Display Panel Pad Structure for Crack-Resistant Layer Adhesion
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Solution Overview
Problem
Display panels face challenges in achieving improved reliability, particularly in the pad area, due to issues with conductive layer coverage and adhesion, which can lead to reliability degradation and increased risk of cracks and moisture ingress.
Innovation Solution
A display panel design featuring a substrate with a pad area that includes a first conductive layer covered by a first inorganic insulating layer with a contact hole, a second conductive layer in contact with the first through the hole, and a third conductive layer covered with a transparent conductive material layer, enhancing adhesion and resistance to deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a simple conductive layer structure is used in the pad area, then the manufacturing process is simpler, but the reliability deteriorates due to layer separation and crack formation
Solution Approach 1:
The patent applies composite materials by creating a multi-layer conductive structure in the pad area comprising a first conductive layer, second conductive layer, and third conductive layer with different material compositions. This composite structure enhances mechanical strength and adhesion while maintaining electrical conductivity, thereby improving reliability without significantly complicating the manufacturing process
Solution Approach 2:
The patent transitions from a planar two-dimensional conductive layer to a three-dimensional multi-layer structure by stacking conductive layers vertically with insulating layers in between. This dimensional change provides both mechanical support and electrical functionality, preventing layer separation and crack formation while maintaining manufacturing feasibility
2Strength
If transparent conductive material layer is added to cover the third conductive layer, then adhesion and resistance to deformation are enhanced, but device complexity increases
Solution Approach 1:
The transparent conductive material layer serves multiple functions simultaneously: it provides mechanical protection and adhesion enhancement, maintains electrical conductivity for signal transmission, and preserves optical transparency for display visibility. This multi-functionality justifies the added structural complexity by delivering multiple benefits from a single layer
Solution Approach 2:
The transparent conductive material layer is applied specifically to the pad area where enhanced adhesion and deformation resistance are most critical, rather than uniformly across the entire display panel. This localized application optimizes strength where needed while minimizing overall device complexity
Data Source
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AI summary
A display panel includes: a substrate including a display area, a non-display area outside the display area, and a pad area in the non-display area; a display portion in the display area and including a subpixel; and a pad portion in the pad area and including a pad, wherein the pad comprises: a first conductive layer on the substrate; a first inorganic insulating layer covering the first conductive layer and including a first contact hole exposing at least a part of the first conductive layer; a second conductive layer on the first inorganic insulating layer and in contact with the first conductive layer through the first contact hole; and a third conductive layer covering the second conductive layer, and an edge of the third conductive layer is covered with at least one transparent conductive material layer.