OLED Barrier Film Groove Pattern Adhesion
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Solution Overview
Problem
Organic light emitting diode (OLED) display devices are susceptible to moisture and oxygen penetration, which deteriorates their quality, and existing methods to prevent this often result in increased thickness and complexity, making it difficult to achieve a slim form factor.
Innovation Solution
A barrier film with an inorganic and organic barrier layer structure is used, featuring a groove pattern on the inorganic barrier layer to increase the interface area with the adhesive agent, effectively preventing moisture and oxygen penetration while maintaining a slim thickness, and a manufacturing method involving alternate lamination of these layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a barrier film is added to prevent moisture and oxygen penetration, then protection against moisture and oxygen is improved, but device thickness increases
Solution Approach 1:
The barrier film uses a composite structure with alternating inorganic barrier layers (high moisture resistance) and organic buffer layers (stress relief and coverage of substrate defects). This composite approach achieves superior moisture blocking performance while maintaining thin film thickness, resolving the contradiction between protection and thickness.
Solution Approach 2:
The barrier film is segmented into multiple thin alternating layers of inorganic and organic materials rather than using a single thick layer. This segmentation allows each layer to be optimized for its specific function while keeping the overall structure thin, thus preventing moisture penetration without significantly increasing device thickness.
2Ease of manufacture
If the barrier film structure is simplified, then manufacturing complexity is reduced, but moisture and oxygen blocking performance deteriorates
Solution Approach 1:
The patent optimizes specific parameters including the thickness of each inorganic and organic layer, the number of alternating pairs, and the deposition conditions. By carefully controlling these parameters, the barrier film achieves high moisture blocking performance through a relatively simple alternating layer structure that is straightforward to manufacture using sequential deposition processes.
3Reliability
If a thick barrier layer is used to prevent moisture penetration, then moisture resistance is improved, but device complexity and thickness increase
Solution Approach 1:
Instead of using a single thick barrier layer, the patent employs a composite structure of multiple thin alternating inorganic and organic layers. The inorganic layers provide moisture blocking while the organic layers relieve stress and cover substrate defects, achieving superior moisture resistance with a thinner, less complex overall structure.
Solution Approach 2:
The barrier function is segmented across multiple thin alternating layers rather than concentrated in one thick layer. This segmentation distributes the protective function throughout the film structure, reducing local stress and improving overall effectiveness while maintaining thin total thickness and simpler manufacturing.
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
The solution effectively suppresses moisture and oxygen penetration, achieving a water vapor transmission rate of 10−6 g/m2/day and allowing for a slim, efficient OLED display device with improved use efficiency.
Implementation Method 1
effectively suppressing moisture and oxygen from penetrating an organic emission layer by using a barrier film
Implementation Method 2
an adhesive agent disposed between the neighboring area of the substrate body and the barrier film
Data Source
AI summary
An organic light emitting diode display device includes a substrate body that is divided into a display area and a neighboring area; an organic light emitting diode formed in the display area of the substrate body; a barrier film that is attached to the substrate body and covers the organic light emitting diode; and an adhesive agent disposed between the neighboring area of the substrate body and the barrier film. In addition, a groove pattern is recessed on one surface of the barrier film that is in contact with the adhesive agent.