Display Pad Layout With Side-Wire Isolation Against Short Circuits
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Solution Overview
Problem
The existing display devices face issues with short-circuit failures between adjacent data pads due to side wires, which affect the reliability and performance of the display devices, especially in tiled configurations where image quality and connectivity are critical.
Innovation Solution
The proposed solution involves a specific design and manufacturing method for display devices where side wires connect front and rear data pads through strategically positioned openings and insulating layers, minimizing the risk of short-circuits by controlling the width and placement of residues and passivation layers, ensuring proper electrical connections without overlapping adjacent pads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If side wires are used to connect front and rear data pads, then electrical connectivity is achieved, but short-circuit failures occur between adjacent data pads
Solution Approach 1:
An insulating layer is introduced as an intermediary between adjacent data pads and side wires. This insulating layer prevents direct contact between conductive elements that would cause short circuits, while still allowing the side wires to establish electrical connectivity between front and rear data pads through designated openings in the insulating layer.
Solution Approach 2:
The connection structure is segmented into distinct functional zones: conductive regions for electrical connection, insulating regions for isolation, and opening regions for wire passage. This segmentation allows side wires to connect data pads while the insulating layer segments the conductive paths to prevent unintended connections between adjacent pads.
2Area of stationary object
If data pads are positioned close together to reduce area, then device area is reduced, but short-circuit risk increases
Solution Approach 1:
The insulating layer serves as a mediator that enables data pads to be positioned closely together without increasing short-circuit risk. By providing continuous electrical isolation between adjacent pads, the insulating layer allows minimal spacing between pads while maintaining reliability.
Solution Approach 2:
The insulating layer provides localized electrical isolation properties where needed between adjacent data pads, while allowing conductive properties in the opening regions where side wires need to make connections. This local differentiation of electrical properties enables both compact layout and reliable isolation.
Data Source
AI summary
A display device includes a substrate having first and second surfaces, transistors, data lines, and light-emitting diodes above the first surface, front data pads above the first surface, electrically connected to the data lines, and arranged in a first direction along a first side of the substrate, a first insulating layer above the front data pads, rear data pads under the second surface, and arranged in the first direction, a second insulating layer under the rear data pads, and defining first and second openings overlapping one of the rear data pads, a first virtual line extending from the first opening in the first direction not overlapping the second opening, and a side wire connecting a front data pad to a rear data pad, and electrically connected to and overlapping the first rear data pad through the first opening.