LCD Repair Circuit Layer Separation Parasitic Capacitance
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Solution Overview
Problem
Conventional liquid crystal display (LCD) array substrates face issues with line defects due to broken data lines, where repair lines in the same layer cause parasitic capacitance and increased resistance, affecting signal transmission quality.
Innovation Solution
The repair circuit positions repair lines in different layers and partially on a separate printed circuit board, using high conductivity materials like copper to reduce parasitic capacitance and resistance, with repair lines placed beneath the adhesive sealing to minimize interference with the transparent common electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If repair lines are positioned in the same layer, then the repair structure is simple and easy to manufacture, but parasitic capacitance increases and signal transmission quality deteriorates
Solution Approach 1:
The patent transitions from a two-dimensional planar arrangement to a three-dimensional stacked arrangement by positioning repair lines in different layers (first repair line in one layer, second repair line in another layer). This vertical separation reduces parasitic capacitance between repair lines while maintaining manufacturing feasibility through standard multi-layer PCB techniques.
2Ease of manufacture
If repair lines are made with standard materials, then manufacturing is straightforward, but resistance increases and signal transmission quality decreases
Solution Approach 1:
The patent employs a composite material strategy by combining standard PCB materials for the substrate with high-conductivity materials (such as copper or copper alloys) specifically for the repair line conductors. This hybrid approach maintains ease of manufacture using conventional PCB processes while achieving low resistance and high signal transmission quality through superior conductive materials.
3Area of stationary object
If repair lines are placed outside the display region, then the display area is maximized, but the repair lines may interfere with the transparent common electrode
Solution Approach 1:
The patent resolves the spatial conflict by moving the repair lines from the same plane as the transparent common electrode to different vertical layers. The first and second repair lines are positioned in layers above or below the transparent common electrode, allowing maximum display area in the planar view while eliminating electromagnetic interference through vertical separation.
Data Source
AI summary
A liquid crystal display having a repair circuit structure and an array substrate of the liquid crystal display are provided. Each of the repair lines of the repair circuit comprises a front repair line portion arranged to cross with a front data line portion in a substantially perpendicular manner, an end repair line portion arranged to cross with an end data line portion in a substantially perpendicular manner, and an intermediate repair line portion connecting the front and end repair line portions. At least two repair lines in the end repair line portion are positioned in different layers so that a parasitic capacitance between respective repair lines in the repair circuit structure can be reduced and signal transmission quality can be ensured.