Active Matrix Substrate Signal Line Pitch Optimization
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Solution Overview
Problem
The concentration of signal lines in the non-display region of active matrix substrates leads to an increased area where the signal lines are routed, especially when connectors are used to change from first wiring layers to second wiring layers, which complicates the layout and increases the size of the non-display region.
Innovation Solution
The pitch between second connectors in the non-display region is greater than that of first connectors, allowing for a more concentrated arrangement of signal lines and reducing the area where they are routed by adjusting the angles and pitches of the signal lines and connectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If connectors are provided in the non-display region to change signal lines from first wiring layers to second wiring layers, then the signal lines can be routed with different materials optimized for different regions, but the area where signal lines are routed increases
Solution Approach 1:
The patent changes the pitch parameter between connectors to optimize the layout. Specifically, the pitch between first connectors is set to be greater than the pitch between second connectors, which allows signal lines to be more concentrated in certain regions while still providing material transition functionality. This parameter optimization reduces the overall area occupied in the non-display region.
2Reliability
If connectors are provided to change from first wiring layers to second wiring layers, then material optimization is achieved, but the layout complexity increases
Solution Approach 1:
The patent applies different pitch values to different groups of connectors based on their local requirements. First connectors have a greater pitch while second connectors have a smaller pitch, allowing each group to be optimized for its specific function. This local differentiation reduces overall layout complexity compared to a uniform design.
Solution Approach 2:
The patent introduces asymmetric pitch values between different connector groups. The pitch between first connectors is intentionally made greater than the pitch between second connectors, creating an asymmetric layout that optimizes both space utilization and signal line concentration while maintaining the necessary material transition functionality.
3Area of stationary object
If signal lines are concentrated in the non-display region, then the routing area is reduced, but the concentration leads to increased area when connectors are added
Solution Approach 1:
By optimizing the pitch parameter between connectors, the patent achieves better signal line concentration. The differentiated pitch values allow signal lines to follow more compact paths while transitioning between wiring layers, thereby reducing the overall routing area in the non-display region.
Data Source
AI summary
An active matrix substrate includes: a display region; a non-display region around the display region; a mounting region of the non-display region; a plurality of first signal lines provided in the non-display region to extend from near the display region to the mounting region, partially spaced at a pitch Pa, partially spaced at a pitch Pb, and partially inclined at an angle θa; and a plurality of second signal lines provided in the non-display region to extend from near the display region to the mounting region, partially spaced at the pitch Pa, partially spaced at the pitch Pb, partially inclined at the angle θa, and partially inclined at an angle θb. The pitch Pd between each adjacent pair of a plurality of second connectors of the second signal lines is greater than the pitch Pc between each adjacent pair of a plurality of first connectors of the first connectors.