OLED Display Module Thin Film Encapsulation Structure
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Solution Overview
Problem
Conventional OLED modules are thick and heavy due to the need for glass substrates to protect the organic material from moisture and oxygen, which also makes them prone to breakage when adhered to electronic devices.
Innovation Solution
A display module design featuring a transparent cover and a first protection film, with the OLED device placed between them, where the OLED device's area is smaller than the cover and film areas, providing protection from moisture and oxygen while reducing thickness and weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If glass substrates are used to protect OLED modules from moisture and oxygen, then protection performance is improved, but thickness and weight increase
Solution Approach 1:
The patent replaces thick glass substrates with thin film encapsulation layers (first and second protection films) that provide moisture and oxygen barrier functionality. These thin films achieve the required protection performance while significantly reducing the thickness and weight of the overall module structure.
Solution Approach 2:
The patent employs composite encapsulation structures combining multiple thin film layers with different material properties to create a protective barrier. This composite approach provides effective moisture and oxygen protection while maintaining minimal thickness and weight compared to single thick glass substrates.
2Reliability
If glass substrates are used to protect OLED modules from moisture and oxygen, then protection performance is improved, but the module becomes prone to breakage
Solution Approach 1:
The patent replaces brittle glass substrates with flexible thin film protection layers that inherently resist breakage. These thin films maintain protection performance while eliminating the breakage issue associated with glass, making the module more durable for mobile applications.
Solution Approach 2:
The patent changes the material parameters from rigid glass to flexible thin film materials, fundamentally altering the mechanical properties of the protective layer. This parameter change eliminates breakage while maintaining the protective function against moisture and oxygen.
3Reliability
If glass substrates are used to protect OLED modules, then protection performance is improved, but manufacturing complexity increases
Solution Approach 1:
The patent merges the protection function into integrated thin film encapsulation layers that are formed as part of the module structure itself, eliminating the need for separate glass substrate handling and assembly steps. This integration simplifies the manufacturing process while maintaining protection performance.
Solution Approach 2:
The use of thin film encapsulation layers simplifies the assembling process compared to glass substrates, as these thin films can be directly formed on the OLED device without requiring complex glass handling, positioning, and sealing procedures.
Data Source
AI summary
A display module and a fabricating method of the display module are provided. The display module includes a transparent cover, a first protection film, and an organic light-emitting display (OLED) device. The OLED device is disposed between the transparent cover and the first protection film. An area of the OLED device is smaller than an area of the transparent cover and an area of the first protection film.