Polysiloxane Dam Encapsulation for Narrow Non-Display Areas
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Solution Overview
Problem
Existing display devices face challenges in achieving a narrow non-display area while maintaining effective moisture permeation prevention, which is crucial for improving immersion and aesthetics.
Innovation Solution
The display device incorporates a substrate with a display area and a narrow non-display area, featuring a lower inorganic encapsulation film, an organic encapsulation film, an upper inorganic encapsulation film, and a polysiloxane dam between the lower and upper inorganic encapsulation films in the non-display area. This configuration enhances moisture prevention and allows for a reduced non-display area width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the width of the non-display area is reduced to increase immersion and aesthetics, then the display device achieves better visual appearance and immersion, but the moisture permeation prevention performance deteriorates
Solution Approach 1:
The encapsulation structure is segmented into multiple functional layers: lower inorganic encapsulation film, organic encapsulation film, upper inorganic encapsulation film, and dam structure. This segmentation allows each layer to perform its specific function optimally, with the dam providing mechanical barrier function while the encapsulation films provide moisture barrier function, resolving the contradiction between narrow non-display area and moisture prevention
Solution Approach 2:
The encapsulation system uses composite materials combining inorganic films (providing excellent moisture barrier properties) and organic encapsulation material (providing flexibility and adhesion). The dam is formed using polysiloxane composite material that offers both mechanical strength and moisture resistance. This composite approach enables effective moisture prevention even in narrow non-display areas
2Reliability
If a dam structure is added to prevent moisture in the non-display area, then moisture permeation prevention performance is improved, but the device complexity increases
Solution Approach 1:
The dam structure is merged with the encapsulation films to form an integrated moisture prevention system. The dam is positioned between the lower and upper inorganic encapsulation films, combining mechanical barrier function with the encapsulation layers. This merging reduces overall structural complexity compared to having separate, independent barrier structures
Solution Approach 2:
The dam structure serves multiple functions: it provides mechanical barrier against moisture, supports the upper inorganic encapsulation film, and helps define the boundary between display and non-display areas. This multi-functionality reduces the need for additional specialized components, thereby reducing overall device complexity
Data Source
AI summary
A display device includes a substrate including a display area and a first non-display area around the display area; a light emitting element on the display area of the substrate in the display area; a lower inorganic encapsulation film on the substrate in the display area and the first non-display area; an organic encapsulation film on the lower inorganic encapsulation film; an upper inorganic encapsulation film on the organic encapsulation film; and a first dam between the lower inorganic encapsulation film and the upper inorganic encapsulation film in the first non-display area, wherein a first side surface of the first dam is in contact with the organic encapsulation film, and a second side surface of the first dam different from the first side surface of the first dam is in contact with the upper inorganic encapsulation film.