and wiring integrity simultaneously.
Solution Approach 2:
The parameters of the openings (size, shape, position, density) are optimized to achieve the right balance between gas discharge and electrical connectivity. By carefully controlling these parameters, the supply line can effectively discharge gas during baking while maintaining sufficient electrical conductivity and structural integrity for normal operation.
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.