Active Device Array Substrate Repair via Cutting Block
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Solution Overview
Problem
High-definition TFT-LCD panels face manufacturing cost increases due to open defects in scan lines, which are typically considered defective, leading to a need for a method to repair such defects without affecting the aperture ratio.
Innovation Solution
The method involves using a cutting block from a neighboring common line as a repair line, electrically connected to active devices on either side of the open defect through welding, allowing the scan line to function normally without additional repair lines, thus maintaining the aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional TFT-LCD panels use standard scan line design without rescue lines, then aperture ratio is maintained, but open defects in scan lines cause panel rejection and increased manufacturing cost
Solution Approach 1:
The patent introduces a cutting block as an intermediary element that serves dual purposes: it maintains the original scan line structure for normal operation and simultaneously provides a repair pathway for open defects. The cutting block is positioned to connect with active devices on both sides of the defect, enabling signal routing around the defective scan line segment without requiring additional rescue lines that would reduce aperture ratio.
Solution Approach 2:
The patent changes the functional parameter of the common line by cutting it to create the cutting block. This parameter change transforms the common line from a continuous conductive path to a segmented structure where one segment (the cutting block) serves as a repair element. The cutting block can be selectively connected to active devices to bypass open defects in scan lines, thereby changing the electrical connectivity parameter to achieve repair functionality.
2Reliability
If rescue lines are added to repair scan line defects, then defect tolerance improves, but aperture ratio decreases due to additional line structures
Solution Approach 1:
The cutting block serves multiple functions: it acts as a normal common line segment during defect-free operation, and simultaneously serves as a repair pathway when open defects occur in scan lines. This multi-functionality eliminates the need for separate rescue lines, as the cutting block can be configured to provide both normal operation and defect repair functionality, thereby maintaining aperture ratio while improving defect tolerance.
Solution Approach 2:
The patent enables the common line structure to repair itself by creating a cutting block that can be connected to active devices to bypass defects. The existing common line infrastructure is repurposed to provide repair functionality, eliminating the need for external rescue line structures. The system uses its own existing elements (common lines and cutting blocks) to repair scan line defects, thereby avoiding additional structures that would reduce aperture ratio.
3Manufacturing precision
If open defects in scan lines lead to panel rejection, then manufacturing quality control is maintained, but production yield decreases and cost increases
Solution Approach 1:
The patent performs preliminary action by pre-configuring the cutting block structure during manufacturing, before defects occur. The cutting block is created from the common line and positioned to connect with active devices on both sides of potential scan line defects. This preliminary preparation enables rapid repair of open defects without requiring additional manufacturing steps or panel rejection, thereby maintaining quality control while improving production yield.
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 effectively enhances production yield and reduces manufacturing costs by enabling the repair of active device array substrates with open defects without compromising the aperture ratio.
Implementation Method 1
The cutting block, the scan line having the open defect, and two of the active devices located at two opposite sides of the open defect are welded
Data Source
AI summary
A repair method for repairing an active device array substrate is provided. The active device array substrate includes a substrate, scan lines, data lines, active devices, pixel electrodes, and common lines. At least one of the scan line has an open defect. The scan lines and the data lines are intersected to define sub-pixel regions. The active devices are electrically connected with the scan lines and the data lines correspondingly. Each pixel electrode is disposed in one of the sub-pixel regions and electrically connected with one of the active devices. The repair method includes cutting one of the common lines neighboring to the open defect to form a cutting block that is electrically insulated from the common lines; and welding the cutting block, the scan line having the open defect and two active devices located at two opposite sides of the open defect.