Stacked Conductive Lines Prevent Short Circuits in Display Routing
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Solution Overview
Problem
In display apparatuses, short circuits occur due to metal layers remaining as residual layers in grooves defined in insulating layers, particularly when the gap between conductive lines is between 0.25 micrometers and 0.75 micrometers, leading to reliability issues.
Innovation Solution
The conductive lines are designed to overlap each other by specific widths or be spaced apart by specific distances, ensuring that the gap between grooves in the insulating layer is within a range that prevents short circuits, thereby enhancing the reliability of the display apparatus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the gap between conductive lines is reduced to increase line density, then the area occupied by conductive lines decreases, but short circuits occur due to residual metal layers in grooves
Solution Approach 1:
The patent transitions from a two-dimensional planar arrangement of conductive lines to a three-dimensional stacked arrangement with multiple layers. By positioning conductive lines in different layers at different heights, the design achieves higher line density while maintaining sufficient spacing to prevent short circuits caused by residual metal layers in grooves.
Solution Approach 2:
The patent implements a nested structure where conductive lines are arranged in multiple stacked layers, with each layer containing conductive lines that are positioned relative to lines in adjacent layers. This nested multi-layer configuration allows compact routing while preventing harmful interactions between lines through the insulating layers separating them.
2Area of stationary object
If multiple conductive lines are stacked in the same region to reduce routing area, then the area for signal transmission decreases, but manufacturing precision requirements increase due to overlapping structures
Solution Approach 1:
The patent segments the routing space into multiple discrete layers, with each layer containing a subset of the conductive lines. This segmentation allows independent formation and alignment of lines in each layer, reducing the overall manufacturing precision requirements compared to forming all lines in a single layer, while still achieving compact routing.
Data Source
AI summary
A display apparatus includes a substrate including a display area and a non-display area disposed around the display area, a driving circuit disposed in the non-display area, a first conductive line extending in a first direction and disposed in the non-display area, a second conductive line extending in the first direction and disposed on the first conductive line, and a third conductive line extending in the first direction and disposed on the second conductive line, wherein the second conductive line overlaps the first conductive line by a first width or is spaced apart from the first conductive line by a first distance in a plan view, and the third conductive line overlaps the first conductive line by a second width or is spaced apart from the first conductive line by a second distance in the plan view.