Layered Display Electrodes With Contact-Hole Routing for Low RC Delay
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Solution Overview
Problem
Existing display devices face challenges with high contact resistance and RC delay in their electrodes, which affect the performance and efficiency of the display.
Innovation Solution
The display device incorporates a layered structure of electrodes with a first electrode layer made of aluminum and a second electrode layer made of molybdenum, where the first electrode layer has higher reflectivity and lower conductivity than the second, and a contact hole exposes the first electrode layer to the second electrode layer, allowing for improved electrical connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-layer electrode structure is used, then the device complexity is reduced, but the contact resistance and RC delay increase
Solution Approach 1:
The electrode is divided into multiple layers (first electrode layer and second electrode layer) with different material compositions and functions. The first electrode layer provides high reflectivity while the second electrode layer provides high conductivity, allowing each layer to optimize for its specific function rather than requiring a single material to compromise between conflicting requirements.
Solution Approach 2:
The patent employs a composite electrode structure where the first electrode layer (e.g., aluminum) and second electrode layer (e.g., molybdenum) are stacked together. This composite structure combines the advantageous properties of different materials - high reflectivity from the first layer and high electrical conductivity from the second layer - to simultaneously reduce contact resistance and RC delay while maintaining optical performance.
2Ease of manufacture
If a single-layer electrode structure is used, then the manufacturing process is simplified, but the RC delay increases
Solution Approach 1:
The electrode structure is segmented into multiple functional layers that can be deposited using standard sequential sputtering or evaporation processes. Each layer is deposited independently with controlled thickness and composition, allowing the manufacturing process to remain compatible with existing thin-film deposition equipment and techniques while achieving the dual benefits of reduced RC delay and optimized electrical performance.
Solution Approach 2:
The composite electrode structure integrates materials with complementary electrical properties - the first electrode layer (e.g., aluminum) contributes to signal reflection and the second electrode layer (e.g., molybdenum) provides low-resistance electrical pathways. This composite approach reduces RC delay by creating parallel conduction paths with lower overall resistance, while the manufacturing process remains feasible through conventional multi-layer thin-film deposition techniques.
3Illumination intensity
If the first electrode layer has high reflectivity, then the optical performance is improved, but the electrical conductivity decreases
Solution Approach 1:
The electrode function is segmented between two layers: the first electrode layer is optimized for optical reflectivity with materials like aluminum that have high reflective properties, while the second electrode layer is optimized for electrical conductivity with materials like molybdenum that provide low-resistance electrical pathways. This functional segmentation allows each layer to excel at its primary role without compromising the other.
Solution Approach 2:
The composite electrode structure combines materials with different dominant properties - the first electrode layer uses high-reflectivity materials (e.g., aluminum) to maintain optical performance, while the second electrode layer uses high-conductivity materials (e.g., molybdenum) to ensure low contact resistance and RC delay. The stacked composite configuration allows both optical and electrical requirements to be satisfied simultaneously by leveraging the complementary properties of the constituent materials.
Data Source
AI summary
A display device includes: a first light emitting element located between the first and second patterns; a first alignment electrode located on the first pattern, the first alignment electrode having a first inclined surface opposing the first light emitting element; a first connection electrode at a same layer as the first alignment electrode; and first and second electrodes electrically connected to respective end portions of the first light emitting element. Each of the first alignment electrode and the first connection electrode includes first and second electrode layers that are sequentially stacked. A contact hole exposing the first electrode layer of the first connection electrode is formed in the second electrode layer of the first connection electrode. The first electrode is in contact with the first electrode layer of the first connection electrode and a side surface of the second electrode layer of the first connection electrode through the contact hole.