Display Pad Layout With Insulating Pattern for Short-Circuit Prevention
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Solution Overview
Problem
Display devices face challenges in preventing short-circuit defects and damage to electrode lines in the pad area, which affects the reliability and efficiency of the display.
Innovation Solution
The display device incorporates a design with a pad area featuring a matrix arrangement of pad lines, connection electrodes, and isolation electrodes, where the first and second pad lines are electrically connected, and the connection and isolation electrodes are patterned in the same process, with an insulating layer covering the pad lines to prevent short circuits and enhance electrical signal reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pad lines are arranged in a matrix form with close spacing to increase connection density, then productivity and electrical connectivity are improved, but the risk of short-circuit defects and electrode line damage increases
Solution Approach 1:
The pad structure is segmented into multiple functional regions: first contact areas for electrical connection, second contact areas for electrode connection, and isolation regions with insulating patterns. This segmentation allows dense pad arrangement while maintaining electrical isolation between adjacent pads, preventing short-circuit defects even when pads are closely spaced in matrix form
Solution Approach 2:
An insulating pattern is introduced as an intermediary element between adjacent pad lines and electrode parts. This insulating layer acts as a mediator that enables high-density pad arrangement while maintaining electrical isolation, thus improving connection density without compromising reliability
2Device complexity
If electrode parts are positioned to overlap pad lines for compact design, then device complexity is reduced, but damage to electrode lines and short-circuit risks increase
Solution Approach 1:
The insulating pattern is selectively applied only in regions where electrode parts overlap or approach pad lines. This localized insulation provides protection exactly where needed - in the overlap regions - while maintaining the overall compact design. The insulating pattern covers the pad line in the first contact area and extends to protect against electrode damage without adding excessive complexity
3Reliability
If multiple pad lines are electrically connected in contact areas to improve connectivity, then electrical signal reliability is enhanced, but the risk of short-circuit defects increases
Solution Approach 1:
The pad structure is divided into distinct first contact areas and second contact areas with different connection functions. The first contact area connects pad lines to each other, while the second contact area connects pad lines to electrode parts. This segmentation enables controlled electrical connections that improve signal reliability while managing structural complexity through functional zoning
Data Source
AI summary
A display device includes a display area and a pad area. The display device may include a pixel on a base layer in the display area, the pixel including a light emitting element, and pads on the base layer in the pad area. The pads may include pad lines including first and second pad lines and first and second electrode parts. The pads may include a first contact area and a second contact area. The first pad line and the second pad line may be electrically connected to each other in the first contact area. The second pad line and the second electrode part may be electrically connected in the second contact area. The first electrode part may overlap the second pad line in a plan view. The first and second electrode parts may be electrically separated from each other by a pad insulating pattern.