Segmented Undercoat Structure for Flexible Display Wiring
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Solution Overview
Problem
Existing display devices face challenges in achieving flexibility and designability, particularly in folding and bending, due to limitations in substrate materials and structural configurations that affect the reliability and yield of flexible display devices.
Innovation Solution
A display device structure featuring a flexible substrate with a specific undercoat and conductive film configuration, including a first and second undercoat with exposed regions of a conductive film, allows for the formation of terminals and wiring that enable flexible folding without compromising the electrical connections and structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flexible substrate is used to enable bending and folding, then the designability and flexibility of the display device are improved, but the reliability of electrical connections deteriorates due to stress on wiring during folding
Solution Approach 1:
The undercoat is divided into a first undercoat and a second undercoat that are spaced apart, creating a segmented structure. This segmentation allows the wiring to make contact with the conductive film at multiple discrete locations rather than as a continuous structure, reducing stress concentration during folding operations and improving connection reliability while maintaining flexibility.
Solution Approach 2:
The wiring contacts the conductive film in an intermediate region between the pixel and terminal, utilizing a spatial dimension that is not directly above or below but in between. This intermediate contact region allows the wiring to bypass high-stress areas and establish electrical connections in a location optimized for both flexibility and reliability.
2Stability of the object's composition
If the undercoat is made continuous to protect the conductive film, then the structural integrity is improved, but the ability to form reliable wiring connections deteriorates
Solution Approach 1:
The undercoat is segmented into first and second undercoats spaced apart from each other. This segmentation creates exposed regions of the conductive film between the undercoat portions, allowing the wiring to directly contact the conductive film for reliable electrical connections while the undercoat segments still provide structural protection where needed.
Solution Approach 2:
The undercoat structure exhibits local quality variation: it is present in regions requiring protection and absent in regions requiring electrical contact. The first and second undercoats are positioned to protect specific areas while leaving the intermediate region exposed for wiring connections, optimizing both structural integrity and connection reliability locally.
Data Source
AI summary
Disclosed is a display device including: a first conductive film over and in contact with a substrate; a first undercoat and a second undercoat over and in contact with the first conductive film; a pixel over the first undercoat; a wiring over the first undercoat, the first conductive film, and the second undercoat and in contact with the first conductive film between the first undercoat and the second undercoat. The first undercoat and the second undercoat are spaced from each other over the first conductive film and each cover a part of the first conductive film. The wiring is configured to form a terminal to which a signal for driving the pixel is input over the second undercoat.