OLED Display Encapsulation with Absorption Layer
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Solution Overview
Problem
Organic light emitting diode (OLED) displays face deterioration due to external moisture and oxygen penetration, which existing thin film encapsulation technologies inadequately address, leading to reduced lifespan and display defects.
Innovation Solution
The implementation of a thin film encapsulation layer with an adhesive layer and an absorption functional layer, including metals or metal oxides, on a flexible polymer substrate to enhance sealing and minimize dead space, thereby increasing the OLED's lifespan by effectively absorbing moisture and oxygen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a thin film encapsulation layer is used to protect the OLED, then the device structure is simplified and manufacturing is easier, but the sealing function is insufficient leading to moisture and oxygen penetration
Solution Approach 1:
The patent applies composite materials by combining the thin film encapsulation layer with an adhesive layer and an absorption functional layer containing metal or metal oxide. This multi-layer composite structure integrates the simplicity of thin film fabrication with enhanced sealing and moisture absorption capabilities, resolving the contradiction between ease of manufacture and reliability.
Solution Approach 2:
The absorption functional layer is selectively positioned at specific locations where moisture and oxygen penetration is most problematic. By concentrating protective functionality in critical areas rather than uniformly throughout the structure, the patent maintains manufacturing simplicity while improving sealing performance where it is most needed.
2Reliability
If the encapsulation layer is extended to improve sealing, then moisture and oxygen protection is enhanced, but the dead space around the display area increases
Solution Approach 1:
The absorption functional layer is strategically positioned to provide enhanced sealing only in critical areas where moisture and oxygen penetration occurs, rather than extending the encapsulation uniformly across the entire display area. This localized approach improves protection while minimizing the increase in dead space.
Solution Approach 2:
The patent extracts the moisture and oxygen absorption function into a separate absorption functional layer containing metal or metal oxide, distinct from the main encapsulation structure. This allows the encapsulation layer to maintain its original dimensions and display area while the absorbed harmful substances are contained in the functional layer, preventing dead space expansion.
3Ease of manufacture
If existing encapsulation methods are used, then the manufacturing process is simple, but the OLED deteriorates due to moisture and oxygen penetration
Solution Approach 1:
The patent creates a composite structure combining the thin film encapsulation layer with an adhesive layer and an absorption functional layer containing metal or metal oxide. This composite approach maintains the simplicity of thin film manufacturing processes while significantly extending OLED lifespan by actively absorbing moisture and oxygen that would otherwise cause deterioration.
Solution Approach 2:
The absorption functional layer is incorporated into the encapsulation structure before the OLED is exposed to the external environment. This preliminary protective action ensures that moisture and oxygen are absorbed before they can penetrate and damage the OLED, thereby extending device lifespan without complicating the manufacturing process.
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 improves the sealing function of OLED displays, extending their lifespan and reducing display defects by creating a multi-barrier system that delays moisture and oxygen penetration, while minimizing the increase in dead space around the display area.
Implementation Method 1
an absorption functional layer on the adhesive layer, the absorption functional layer absorbing at least one of oxygen and moisture
Implementation Method 2
an adhesive layer that covers an upper surface and a side of the thin film encapsulation layer
Implementation Method 3
a thin film encapsulation layer that covers the display portion
Data Source
AI summary
An organic light emitting diode (OLED) display includes: a first substrate; a display portion that is formed on the first substrate and includes a driving circuit portion and an organic light emitting diode; a thin film encapsulation layer that covers the display portion; an adhesive layer that covers an upper surface and a side of the thin film encapsulation layer; an absorption functional layer that is formed on the adhesive layer and absorbs at least one of oxygen and moisture; and a second substrate that is formed on the absorption functional layer.