Display Electrode Contact Structure for Low-Resistance Connections
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Solution Overview
Problem
Existing display devices face issues with defects at contact portions of electrodes on different layers, leading to electrical connection failures and increased electrical resistance.
Innovation Solution
The display device incorporates electrodes made of different materials, with the electrode upper layer partially exposing the electrode base layer, and includes insulating layers to prevent damage and ensure electrical connectivity, using aluminum for the upper layer and a conductive material without aluminum for the base layer, with specific contact portions and connection electrodes to maintain electrical contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrode upper layer is made of aluminum and fully covers the electrode base layer, then the electrical conductivity is improved, but the electrode upper layer becomes exposed and damaged in subsequent processes
Solution Approach 1:
The electrode structure is segmented into two functional layers: an electrode base layer that provides structural support and electrical connection, and a thinner electrode upper layer that provides additional conductivity. The upper layer is intentionally made thinner and partially exposed to avoid damage while maintaining electrical performance.
Solution Approach 2:
Different regions of the electrode structure are given different properties: the base layer has greater thickness for structural integrity and connection reliability, while the upper layer has reduced thickness to prevent exposure damage. This local differentiation of layer thicknesses resolves the contradiction between conductivity and damage prevention.
2Object-affected harmful factors
If the electrode upper layer is made thinner to prevent exposure, then damage is reduced, but electrical resistance increases
Solution Approach 1:
The electrode is constructed as a composite structure with two layers of different materials and thicknesses. The base layer (first electrode layer) provides structural foundation, while the upper layer (second electrode layer) with aluminum or aluminum alloy enhances conductivity. This composite approach allows the thinner upper layer to provide sufficient conductivity without being damaged by exposure.
3Ease of manufacture
If a single-layer electrode structure is used, then the manufacturing process is simplified, but defects occur at contact portions of electrodes on different layers
Solution Approach 1:
The electrode is divided into two distinct layers formed in separate manufacturing steps. The base layer is formed first, followed by the upper layer. This segmentation allows each layer to be optimized for its specific function and enables precise control of contact portions, eliminating defects while maintaining manufacturing feasibility.
Solution Approach 2:
The electrode base layer is formed in advance before the upper layer is deposited. This preliminary formation of the base layer with its specific pattern and material properties enables subsequent precise formation of the upper layer, ensuring proper contact portions and eliminating connection defects.
Data Source
AI summary
A first electrode upper layer of an electrode upper layer of a display device and a second electrode upper layer are disposed to partially expose a top surface of the first electrode base layer and a top surface of the second electrode base layer, respectively. A first insulating layer of the display device includes contact portions partially exposing a top surface of the first electrode base layer, a top surface of the second electrode base layer, and a top surface of the pad electrode upper layer.