Display Pad Passivation Openings for Corrosion and Out-Gassing
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Solution Overview
Problem
Display devices using conductive materials are prone to corrosion from developing and cleaning solutions, leading to reliability issues and film displacement due to out-gassing, which affects electrical connections and brightness.
Innovation Solution
A display device design with a passivation layer that includes an opening area to allow gas release, preventing conductive material exposure to cleaning solutions and reducing corrosion, thereby maintaining electrical connection reliability and preventing film displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an insulating layer covers the conductive material to prevent corrosion, then corrosion resistance is improved, but film displacement occurs due to gas out-gassing
Solution Approach 1:
The insulating layer is designed with a porous structure containing multiple voids that allow trapped gases to escape during the cleaning process. This prevents gas accumulation that would otherwise cause film displacement, while the layer maintains its corrosion protection function. The porous structure enables gas permeability without compromising the protective barrier against cleaning solutions.
Solution Approach 2:
The insulating layer exhibits different local properties: it is impermeable to cleaning solutions (protective) while being permeable to gases (ventilative). This local quality differentiation allows the same layer to simultaneously prevent corrosion and accommodate gas out-gassing, resolving the contradiction between protection and displacement prevention.
2Ease of manufacture
If the conductive material is exposed to cleaning solutions for thorough cleaning, then cleaning effectiveness is improved, but corrosion of the conductive material occurs
Solution Approach 1:
The insulating layer serves as an intermediary barrier between the conductive material and the cleaning solution. It allows the cleaning solution to access and clean the conductive material through its porous structure while preventing direct contact that would cause corrosion. This mediator enables thorough cleaning without compromising the conductive material's integrity.
Solution Approach 2:
The porous structure of the insulating layer allows cleaning solutions to penetrate through to the conductive material for effective cleaning, while the material composition and structure prevent corrosive interactions. The pores enable fluid passage but block harmful chemical effects on the conductive material.
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
The solution enhances the reliability of electrical connections and maintains brightness while reducing power consumption by preventing corrosion and film displacement.
Implementation Method 1
the insulation layer may release gases by out-gassing. The gases released by the out-gassing may degrade the adhesion between the conductive material and the insulating layer, causing film displacements.
Data Source
AI summary
A display device may include a substrate including a display area and a non-display area outside the display area, a pixel driving circuit on the display area of the substrate, a plurality of light-emitting elements disposed on the pixel driving circuit and electrically connected to the pixel driving circuit, a plurality of pad electrodes on the non-display area of the substrate, and a passivation layer on the plurality of pad electrodes of the non-display area and the display area, and the passivation layer may include a first opening area between a pair of pad electrodes of the plurality of pad electrodes in the non-display area.