Display Device Pad Connection Structure for Reliability
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Solution Overview
Problem
Existing display devices face challenges in efficiently connecting pads in non-display areas to display areas due to height differences and insulation layer thickness variations, leading to bonding defects and reduced reliability.
Innovation Solution
The display device incorporates pads and lines formed on different layers with insulation layers, using connection parts and protective layers to ensure electrical connectivity and prevent corrosion, thereby reducing bonding defects and improving reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pads and lines are formed on different layers with insulation layers, then electrical connectivity is achieved, but height differences and insulation layer thickness variations cause bonding defects
Solution Approach 1:
The patent transitions from a planar connection structure to a three-dimensional stacked structure with multiple layers. Pads and lines are formed on different layers (first layer and second layer) with insulation layers in between, enabling electrical connectivity through vertical stacking rather than horizontal routing. This dimensional change allows independent optimization of each layer's function while maintaining reliable bonding through precise alignment features.
Solution Approach 2:
The patent introduces connection parts as intermediary elements that bridge the gap between pads on one layer and lines on another layer. These connection parts serve as mediators that facilitate electrical connectivity across the insulation layer, resolving the bonding reliability issue by providing a controlled interface between different layers with standardized geometric features for precise alignment.
2Reliability
If connection parts are used to connect different layers, then electrical connectivity is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple functions into the connection parts: they serve as electrical conductors, alignment references, and bonding interfaces simultaneously. By combining these functions into a single integrated structure with standardized geometric features, the patent reduces overall device complexity while maintaining high contact reliability, rather than requiring separate components for each function.
Solution Approach 2:
The connection parts are designed with universal geometric features that serve multiple purposes: they provide electrical connectivity, enable precise alignment through standardized shapes, and facilitate reliable bonding. This multi-functionality reduces the need for additional specialized components, thereby reducing device complexity while improving contact reliability.
3Reliability
If pads are exposed through openings in insulation layers, then electrical connection is achieved, but pads are vulnerable to corrosion
Solution Approach 1:
The patent applies protective layers to pad surfaces before exposing them through openings in the insulation layers. This beforehand protection prevents corrosion by creating a barrier against environmental factors before the pads are exposed to air or moisture, thereby maintaining electrical connection reliability while protecting against harmful corrosion effects.
Solution Approach 2:
The protective layers serve as intermediary barriers between the exposed pad surfaces and the external environment. These layers mediate the interaction by allowing electrical functionality while blocking corrosive agents, thus resolving the contradiction between needing exposed pads for electrical connection and protecting them from corrosion.
Data Source
AI summary
A display device and organic light-emitting display device, the display device including a substrate; a first line on the substrate; a first pad electrically connected to the first line, the first pad being on a same layer as the first line; a second line on another layer different from the layer on which the first line is formed, an insulation layer being interposed between the first line and the second line; a second pad on a same layer as the first pad; and a connection part electrically connecting the second line and the second pad.