Electro-optical Display Device Corrosion Protection
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Solution Overview
Problem
Existing electro-optical display devices, such as liquid crystal displays, face degradation due to corrosive gas intrusion through cut surfaces of flexible substrates, as previous protective measures like resin application and reinforcement plates fail to completely prevent gas intrusion.
Innovation Solution
The solution involves a substrate with a peripheral edge electrode, a protruding flexible circuit substrate with a second electrode, a reinforcement plate covering the connected electrodes, and a resin extending over the reinforcement plate's surface to create a protective layer that prevents corrosive gas intrusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resin is applied to protect electrodes and electronic components, then corrosion resistance is improved, but corrosive gas can still intrude through cut surfaces of flexible substrate
Solution Approach 1:
The reinforcement plate extends not only horizontally to cover the electrode connection but also vertically protrudes from the flexible substrate. This three-dimensional structure creates multiple protective barriers: the horizontal extension covers the electrode interface, while the vertical protrusion blocks corrosive gas from reaching the cut surfaces of the flexible substrate, thus addressing the limitation of conventional two-dimensional resin application.
Solution Approach 2:
The invention combines multiple materials with different functions: resin for basic corrosion protection, reinforcement plate (metal foil) for mechanical strength and additional gas barrier, and creates a composite protective structure. This multi-material approach leverages the complementary properties of each material to achieve superior protection against corrosive gas compared to single-material solutions.
2Strength
If reinforcement plate is added to prevent wiring breakage, then mechanical strength is improved, but corrosive gas intrusion through cut surfaces is not prevented
Solution Approach 1:
The reinforcement plate is designed with vertical protrusion from the flexible substrate in addition to horizontal extension. This dimensional extension transforms the plate from a purely mechanical reinforcement element into a multi-functional component that also serves as a gas barrier, blocking corrosive gas from reaching the vulnerable cut surfaces while maintaining wiring strength.
3Ease of operation
If flexible circuit substrate protrudes from substrate, then electrode connection is improved, but cut surfaces become exposed to corrosive gas
Solution Approach 1:
The reinforcement plate acts as an intermediary protective element between the flexible circuit substrate and the corrosive gas environment. It covers the electrode connection area to ensure electrical connectivity while its vertical protrusion creates a physical barrier that mediates the exposure of cut surfaces to corrosive gas, thus protecting the vulnerable interface.
Data Source
AI summary
An electro-optical display device according to the present invention includes a TFT substrate having a first electrode; a flexible circuit substrate extended in such a way as to protrude outwardly from the TFT substrate, wherein a second electrode is formed at the flexible circuit substrate and is connected to the electrode; a reinforcement plate which is extended from the TFT substrate to the flexible circuit substrate in such a way as to cover portions of the first electrode and the second electrode which are connected to each other and, further, is protruded from the flexible circuit substrate; and a resin formed to extend over a portion of a surface of the flexible circuit substrate which is protruded from the substrate, a portion of a surface of the reinforcement plate which is protruded from the flexible circuit substrate, and an end surface of the TFT substrate.