Multi-Layer Display Pad Structure for Stable Signal Transmission
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Solution Overview
Problem
Display devices face challenges in achieving improved electrical reliability and minimizing signal distortion, particularly in the pad and display areas, where existing technologies struggle to maintain consistent performance over time.
Innovation Solution
The proposed solution involves a display device with a specific pad structure comprising multiple pad patterns and a light emitting element, where the pad structure includes a first, second, and third pad pattern, and a display element part with a bank pattern and arranged electrodes, all fabricated using precise etching processes to ensure electrical connectivity and stability, and a manufacturing method that involves forming these patterns on a substrate to create a reliable electrical pathway.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional single-layer pad structure is used, then the device complexity is low, but the electrical reliability and signal stability deteriorate over time
Solution Approach 1:
The pad structure is divided into multiple layers (first pad pattern, second pad pattern, third pad pattern) stacked vertically. Each layer serves specific electrical functions, with the multi-layer configuration providing improved signal stability and reduced distortion compared to conventional single-layer pads, while maintaining manageable complexity through systematic layering
Solution Approach 2:
The invention transitions from a planar (2D) pad structure to a three-dimensional (3D) stacked structure by adding vertical layering. The first, second, and third pad patterns are arranged in the vertical direction, utilizing the Z-dimension to achieve better electrical performance without significantly increasing lateral footprint
2Reliability
If the second and third pad patterns are continuously contacted, then electrical connectivity is maintained, but signal distortion increases
Solution Approach 1:
The contact between second and third pad patterns is made selective and localized rather than continuous. Contact holes are formed at specific locations to establish electrical connection only where needed, allowing the structure to maintain connectivity while reducing signal distortion by avoiding unnecessary contact areas that could introduce interference
3Ease of manufacture
If aluminum is used for the third pad pattern and arranged electrode, then manufacturing cost is reduced, but oxidation and electrical stability worsen
Solution Approach 1:
A barrier layer is introduced as an intermediary between the aluminum pad patterns and the environment. This barrier layer prevents oxidation of the aluminum material, allowing the use of cost-effective aluminum while maintaining electrical stability and reliability over time by isolating the reactive metal from oxidative conditions
4Ease of manufacture
If the first base electrode covers both pad area and display area, then manufacturing process is simplified, but electrical interference increases
Solution Approach 1:
The first base electrode is segmented into separate regions corresponding to the pad area and display area. By forming the base electrode in distinct sections rather than as a continuous layer, the invention maintains manufacturing simplicity while reducing electrical interference between different functional zones through spatial separation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances electrical reliability and reduces signal distortion, as evidenced by stable resistance values over time, with a narrower variation range compared to comparative examples, ensuring consistent device performance.
Implementation Method 1
precise etching processes to ensure electrical connectivity and stability
Data Source
AI summary
A display device having a pad area and a display area is provided. The display device includes: a substrate; a pad structure on the substrate in the pad area; and a display element part on the substrate in the display area. The pad structure includes a first pad pattern, a second pad pattern on the first pad pattern, and a third pad pattern on the second pad pattern, and the display element part includes a light emitting element configured to emit light in a display direction. The second pad pattern has a first area and a second area, the second pad pattern and the third pad pattern do not contact each other in the first area, and the second pad pattern and the third pad pattern contact each other in the second area.