Organic EL Display Spacer Wall Prevents Lead Wire Breakage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In organic EL display devices with on-cell touch panels, the lead wires can break at the dam wall, and the sealing film coverage is compromised due to irregularities and foreign substances, leading to potential water intrusion and degradation of the organic EL elements.
Innovation Solution
The display device incorporates a spacer wall with protruding portions along the dam wall to prevent lead wire breakage and ensure proper sealing film coverage, featuring a substrate with a light-emitting element layer and a sealing film that includes an organic sealing layer in the display region and a picture-frame region with a wall body and spacer wall to manage the organic resin material and lead wires effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the dam wall is made relatively high to block organic material, then the organic sealing layer is effectively contained, but the lead wire may break on the top portion of the dam wall due to insufficient resist thickness
Solution Approach 1:
The wall body is divided into a dam wall and a spacer wall with different functions. The dam wall provides height for sealing containment, while the spacer wall provides a lower profile with protruding portions that prevent lead wire breakage. This segmentation allows each component to optimize its function without compromising the other.
Solution Approach 2:
The spacer wall is provided with localized protruding portions at specific positions where lead wires cross. These protruding portions create localized protective structures that prevent wire breakage only where needed, rather than requiring the entire wall to be modified. This local quality approach maintains sealing effectiveness while addressing the wire breakage problem at critical locations.
2Reliability
If the dam wall is made relatively high to block organic material, then the organic sealing layer is effectively contained, but the sealing film coverage fails due to irregularities and foreign substances on the dam wall
Solution Approach 1:
The wall body is segmented into a dam wall for containment and a spacer wall for protection. The spacer wall's protruding portions are positioned to prevent lead wire contact with irregularities on the dam wall, thereby preventing foreign substance formation and ensuring sealing film coverage precision.
Solution Approach 2:
The spacer wall acts as an intermediary structure between the lead wire and the dam wall. Its protruding portions create a protective barrier that prevents the lead wire from contacting irregularities and foreign substances on the dam wall surface, ensuring proper sealing film coverage while maintaining the dam wall's sealing function.
3Ease of manufacture
If a resist is provided on the top portion of the dam wall for wire patterning, then the lead wire can be patterned, but the resist cannot have sufficient thickness when the dam wall is high
Solution Approach 1:
The patterning function is separated from the containment function by dividing the wall into a dam wall and a spacer wall. The lead wire crosses the spacer wall at a lower elevation where sufficient resist thickness can be applied for proper patterning, while the dam wall maintains the necessary height for organic material containment.
Solution Approach 2:
The wall height parameter is varied along its length by introducing protruding portions on the spacer wall. This creates regions of different heights: the dam wall portion maintains high containment capability, while the spacer wall portion with protruding portions provides a lower profile suitable for resist application and wire patterning with adequate thickness.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration reduces the risk of lead wire breakage and water intrusion into the display region, ensuring the longevity and reliability of the organic EL elements by maintaining effective sealing and preventing coverage failures.
Implementation Method 1
The inorganic sealing layer is formed by, for example, plasma chemical vapor deposition (CVD).
Implementation Method 2
organic electroluminescence (EL) display devices using organic EL elements
Data Source
AI summary
An organic EL display device has a picture-frame region provided with: dam walls extending along an outer periphery of a display region to block an organic sealing layer; and a second lead wire running from toward the display region, crossing the dam walls, and extending out of the picture-frame region. The picture-frame region includes a spacer wall extending along the dam wall and provided to an outer periphery of a portion, of the dam wall, intersecting at least with the second lead wire. The spacer wall has an upper portion provided with a plurality of protruding portions at intervals along the spacer wall. The second lead wire extends to cross a portion of, the spacer wall, away from the protruding portions.