Transparent OLED Display Undercut Encapsulation for Delamination Resistance
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Solution Overview
Problem
The transparent organic light emitting display apparatus faces issues with delamination of the organic light emitting device due to inferior adhesion strength at the interface with other layers, particularly under physical deformations such as external shocks or bending forces, leading to reduced durability.
Innovation Solution
Incorporating an undercut area in the transmission area of the display apparatus, formed by filling an encapsulation layer, which enhances delamination resistance by providing a hook-shaped structure that maintains adhesion even under physical deformations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an organic light emitting device is used in a transparent display apparatus, then the display can achieve lightweight and slim size with excellent color realization and response speed, but the organic material layer has inferior adhesion strength to inorganic films or metal films, causing delamination under physical deformation
Solution Approach 1:
The patent introduces an undercut structure that extends the encapsulation layer laterally beneath the organic light emitting device layer. This dimensional change from a flat interface to a stepped profile with lateral extension creates mechanical interlocking, preventing delamination by distributing stress across a larger area and providing anchor points that resist physical deformation forces.
Solution Approach 2:
The encapsulation layer is segmented into multiple functional regions: a first region that directly contacts the organic light emitting device, a second region that forms the undercut structure extending laterally, and a third region that provides additional support. This segmentation allows each region to perform its specific function optimally, with the undercut region specifically designed to prevent delamination.
2Adaptability or versatility
If a transmission area is introduced to pass external light for transparency, then the display achieves transparent functionality, but the interface between the organic emitting portion and other layers becomes more vulnerable to delamination under external shocks or bending forces
Solution Approach 1:
The undercut structure adds a lateral dimension to the encapsulation layer, creating an L-shaped or stepped profile that extends beneath the organic light emitting device. This dimensional extension provides mechanical anchoring that prevents delamination at the vulnerable transmission area interfaces during bending or external shock events.
Solution Approach 2:
The encapsulation layer with undercut structure is designed beforehand to provide mechanical support and stress distribution at potential failure points. The extended undercut regions act as pre-positioned reinforcement zones that cushion against delamination before physical deformation occurs, ensuring durability is built into the structure from the design stage.
Data Source
AI summary
A transparent organic light emitting display apparatus can include a substrate including a pad area and a contact area, a light shielding layer disposed on the substrate, an active layer disposed on the light shielding layer, an insulating layer disposed on the active layer, a source electrode and a drain electrode disposed on the insulating layer, a pad electrode disposed on the insulating layer in the pad area, a contact electrode disposed on the insulating layer in the contact area, a planarization layer disposed on the contact electrode, an anode electrode layer disposed on the planarization layer, an emission layer disposed on the anode electrode layer, and a cathode disposed on the anode electrode layer and the emission layer.