Array Substrate Repair via Common Electrode Line Segments
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Solution Overview
Problem
In liquid crystal display panels, broken gate or data lines can render entire rows or columns of pixels non-functional, reducing display panel yield due to the lack of individual gates for thin film transistors and direct connections to gate and data lines.
Innovation Solution
A repairing method for array substrates involves disconnecting and reconnecting thin film transistors to broken gate or data lines using soldering and laser cutting techniques, and utilizing common electrode lines as repair lines to restore functionality by creating patches and connections that bypass breakpoints, ensuring electrical continuity across pixel regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If gate lines and data lines are directly connected to multiple TFTs without individual gates, then device complexity is reduced and manufacturing is simplified, but reliability deteriorates because broken lines cause multiple pixels to fail
Solution Approach 1:
The patent introduces individual gate electrodes for TFTs located between breakpoint positions, segmenting the gate control function. This allows isolated control of specific TFTs whose data lines are broken, preventing cascade failures across entire rows or columns. The segmentation principle resolves the contradiction by maintaining the simplified shared gate structure for most TFTs while adding localized individual gates only where needed to restore reliability.
Solution Approach 2:
The patent uses repair lines as intermediary conductive paths to bypass broken gate lines or data lines. These repair lines connect TFTs to their intended electrodes through alternative routes, mediating the electrical connection when original lines are broken. This intermediary approach restores functionality without requiring complete redesign of the original line structure.
2Productivity
If broken gate or data lines are not repaired, then manufacturing process is simpler and faster, but productivity deteriorates due to reduced display panel yield
Solution Approach 1:
The patent performs repair operations after the array substrate is formed but before final assembly, utilizing the existing TFT structure and electrode layouts. The repair process activates previously formed but unused conductive paths (repair lines) and establishes new connections without requiring complete disassembly or re-manufacturing of the panel. This preliminary repair action recovers yield without adding extensive manufacturing complexity.
Solution Approach 2:
The patent recovers functionality of broken lines by utilizing redundant repair lines that were formed during manufacturing but not activated. Instead of discarding panels with broken lines, the method activates alternative conductive paths to recover the electrical connections, transforming defective products into functional display panels and improving overall yield.
3Reliability
If individual gate electrodes are added to TFTs between breakpoints, then reliability is improved by isolating failures, but device complexity increases
Solution Approach 1:
The patent applies individual gate electrodes only to specific TFTs located between breakpoint positions on gate lines, rather than to all TFTs in the display panel. This local quality approach adds complexity only where necessary to achieve failure isolation, while maintaining the simpler shared gate structure for the majority of TFTs. The selective application resolves the contradiction by balancing reliability improvement with minimal complexity increase.
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 method effectively restores functionality to affected pixel regions, reducing the number of non-functional pixels and improving display panel yield by allowing for the repair of broken lines without requiring extensive replacement of components.
Implementation Method 1
a first scribe line Q1 is formed to separate a source 15a of a first thin film transistor 151 from a data line 121
Implementation Method 2
the first portion 111 and a drain 15b of the first thin film transistor 151 are soldered with each other through an overlapping region between the gate line 611 and the drain 15b
Data Source
AI summary
A repairing method for an array substrate is provided. The array substrate includes at least one defective signal line, which is a data line or a gate line having a breakpoint. The defective signal line is divided by the breakpoint into a first portion and a second portion. The repairing method includes disconnecting a connection between a first thin film transistor and a data line or a gate line to which the first thin film transistor is connected, the first thin film transistor being a thin film transistor closest to the breakpoint among thin film transistors connected to the first portion; electrically connecting a first terminal of the first thin film transistor to the first portion; and taking a common electrode line segment from a common electrode line to which the first pixel electrode corresponds as a repair line.