Stacked Signal Lines Reduce Resistance in Display Substrates
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Solution Overview
Problem
In liquid crystal display devices, signal lines directly formed on the display panel experience signal delay due to high line resistance, degrading display quality.
Innovation Solution
The display substrate incorporates a signal line part with a multiplex structure, featuring a first line and a second line that are insulated and stacked, reducing line resistance by forming a parallel connection through signal pads that connect to both lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If signal lines are formed directly on the display panel, then the device structure is simplified and manufacturing is easier, but line resistance increases causing signal delay
Solution Approach 1:
The patent transitions from planar signal line arrangement to a three-dimensional stacked configuration. First and second signal lines are arranged in different layers (different dimensions) and connected through vertical conductive structures, effectively reducing resistance without complicating the manufacturing process flow.
Solution Approach 2:
Multiple signal lines (first and second signal lines) are merged into a unified stacked structure with shared conductive connections. This combining approach reduces overall resistance by providing parallel conduction paths while maintaining integration with the display panel manufacturing process.
2Device complexity
If signal lines are formed directly on the display panel, then device complexity is reduced, but line resistance increases causing signal delay
Solution Approach 1:
The signal transmission path is extended into the vertical dimension with stacked signal lines at different layers. This three-dimensional arrangement reduces signal delay by providing shorter effective resistance paths without significantly increasing horizontal device complexity.
Solution Approach 2:
The signal line structure is segmented into multiple independent conductive layers (first signal line, second signal line) that can be formed through separate manufacturing steps. This segmentation allows optimization of each layer's resistance characteristics while maintaining overall structural manageability.
3Reliability
If stacked signal lines are formed in different layers, then line resistance is reduced, but device structure becomes more complex
Solution Approach 1:
The stacked signal line structure serves multiple functions simultaneously: it reduces resistance, provides signal isolation between layers, and integrates with existing display panel manufacturing processes. This multi-functionality justifies the increased structural complexity by delivering multiple performance benefits.
Solution Approach 2:
Conductive structures serving as intermediaries connect the first and second signal lines across different layers. These intermediary elements enable vertical electrical connection while maintaining structural organization, managing the complexity through standardized connection interfaces.
Data Source
AI summary
In a display substrate and a display device having the display substrate for reducing a line resistance, the display substrate includes a plurality of pixel parts, a signal line part and a signal pad part. The pixel parts are formed in a display area. The signal line part is formed in a peripheral area surrounding the display area. The signal line part includes a first line formed with a first conductive layer, and a second line formed with a second conductive layer over the first line. The second line overlaps the first line. The signal pad part includes a first pad integrally formed with the first line, and a second pad integrally formed with the second line, wherein an identical driving signal is applied to the first pad and the second pad. Accordingly, the line resistance of the signal line part may be reduced.