Rod-Type LED Bridge Layout for Contact Reliability and Isolation
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Solution Overview
Problem
Rod-type light emitting diodes (LEDs) face contact failures due to short-circuiting and defects, which affect their durability and efficiency in display devices, especially under poor environmental conditions.
Innovation Solution
The implementation of an insulating pattern on the conductive bridge pattern, with specific positioning and electrical separation of contact electrodes, along with an insulating layer and void structure, to prevent short-circuiting and enhance contact reliability in rod-type LEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If rod-type LEDs are fabricated in small size for micro/nano scale display pixels, then the display resolution and device miniaturization are improved, but contact failures and short-circuiting defects increase
Solution Approach 1:
The contact structure is segmented into multiple components: conductive bridge pattern, insulating pattern, and contact electrode. This segmentation allows each component to perform its specific function - the bridge pattern provides conductive path, the insulating pattern prevents short-circuiting, and the contact electrode ensures reliable electrical connection, thereby solving the contact reliability issue in miniaturized LEDs
Solution Approach 2:
The insulating pattern acts as an intermediary element between the conductive bridge pattern and surrounding structures. It mediates the electrical connection by preventing unwanted short-circuiting while allowing the conductive bridge to maintain its electrical function, thus resolving the contradiction between miniaturization and contact reliability
2Area of stationary object
If contact electrodes are positioned closer to reduce spacing, then the device area is reduced, but short-circuiting between electrodes increases
Solution Approach 1:
The insulating pattern serves as an intermediary barrier positioned between contact electrodes and conductive structures. It allows electrodes to be positioned closer for area reduction while preventing short-circuiting by providing electrical isolation, thus resolving the contradiction between device area and short-circuiting prevention
Solution Approach 2:
The insulating pattern is strategically positioned only where needed - adjacent to the conductive bridge pattern and contact electrodes. This local application of insulating material provides targeted protection against short-circuiting without requiring complete insulation throughout the entire device, enabling area reduction while maintaining reliability
Data Source
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AI summary
A light emitting device may include: a substrate; a first electrode provided on the substrate, and a second electrode disposed on a plane identical with a plane of the first electrode at a position spaced apart from the first electrode; at least one light emitting element provided on the substrate, and including a first end and a second end with respect to a longitudinal direction; a bridge pattern provided on the light emitting element, and coupled to the second end of the light emitting element; a first contact electrode provided on the substrate, and coupling the first electrode with the first end of the light emitting element; and a second contact electrode provided on the substrate, and coupling the bridge pattern with the second electrode.