Array Substrate Layered Routing for Narrow Borders and Low Coupling
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Solution Overview
Problem
Display devices with reduced border width face challenges in maintaining display quality due to increased coupling capacitance from relocated signal lines in the display region.
Innovation Solution
An array substrate design featuring first and second signal lines of different conductive layers, with traces and switching elements arranged to minimize signal line crossings and coupling capacitance, allowing for a narrow border while maintaining display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If traces are moved from peripheral region to display region to reduce border width, then border width is reduced, but coupling capacitance between adjacent signal lines increases
Solution Approach 1:
The patent applies dimensionality change by transitioning from a planar arrangement to a three-dimensional stacked arrangement. Traces are routed in different conductive layers (first conductive layer) that are stacked above or below the signal lines (second conductive layer), thereby separating them in the vertical dimension. This spatial separation in the third dimension effectively reduces the coupling capacitance between adjacent signal lines while allowing traces to be positioned in the display region, thus achieving narrow border width without compromising display quality.
2Length of stationary object
If more signal lines are placed in display region to achieve narrow border, then border width is reduced, but display quality deteriorates due to increased coupling capacitance
Solution Approach 1:
The patent resolves this contradiction by utilizing the vertical dimension through multiple conductive layers. Signal lines are arranged in a second conductive layer while traces are routed in a first conductive layer stacked at different heights. This three-dimensional arrangement allows dense signal line placement in the display region for narrow borders while maintaining adequate electrical isolation between adjacent signal lines, thus preserving display quality.
Solution Approach 2:
The patent introduces insulating layers as intermediary elements between the first conductive layer (traces) and the second conductive layer (signal lines). These insulating layers act as mediators that provide electrical isolation and reduce coupling capacitance between adjacent signal lines, enabling the system to achieve both narrow border width and high display quality simultaneously.
Data Source
AI summary
An array substrate includes a substrate, a plurality of first signal lines, a plurality of traces, a plurality of second signal lines, and a plurality of switching elements. The first signal lines are disposed on the substrate along a first direction. The traces are disposed on the substrate along a second direction different from the first direction, and one trace is electrically connected to one first signal line and crosses another one first signal line. The second signal lines are disposed on the substrate along the second direction, the second signal lines cross the first signal lines, and the traces and the second signal lines are formed of different conductive layers. The switching elements are disposed on the substrate, and one of the switching elements is electrically connected to a corresponding one first signal line and a corresponding one second signal line.