Conductive Polymer Wire Repair in TFT-LCD Substrates
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Solution Overview
Problem
Existing methods for repairing broken wires in TFT-LCD array substrates, such as laser chemical vapor deposition and laser welding, are costly and time-consuming, and can affect the performance of surrounding pixel units.
Innovation Solution
A method involving the formation of a conductive polymer precursor thin film between disconnected conductive points on a substrate, which is then polymerized using light to create an electrical connection, eliminating the need for expensive equipment and minimizing impact on nearby pixel units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If laser chemical vapor deposition or laser welding is used to repair broken wires, then the broken wire can be connected, but the repair cost increases and repair time increases
Solution Approach 1:
The patent replaces laser-based mechanical/thermal repair systems with a photochemical polymerization system. Instead of using high-energy laser beams to melt or deposit materials, the invention uses UV light to initiate polymerization of conductive polymer precursors, achieving wire connection through chemical bonding rather than thermal or mechanical processes.
Solution Approach 2:
The patent changes the energy parameter from high-energy laser radiation to lower-energy UV light polymerization. By changing the activation method from thermal/mechanical to photochemical, the repair process achieves the same connection reliability with reduced energy input, shorter processing time, and lower equipment requirements.
2Reliability
If laser chemical vapor deposition or laser welding is used to repair broken wires, then the broken wire can be connected, but the equipment cost increases
Solution Approach 1:
The patent replaces complex laser-based repair equipment with simpler photochemical processing equipment. The laser chemical vapor deposition and laser welding systems require sophisticated laser generators, precision positioning systems, and controlled atmospheres, whereas the polymerization method only requires UV light sources and precursor material deposition capabilities.
Solution Approach 2:
The patent uses inexpensive conductive polymer precursor materials that can be deposited as thin films and then activated by UV light. These precursor materials are cheaper than the consumables required for laser-based methods, and the process eliminates the need for expensive laser equipment while achieving reliable wire connections.
3Reliability
If laser chemical vapor deposition or laser welding is used to repair broken wires, then the broken wire can be connected, but the performance of surrounding pixel units is affected
Solution Approach 1:
The patent applies local quality by confining the polymerization reaction to only the region where UV light is applied. The conductive polymer precursor is deposited throughout the area, but polymerization occurs only in the irradiated zone, creating a localized conductive path that connects the broken wire without affecting surrounding regions. This localized action prevents thermal or mechanical damage to adjacent pixel units.
Solution Approach 2:
The patent replaces the high-energy laser field with a localized UV photochemical field. The UV light can be precisely directed to only the broken wire region, initiating polymerization locally without generating the thermal spread or mechanical stress that would affect surrounding pixel units. This substitution of energy type enables precise spatial control of the repair process.
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 quickly and cost-effectively repairs broken wires by forming a conductive polymer connection between conductive points, reducing repair time and preserving the performance of adjacent pixel units.
Implementation Method 1
performing a polymerizing process on the conductive polymer precursor thin film to form a conductive polymer electrically connecting the first conductive point and the second conductive point
Data Source
AI summary
A method for repairing a broken wire, a substrate and a display device are provided. The method is adopted for electrically connecting a first conductive point and a second conductive point separated from each other on a substrate. The method includes: forming a conductive polymer precursor thin film to physically connect the first conductive point and the second conductive point; and performing a polymerizing process on the conductive polymer precursor thin film to form a conductive polymer electrically connecting the first conductive point and the second conductive point.