Reflective Electrode Connections for Lower Display Contact Resistance
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Solution Overview
Problem
Existing display devices face issues with electrical characteristics deterioration due to high contact resistance between electrodes, which affects the overall performance and efficiency.
Innovation Solution
The display device incorporates a first connection electrode with a lower electrical resistance that overlaps and covers the connection pattern without direct contact, ensuring electrical connection while minimizing resistance, and a transparent conductive oxide electrode with a higher resistance that is connected through the first connection electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a direct contact connection is made between electrodes, then electrical connection is achieved, but contact resistance increases and electrical characteristics deteriorate
Solution Approach 1:
The patent introduces a connection electrode as an intermediary component between the first electrode and the connection pattern. This connection electrode has lower electrical resistance than the first electrode and provides a dedicated low-resistance pathway for electrical connection, thereby reducing the overall contact resistance in the electrical connection path while maintaining reliable electrical characteristics.
Solution Approach 2:
The patent changes the electrical resistance parameter by using materials with different resistance characteristics for different components. The connection electrode is specifically designed with lower electrical resistance compared to the first electrode, optimizing the electrical connection path. This parameter optimization resolves the contradiction by achieving both reliable electrical connection and reduced contact resistance.
2Illumination intensity
If a transparent conductive oxide electrode is used, then light transmission is improved, but electrical resistance increases
Solution Approach 1:
The patent segments the electrical connection path into multiple components with different functions: the first electrode (transparent conductive oxide) responsible for light transmission, and the connection electrode (low resistance material) responsible for electrical conduction. This segmentation allows each component to be optimized for its specific function, resolving the contradiction between light transmission and electrical resistance.
Solution Approach 2:
The patent applies local quality by using different materials with appropriate properties in different locations of the electrical connection path. The transparent conductive oxide is used where light transmission is critical (first electrode), while low-resistance metal materials are used where electrical conduction is critical (connection electrode). This localized material selection optimizes both light transmission and electrical resistance performance.
Data Source
AI summary
A display device includes: a first reflective electrode including a conductive material, an insulating layer partially covering the first reflective electrode, a first connection pattern disposed in a first contact hole of the insulating layer exposing at least a portion of the first reflective electrode and electrically connected to the first reflective electrode, a first connection electrode disposed on the insulating layer, electrically connected to the first connection pattern, and having a first electrical resistance, and a light emitting element including an electrode disposed on the insulating layer and the first connection electrode, electrically connected to the first connection electrode, and having a second electrical resistance greater than the first electrical resistance.