Electroluminescence Display Through-Hole Encapsulation
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Solution Overview
Problem
Electroluminescent display devices are vulnerable to moisture and oxygen permeation, which compromises their performance and longevity, especially when a through-hole is introduced in the display area.
Innovation Solution
The integration of a through-hole in the display area with an inner dam and a concave-convex pattern surrounding it, along with an encapsulation structure, prevents moisture permeation by partially cutting off the light emitting layer and using inorganic and organic encapsulation layers to seal the area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a through-hole is disposed in the display area, then the display area ratio is maximized, but moisture and oxygen permeation increases
Solution Approach 1:
The encapsulation structure is segmented into multiple layers including inorganic encapsulation layers and organic encapsulation layers, with the light emitting layer partially cut off around the through-hole. This segmentation creates multiple barriers to moisture and oxygen permeation while maintaining the through-hole in the display area.
Solution Approach 2:
The inner dam and concave-convex pattern act as intermediary structures between the through-hole and the light emitting element. These intermediaries provide additional protection against moisture and oxygen permeation, allowing the through-hole to be disposed in the display area without compromising the light emitting element.
2Reliability
If the light emitting layer is partially cut off to prevent moisture permeation, then moisture resistance is improved, but the display area is reduced
Solution Approach 1:
The light emitting layer is selectively cut off only in the local region around the through-hole, while remaining intact in other display areas. This local modification provides moisture resistance at the critical through-hole region without reducing the overall display area.
Solution Approach 2:
The light emitting layer is partially cut off rather than completely removed, providing sufficient moisture protection at the through-hole while maintaining display functionality in the surrounding areas. The partial action is exactly what is needed to solve the problem.
3Reliability
If an inner dam and concave-convex pattern are added around the through-hole, then moisture permeation is blocked, but device complexity increases
Solution Approach 1:
The inner dam and concave-convex pattern are merged into a single integrated encapsulation structure that performs both functions simultaneously. This merging reduces the number of separate components and simplifies the manufacturing process while maintaining effective moisture blocking.
Solution Approach 2:
The encapsulation structure including the inner dam and concave-convex pattern serves multiple functions: it provides mechanical support, blocks moisture and oxygen permeation, and maintains the structural integrity of the through-hole region. This multi-functionality reduces the need for additional separate components.
Data Source
AI summary
Disclosed is an electroluminescence display device having a through-hole in a display area thereof. The electroluminescence display device includes a substrate, a display area, a non-display area, a through-hole, an inner dam, and a concave-convex pattern. In the display area, a plurality of pixels, each of which includes a light emitting element that displays an image and a driving element that drives the light emitting element, are disposed on the substrate. The non-display area surrounds the display area on the substrate. The through-hole is disposed in the display area and does not include the substrate, the light emitting elements, and the driving elements. The inner dam surrounds the through-hole. The concave-convex pattern surrounds the through-hole between the through-hole and the inner dam.