Array Substrate Repair Layout for Disconnected Display Signal Lines
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Solution Overview
Problem
The existing TFT-LCD array substrates face challenges in maintaining display performance and yield due to signal line disconnections, which are not efficiently addressed by current manufacturing processes.
Innovation Solution
The array substrate design includes a display region with signal lines and a non-display region featuring at least three repair lead wires and welding terminals, where the orthographic projections of the signal lines and repair lead wires form overlapping regions, allowing for laser fusion of disconnected signal lines without affecting normal display functions, and increasing the number of repairable signal lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If repair lead wires are extended to cover more signal lines, then the repair capability is improved, but the area occupied and complexity of arrangement increases
Solution Approach 1:
The repair lead wires are arranged in overlapping regions where their orthographic projections intersect with signal lines, utilizing vertical layering and spatial overlap rather than simple linear extension. This dimensional approach allows multiple repair lead wires to serve multiple signal lines without proportionally increasing the occupied area, as they share common spatial regions through overlapping configurations.
Solution Approach 2:
The overlapping regions enable repair lead wires to serve multiple functions simultaneously - each repair lead wire can repair multiple different signal lines by passing through overlapping regions where different signal lines are located. This multi-functionality increases repair capability without requiring separate dedicated repair lead wires for each signal line, thus avoiding proportional area increase.
2Productivity
If more repair lead wires are added to increase repairable signal lines, then the yield is improved, but the device complexity increases
Solution Approach 1:
Multiple repair lead wires are merged into overlapping regions where they share common spatial locations and serve common signal lines. Instead of having completely separate and independent repair paths for each signal line, the system combines multiple repair lead wires into shared overlapping regions, reducing the overall complexity of the repair network while maintaining the ability to repair multiple signal lines.
Solution Approach 2:
The overlapping regions are pre-configured during manufacturing to establish predetermined repair paths. The repair lead wires are arranged in advance to pass through specific overlapping regions that correspond to groups of signal lines, creating a pre-planned repair network that simplifies the repair process and reduces operational complexity while maximizing yield.
3Ease of repair
If repair lead wires are made longer to reach more signal lines, then the repair coverage is improved, but the probability of disconnection and short circuit increases
Solution Approach 1:
Instead of extending repair lead wires linearly across the entire display region, the invention utilizes overlapping regions where repair lead wires can access multiple signal lines by changing spatial dimensions and layers. This allows repair lead wires to reach more signal lines through vertical and lateral overlap rather than through excessive linear extension, reducing the length and vulnerability of the wires while maintaining comprehensive repair coverage.
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 design enhances the yield of display panels by enabling efficient repair of signal lines through overlapping regions, reducing the length and area occupied by repair lead wires, decreasing the probability of short circuits, and facilitating their arrangement, thus maintaining normal display functionality.
Implementation Method 1
allowing for laser fusion of disconnected signal lines
Data Source
AI summary
An array substrate, a display panel, and a display device. The array substrate includes a substrate having a display region and a non-display region surrounding the display region. The display region includes a plurality of signal lines extending along a first direction. The non-display region includes at least three repair lead wires, and welding terminals connected to the repair lead wires in a one-to-one corresponding manner. The signal lines form overlapping regions together with an orthographic projection of at least one repair lead wire on the substrate.