Thin Film Transistor Substrate Branch Repair Lines
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Solution Overview
Problem
Thin film transistor substrates face disconnection defects due to signal lines with small widths, leading to potential disconnection issues in liquid crystal displays.
Innovation Solution
Incorporation of branch repair lines and auxiliary repair lines connected via insulating layers and driving chips, allowing for local repair of signal lines and reducing the length of repair lines, thereby minimizing resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If signal lines with small widths are used to reduce pixel electrode size, then display resolution is improved, but disconnection defects occur more frequently
Solution Approach 1:
The patent divides the repair line into multiple segments (first repair line, second repair line, third repair line, fourth repair line) that can independently repair different signal lines. Each repair line segment is selectively connected to specific signal lines through switching elements, allowing targeted repair without affecting other lines. This segmentation enables precise repair of disconnected signal lines while maintaining the overall integrity of the display system.
Solution Approach 2:
The patent introduces switching elements (first switching element, second switching element, third switching element, fourth switching element) as intermediaries between the repair lines and signal lines. These switching elements act as mediators that can selectively connect or disconnect repair lines from signal lines based on detected defects. The switching elements enable controlled repair operations without causing unintended connections or interference with non-defective signal lines.
2Ease of repair
If a single long repair line is used to repair signal lines, then repair capability is provided, but resistance increases and repair efficiency decreases
Solution Approach 1:
The patent segments the repair function into multiple independent repair lines (first, second, third, fourth repair lines), each with its own switching element and connection path to signal lines. This segmentation creates shorter, lower-resistance repair paths compared to a single long repair line. Each repair line segment can operate independently, reducing the total resistance and improving repair efficiency while maintaining full repair capability across all signal lines.
Solution Approach 2:
The patent implements more repair lines than the minimum single repair line would provide, creating redundant repair paths. This excessive action ensures that even if some repair lines are occupied or have higher resistance, multiple lower-resistance paths are available for repair operations. The partial redundancy improves reliability and reduces effective resistance by providing alternative low-resistance routes for signal restoration.
3Adaptability or versatility
If repair lines cross multiple signal lines, then comprehensive repair coverage is achieved, but repair line length increases
Solution Approach 1:
The patent divides the repair coverage into multiple segmented repair lines, each responsible for specific signal lines or regions. Instead of one long repair line crossing all signal lines, multiple shorter repair line segments cover different areas. Each segment can be independently activated based on where disconnection defects occur, achieving comprehensive coverage while minimizing the length of any individual repair line and reducing overall resistance.
Solution Approach 2:
The patent applies local quality by making different repair lines have different characteristics and coverage areas optimized for their specific functions. Each repair line segment is tailored to repair specific signal lines or regions, rather than using a uniform long repair line for all purposes. This local optimization reduces repair line lengths in each region while maintaining comprehensive overall coverage through the combination of multiple specialized segments.
Data Source
AI summary
A thin film transistor substrate includes: first and second driving chips; a plurality of signal lines respectively connected to the first and second driving chips; a plurality of first and second branch repair lines extended across the plurality of signal lines connected to the first driving chip; a plurality of third and fourth branch repair lines extended across the plurality of signal lines connected to the second driving chip; an insulating layer between the plurality of first and second branch repair lines and the plurality of signal lines connected to the first driving chip, and between the plurality of third and fourth branch repair lines and the plurality of signal lines connected to the second driving chip; a first repair line connecting the first and second branch repair lines to each other; and a second repair line connecting the third and fourth branch repair lines to each other.