OLED Display Panel Reversed Spacer Peeling Prevention
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Solution Overview
Problem
Conventional OLED display devices experience peeling of the organic light-emitting layer due to low adhesive force, particularly in foldable devices where the peeling can spread and cause structural issues.
Innovation Solution
The use of a reversed spacer with a reversed-trapezoidal vertical cross-section and a bar shape, arranged in a zigzag pattern with discontinuous areas, enhances the adhesive force of the organic layer by forming a barrier layer that prevents peeling from spreading across the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional OLED structure is used, then the device achieves basic display functionality, but the organic layer peels off in folding areas due to low adhesive force
Solution Approach 1:
The patent introduces a bank insulation layer as an intermediary between the substrate and the organic layer. This bank insulation layer serves as a mediator that enhances the adhesive force and prevents direct peeling of the organic layer from the substrate, particularly in folding areas where stress concentration occurs.
Solution Approach 2:
The bank insulation layer is formed in advance before depositing the organic layer. This preliminary action creates a prepared surface with improved adhesion properties, preventing peeling issues before they can occur during device operation or folding.
2Reliability
If a dot-shaped reversed spacer is used, then peeling prevention is improved in some directions, but the ability to reduce or prevent peeling varies depending on the folding direction
Solution Approach 1:
The patent transitions from a symmetric dot-shaped reversed spacer to an asymmetric linear reversed spacer configuration. The linear spacer extends in a specific direction (first direction) and effectively blocks peeling propagation along that direction, providing directional control over peel prevention that adapts to the folding direction.
Solution Approach 2:
The bank insulation layer is divided into multiple segments with different orientations. Some segments extend in the first direction while others extend in the second direction (perpendicular to the first direction), creating a segmented structure that provides comprehensive peeling prevention in multiple directions.
Data Source
AI summary
Disclosed is an organic light-emitting diode display panel, which may effectively reduce or prevent spreading of the peeling of an organic light-emitting layer by using a bar-shaped reversed spacer, regardless of the direction in which the organic layer peels off. The organic light-emitting diode display panel may include a reversed spacer, which is disposed on a bank insulation layer having an opening and includes a reversed-trapezoidal cross section, the reversed spacer having a bar shape when viewed from the front side of the organic light-emitting diode display panel.