Multi-Layer Display Pad Structure for Stable Signal Integrity
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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 of the substrate, where existing technologies struggle to maintain signal integrity over time.
Innovation Solution
The display device incorporates a specific pad structure with multiple layers and patterns, including a first, second, and third pad pattern, along with a light emitting element and electrodes, where the second and third pad patterns do not contact each other in certain areas but overlap in others, and a method of manufacturing that involves etching processes to form these patterns and electrodes, ensuring electrical stability and minimizing signal distortion.
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 due to resistance variations over time
Solution Approach 1:
The pad structure is divided into multiple layers (first pad layer, second pad layer, third pad layer) with each layer serving specific functions. The first pad layer provides electrical connection, the second pad layer provides mechanical support and stress relief, and the third pad layer provides additional electrical connection. This segmentation allows each layer to be optimized for its specific function, improving overall electrical reliability while managing complexity through functional division.
Solution Approach 2:
The patent implements a nested multi-layer pad structure where the first, second, and third pad layers are stacked vertically on top of each other, with each layer nested within the overall pad structure. This nesting approach allows multiple functional elements to be integrated in a compact vertical arrangement, improving electrical reliability through multiple connection paths while containing the complexity within a unified structural framework.
2Reliability
If pad patterns are continuously contacted to ensure electrical connection, then electrical conductivity is maintained, but signal distortion increases due to resistance variations over time
Solution Approach 1:
The patent applies different materials and properties to different regions of the pad structure. The first pad layer uses a material optimized for electrical conductivity, the second pad layer uses a material optimized for mechanical stability and stress distribution, and the third pad layer uses a material optimized for electrical connection. This local differentiation of properties allows each region to contribute optimally to signal stability while minimizing resistance variations that cause distortion.
Solution Approach 2:
The pad structure employs composite construction with multiple materials having different properties. The combination of conductive materials in the first and third pad layers with a mechanically stable material in the second pad layer creates a composite structure that simultaneously optimizes electrical conductivity and mechanical stability. This composite approach reduces resistance variations over time, thereby minimizing signal distortion while maintaining stable electrical connection.
3Manufacturing precision
If multiple etching processes are used to form precise pad patterns, then manufacturing precision is improved, but the manufacturing complexity and time increase
Solution Approach 1:
The patent employs preliminary patterning actions where photoresist layers are applied and patterned before each etching process. The first photoresist layer is patterned to define the first pad pattern, the second photoresist layer is patterned to define the second pad pattern, and the third photoresist layer is patterned to define the third pad pattern. These preliminary patterning actions enable precise control of each pad layer's geometry, achieving high manufacturing precision while organizing the complex multi-step process into a systematic sequence that can be efficiently executed.
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, maintaining low resistance variations over time, thereby ensuring the stability and efficiency of the display device's electrical performance.
Implementation Method 1
an etching process may be performed on the first base electrode
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.