Display Device Input Sensing Unit Corrosion Prevention
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Solution Overview
Problem
Display devices face reliability issues due to corrosion of electrodes and wires in the input sensing unit, particularly in bending regions, where oxidation reactions occur, leading to galvanic corrosion and deterioration at high temperatures and humidity.
Innovation Solution
The implementation of a display device with an input sensing unit featuring a first sensing insulating layer with a nitrogen to silicon atomic ratio of 0.69 to 0.85, which reduces oxidation reactions and corrosion by maintaining a specific film density and residual stress, and includes a bending protective layer to alleviate stress and enhance mechanical reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional insulating layer is used in the input sensing unit, then the device structure is simple, but corrosion of electrodes and wires occurs due to oxidation reactions, reducing reliability
Solution Approach 1:
The patent changes the chemical composition parameters of the insulating layer by controlling the nitrogen to silicon atomic ratio within 0.69 to 0.85. This parameter optimization reduces the oxidation reactivity of the insulating layer, thereby preventing galvanic corrosion of metal electrodes and wires while maintaining the basic layer structure without adding complex components.
Solution Approach 2:
The patent employs a composite insulating layer made of silicon nitride and silicon oxynitride materials. This composite structure combines the low oxidation reactivity of silicon nitride with the appropriate mechanical properties, creating a material that simultaneously prevents corrosion and maintains structural integrity without requiring additional protective layers.
2Reliability
If the insulating layer has high oxidation reactivity, then the manufacturing process is simple, but galvanic corrosion occurs in bending regions, deteriorating performance at high temperature and humidity
Solution Approach 1:
The patent optimizes the nitrogen to silicon atomic ratio parameter of the insulating layer to fall within 0.69 to 0.85. This specific parameter range achieves the dual objective of reducing oxidation reactivity to prevent galvanic corrosion while ensuring the insulating layer maintains appropriate mechanical properties and interlayer adhesion.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively prevents corrosion of electrodes and wires, improving the reliability and durability of the display device by reducing oxidation reactivity and maintaining interlayer adhesion, even under harsh conditions.
Implementation Method 1
oxidation reactions occur, leading to galvanic corrosion
Data Source
AI summary
Provided is a display device according to an embodiment including a display panel including a display region and a non-display region, and an input sensing unit disposed on the display panel, wherein the input sensing unit includes a first sensing insulating layer disposed on the display panel, and a first sensing conductive layer disposed on the first sensing insulating layer, and the first sensing insulating layer has an atomic ratio of nitrogen (N) to silicon (Si) of about 0.69 to about 0.85. Accordingly, corrosion of the electrode and wires due to the electric field when the input sensing unit is driven may be controlled. Accordingly, reliability of the display device may be improved.