Broken Data Line Repair in Active Matrix Displays
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Solution Overview
Problem
In the production of active matrix display devices, broken data lines pose a significant challenge due to low repair success rates and high resistance-capacitance loading, which affects product yield and performance.
Innovation Solution
A method involving laser-welding and laser-cutting techniques is employed to repair broken data lines by forming conductive connections between the data lines and a repair line in the peripheral areas of the array substrate, reducing coupling and increasing the utilization of the repair line, while strategically placing laser welding and cutting points to minimize resistance-capacitance loading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If laser welding is performed to repair broken data lines, then repair success rate is improved, but resistance-capacitance loading increases
Solution Approach 1:
The array substrate is divided into active area and peripheral area, with the repair line confined to the peripheral area. This segmentation isolates the repair operations from the active display region, reducing capacitive coupling and resistance loading on functional data lines while maintaining repair effectiveness.
Solution Approach 2:
The repair line is designed with specific local characteristics: it extends only in the peripheral area, intersects broken data lines at optimized positions, and is disconnected near intersection points. These local quality adjustments minimize resistance-capacitance loading while ensuring reliable repair connections where needed.
2Productivity
If repair line is extended to intersect multiple broken data lines, then repair efficiency is improved, but coupling between repair line and data lines increases
Solution Approach 1:
The repair line is pre-configured in the peripheral area to extend and intersect with multiple broken data lines before any repair operation. This preliminary arrangement allows efficient repair of multiple lines while the line is disconnected near intersection points to minimize coupling, and coupling is reduced by confining the repair line to the peripheral area away from the active display region.
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 approach achieves a high repair success rate with reduced resistance-capacitance loading, ensuring product stability and enabling the repair line to be used for multiple broken data lines, thereby improving overall device performance.
Implementation Method 1
performing laser-welding on intersection position between the broken data line and the repair line in the top peripheral area
Implementation Method 2
forming, by disconnecting the repair line near the intersection position in the top peripheral area, a repair section
Data Source
AI summary
The present disclosure relates to the field of display technology, and provides a method for repairing broken line, an array substrate, and an active matrix display device. The method for repairing broken line comprises: providing an array substrate including a data driving circuit disposed in the bottom peripheral area, a plurality of data lines derived from the data driving circuit and extending to the top peripheral area through the active area, a repair line derived from the data driving circuit and extending along the side peripheral area and the top peripheral area, detecting each of the data lines of the array substrate to determine a broken data line including a first section and a second section disconnected with each other; performing laser-welding on an laser intersection position between the broken data line and the repair line in the top peripheral area to weld the broken data line and the repair line; forming, by disconnecting the repair line near the intersection position in the top peripheral area, a repair section which is extending from the data driving circuit to be conductive connected with the second section, and signals are introduced to two disconnected sections of the broken data line from the data driving circuit, and the data driving circuit and the repair section, respectively. The present disclosure can achieve a high repair success rate of the broken data line and a small resistance-capacity loading after repairing.