Input-Sensing Electrode Routing With Bridge Patterns for Reliable Connections
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Solution Overview
Problem
Existing input-sensing units face challenges in maintaining process reliability and electric reliability due to increased integration density and number of signal lines, necessitating fine patterning processes that can be complex and prone to defects.
Innovation Solution
The input-sensing unit employs a design with first and second sensing electrodes arranged in different directions, interconnected by sensing lines and pads, and utilizes a double routing structure with bridge patterns to maintain sensitivity and reduce pad area, enhancing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the integration density of electronic components and signal lines is increased, then the functionality and performance of the input-sensing unit are improved, but the reliability decreases due to potential disconnection failures and patterning failures
Solution Approach 1:
The bridge pattern extends in a direction substantially perpendicular to the sensing line, creating a two-dimensional coverage area that increases the overlap region between the bridge pattern and the sensing line. This dimensional change ensures that even if the sensing line has slight positioning deviations, the electrical connection is maintained, thereby preventing disconnection failures while allowing high integration density.
Solution Approach 2:
The bridge pattern is designed with an extended structure that anticipates potential positioning errors or disruptions in the sensing line. By creating a larger overlap area beforehand, the design compensates for possible manufacturing variations or line disruptions, ensuring continuous electrical connection and preventing disconnection failures before they can occur.
2Quantity of substance
If the number of signal lines is increased, then the sensing capability is improved, but the manufacturing complexity increases requiring fine patterning processes
Solution Approach 1:
The bridge pattern extends beyond the minimum required length to connect two adjacent sensing lines, creating an excessive overlap area. This partial extension in one direction (perpendicular to the sensing line) compensates for not needing to create complex interlacing patterns, thereby simplifying the overall patterning process while maintaining multiple signal line connections.
3Quantity of substance
If the number of pads is increased to accommodate more signal lines, then the connection capacity is improved, but the device area increases
Solution Approach 1:
The bridge pattern merges the connection function between multiple sensing lines into a single structural element. By extending the bridge pattern perpendicular to the sensing line to overlap with multiple lines, it consolidates what would otherwise require multiple separate pads and connection points, thereby maintaining high connection capacity while minimizing the increase in device area.
Data Source
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Figure 2A
AI summary
An input-sensing unit includes first sensing electrodes, second sensing electrodes, first sensing lines, second sensing lines, third sensing lines, and bridge patterns. The second sensing electrodes are electrically insulated from the first sensing electrodes. The first sensing lines are respectively connected to the first sensing electrodes. The second sensing lines are respectively connected to first ends of the second sensing electrodes. The third sensing lines are respectively connected to second ends of the second sensing electrodes. The second ends oppose the first ends. The bridge patterns are respectively connected to the third sensing lines. The bridge patterns are closer to the first ends than to the second ends. The bridge patterns extend in a direction parallel to the third sensing lines.