Display Device Electrode Terminals Corrosion Protection
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Solution Overview
Problem
In display devices, the high density of electrode terminals with low resistivity and small size leads to increased corrosion risk, especially in humid and high-temperature environments, causing reliability issues with circuit connections.
Innovation Solution
The display device design includes electrode terminals with an insulating film and surface conductive films extending beyond the circuit electrode terminals' edges, reducing moisture infiltration and enhancing bonding strength through recessed insulating film structures, ensuring the peripheral edges of surface conductive films cover the circuit electrode terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrode terminals are disposed in high density with small size to achieve high definition, then display quality is improved, but corrosion resistance deteriorates
Solution Approach 1:
A protective film is formed to cover the electrode terminals, providing a barrier against moisture and corrosive substances. This thin film structure protects the small, high-density electrode terminals without interfering with their electrical function, thus maintaining both high display quality and corrosion resistance.
Solution Approach 2:
The protective film acts as an intermediary layer between the electrode terminals and the external environment. It allows the electrode terminals to maintain their high-density configuration while providing protection against corrosion, effectively mediating between the conflicting requirements of miniaturization and durability.
2Device complexity
If peripheral edges of surface conductive films are positioned inside circuit electrode terminals, then connection structure is simplified, but moisture infiltration increases
Solution Approach 1:
The protective film extends in the vertical dimension (thickness direction) to provide coverage beyond the horizontal boundaries of the circuit electrode terminals. By utilizing the vertical dimension, the design achieves comprehensive protection without complicating the horizontal connection structure, effectively blocking moisture infiltration paths.
Data Source
AI summary
A display device includes: a substrate; electrode terminals for external connection; an insulating film on the respective electrode terminals, the insulating film provided with openings which expose part of the respective electrode terminals, the insulating film covering the other portion of the respective electrode terminals; surface conductive films which are disposed so as to correspond to the respective openings, and are connected to part of the respective electrode terminals; and a circuit board disposed so as to oppose the substrate, the circuit board including circuit electrode terminals which are connected to the surface conductive films through a conductive bonding member so as to oppose the respective openings, the surface conductive films extending from an inside of an opening corresponding thereto to a surface of an insulating film corresponding thereto, peripheral edges of the respective surface conductive films being positioned beyond a peripheral edge of a circuit electrode terminal corresponding thereto.