Display Pad Layout With Selective Insulation Against Moisture Lifting
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Solution Overview
Problem
Display devices face reliability issues due to moisture permeation, leading to lifting phenomena in high temperature and high humidity environments, which existing technologies have not adequately addressed.
Innovation Solution
A display device design featuring a substrate with a display area and a pad area, including first and second input pads, signal lines, and an organic insulating layer that covers edges of the signal lines and pads, exposing parts of them to prevent moisture permeation, thereby enhancing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the organic insulating layer covers the signal lines and pads completely, then insulation is improved, but moisture permeation resistance deteriorates
Solution Approach 1:
The organic insulating layer is selectively formed to cover only specific regions: the edges of signal lines and certain areas of pads, while leaving other regions exposed. This localized coverage approach provides insulation where electric field concentration occurs (at edges) while maintaining moisture permeation resistance through exposed regions, resolving the contradiction between insulation and moisture resistance
Solution Approach 2:
The organic insulating layer is divided into multiple discrete regions rather than forming a continuous coverage. Specifically, it covers edges of first signal lines, edges of second input pads, and parts of second signal lines, while leaving gaps between these regions. This segmentation allows simultaneous achievement of localized insulation and moisture venting pathways
2Stability of the object's composition
If the organic insulating layer covers more areas, then insulation performance is improved, but manufacturing complexity increases
Solution Approach 1:
The insulating layer is applied only to specific critical regions (edges of signal lines and pads) rather than uniform coverage across all surfaces. This localized approach reduces the total area requiring insulating material deposition and simplifies the manufacturing process while maintaining adequate insulation performance
Solution Approach 2:
Instead of providing complete coverage with the organic insulating layer, the patent applies partial coverage only where most needed (at edges and specific pad regions). This partial action approach reduces manufacturing complexity and material usage while achieving sufficient insulation performance for the device
Data Source
AI summary
A display device includes a substrate including a display area, and a pad area at one side of the display area, first input pads and second input pads at one side of the pad area above the substrate, signal pads in the pad area above the substrate, and under the first and second input pads in a plan view, first signal lines electrically connecting the signal pads and the first input pads in a one-to-many or many-to-many manner, second signal lines electrically connecting the signal pads and the second input pads in a one-to-one manner, and an organic insulating layer covering edges of the first signal lines so that at least a part of upper surfaces of the first signals lines is exposed.