Separation Wall Structure for Organic EL Display Moisture Protection
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Solution Overview
Problem
In organic EL display devices, forming a common function layer separated into the display region and the through-hole side while avoiding moisture ingress is challenging due to the need for a vapor deposition method, which increases manufacturing costs, especially when using a reverse tapered structure that requires negative photosensitive materials.
Innovation Solution
A display device design featuring a separation wall with a frame-shaped wall base portion from the second interlayer insulating film and a resin layer that protrudes towards both the through-hole and display regions, allowing the common function layer to be cut apart at the circumferential ends, thereby separating it without using negative photosensitive materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a reverse tapered structure is used to form the common function layer separated into display region side and through-hole side, then the common function layer can be properly separated, but negative photosensitive material is necessary and manufacturing cost becomes high
Solution Approach 1:
The patent divides the second interlayer insulating film into a wall base portion and a resin layer, creating a segmented structure that enables the common function layer to be separated into display region side and through-hole side without requiring negative photosensitive materials. The wall base portion provides structural support while the resin layer forms the protruding separation wall structure.
Solution Approach 2:
The separation wall acts as an intermediary structure between the through-hole and the common function layer. By providing this intermediate structure with the wall base portion and resin layer, the patent enables proper separation of the common function layer without directly using negative photosensitive materials in the vapor deposition process.
2Adaptability or versatility
If through-holes are provided inside the display region to dispose camera and fingerprint sensor, then device functionality is enhanced, but moisture and other contaminants may flow into the display region through exposed common function layer
Solution Approach 1:
The patent applies preliminary anti-action by forming the separation wall structure before depositing the common function layer. The wall base portion and resin layer are configured to protrude toward both the through-hole side and display region side, creating a barrier that prevents moisture and contaminants from flowing into the display region through the through-holes before the common function layer is even formed.
Solution Approach 2:
The resin layer forms a thin film structure that extends over the through-hole opening, creating a flexible barrier that prevents moisture ingress while allowing the underlying through-hole structure to remain intact for device functionality.
3Ease of manufacture
If common function layer is formed continuously over through-holes and display region, then manufacturing process is simpler, but moisture can flow into display region through exposed layer
Solution Approach 1:
The patent segments the second interlayer insulating film into a wall base portion and a resin layer to form a separation wall structure. This segmentation creates a physical barrier that prevents moisture ingress while maintaining manufacturing simplicity, as the separation wall is formed using the same vapor deposition process without requiring additional negative photosensitive materials.
Solution Approach 2:
The separation wall structure serves as an intermediary barrier between the through-hole opening and the common function layer. The wall base portion and resin layer create this intermediate structure that blocks moisture pathways while allowing the common function layer to be formed continuously over the entire surface.
Data Source
AI summary
A separation wall is provided in a frame shape along a circumferential edge of a through-hole in a non-display region, in which the through-hole is formed, defined in an island shape inside a display region. The separation wall includes a wall base portion provided in a frame shape by a part of a second interlayer insulating film and a resin layer provided in an eave shape on the wall base portion to extend to a through-hole side and a display region side. Opening portions opening upward are provided on peripheries of the wall base portion on the through-hole side and the display region side in the second interlayer insulating film.