Bent Electrode Layout for Aligning Subminiature LEDs in Displays
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Solution Overview
Problem
Challenges exist in aligning and connecting nanoscale subminiature light emitting elements with electrodes, particularly in display devices, due to difficulties in standing the elements vertically on the electrodes.
Innovation Solution
A display device design featuring first and second power lines with connection electrodes and electrodes extending in different directions, including bent portions, allows for improved alignment and connection of nanoscale light emitting elements, which are connected in series and parallel configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If nanoscale subminiature light emitting elements are used, then device miniaturization and integration density are improved, but alignment and connection with electrodes becomes difficult
Solution Approach 1:
The patent transitions from vertical standing connection to horizontal planar connection by introducing bent portions in the electrodes. The electrodes extend in a first direction and bend to connect with light emitting elements in a second direction, effectively using dimensional transformation to solve the alignment difficulty of nanoscale elements.
Solution Approach 2:
The patent introduces bent portions with curved shapes (circular arcs, zigzag patterns) in the electrodes to improve alignment. The curved geometry allows the electrodes to flexibly connect with light emitting elements positioned in different directions, making alignment significantly easier compared to straight electrodes.
2Reliability
If light emitting elements are connected vertically to electrodes, then connection reliability is improved, but alignment difficulty increases for nanoscale elements
Solution Approach 1:
The patent changes the connection orientation from vertical (perpendicular to substrate) to horizontal (parallel to substrate) by using bent electrodes. This dimensional change maintains electrical connection reliability while dramatically improving alignment ease for nanoscale light emitting elements.
Solution Approach 2:
The bent portions act as intermediary structures between the straight electrode segments and the light emitting elements. These bent portions provide flexible connection points that facilitate alignment while maintaining reliable electrical contact.
3Ease of manufacture
If straight electrodes are used for connection, then fabrication simplicity is improved, but alignment flexibility deteriorates
Solution Approach 1:
The electrode is segmented into multiple sections: straight segments for electrical connection and bent portions for alignment. This segmentation allows each part to perform its specific function optimally - straight segments maintain fabrication simplicity while bent portions provide alignment flexibility.
Solution Approach 2:
The bent portions with various curved geometries (circular arcs, zigzags) provide alignment flexibility without significantly complicating the fabrication process. The curved shapes can be easily formed using standard photolithography and etching techniques.
Data Source
AI summary
A display device includes: a first power line configured to transmit a first power supply; a second power line configured to transmit a second power supply; a first connection electrode extending in a first direction and electrically connected to the first power line; a second connection electrode spaced apart from the first connection electrode and electrically connected to the second power line; a first electrode extending from the first connection electrode; a second electrode extending from the second connection electrode and parallel to the first electrode with a distance therebetween; and a plurality of light emitting elements. Each of the plurality of light emitting elements has a first end electrically connected to the first electrode and a second end electrically connected to the second electrode, and each of the first electrode and the second electrode has a bent portion.